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Asbestos electrical insulation:
History, manufacture, visual identification: how to recognize asbestos-based or asbestos containing electrical insulation materials in products & buildings - a visual guide to identifying asbestos in buildings.
Page top photograph: asbestos insulation on electrical wiring in a theater.
This articles series about the manufacture & use of asbestos-containing products includes detailed information on the production methods, asbestos content, and the identity and use of asbestos-containing materials. Page top photo shows asbestos used in an electrical motor.
One of the major uses for asbestos paper as well as for
such forms of asbestos as yarn, tape, lap, and loose fiber is
in the field of electrical insulation. Asbestos was used in both higher voltage AC or DC electrical wiring as well as in low voltage wiring products such as telephone cabling.
[Click to enlarge any image]
The main reasons for
the use of asbestos are its fire and heat resistance,
electrical insulation properties, acid resistance, and durability. Electrical insulation is also used to protect the surfaces
of conductors from such adverse conditions as moisture
and chemicals, and to fill spaces where corona discharge
is liable to occur.
In electrical applications, asbestos insulation is used with
low iron content. All grades of crude and milled chrysotile
fiber are predominately used.
The lowest iron content fibers
for use in the electrical field are available from ore deposits
in the North American Continent. ASTM specifications list
the total iron content for electrical grade products. Details are
at ASBESTOS IRON CONTENT.
List of products using asbestos electrical insulation
Large quantities of asbestos are used to cover electrical
wire in the traction type of electric motors and coils where
there is a possibility of rising temperature damaging ordinary
The general use of asbestos electrical
insulation includes ordnance equipment (aircraft, missiles,
etc.) oil burners, heating and cooking apparatus, lighting
equipment, agricultural machinery, construction and mining
machinery, hoists, oil field machinery, machine tools, portable
tools, bakery machinery, food products 'machinery,
textile machinery, paper industry equipment, pumps and
compressors, conveying equipment, blowers and fans, trucks
and tractors, industrial ovens and furnaces, mechanical
stokers, computers and cash registers, vending machines,
laundry equipment, vacuum cleaners and units, refrigeration
and air conditioning units, motors and generators,
power transformers, switchgear controls, welding units, insulated
wire and cable, lamps, radio, TV and radar units,
x-ray units, railroad units, dental units, and signs and
Lightweight asbestos insulation is of primary importance
on Naval and Maritime ships. Navy cable insulation is of
particular importance; it is a combination of asbestos paper
and textile products (lap, tape, etc.)
In the manufacture of multi-conductor cables, the single
or paired conductors are cabled into required multiples, together
with cushioning fillers in the valleys. These fillers are
generally made with asbestos roving.
Specifications for Asbestos-Based Electrical Insulation Materials
Classification of electrical insulation by the American
Institute of Electrical Engineers (AIEE) follows:
Classes of Electrical Insulation Materials
Organic, not impregnated
Inorganic, organic binder
Inorganic, silicone binder
Notes: Watch out: This data is circa 1959 from AIEE and is not current; therefore the table is provided for historic reasons and not as a current standard for electrical insulation products.
Another classification which includes asbestos-electrical
insulated products is given by the Underwriter's Laboratories,
Inc. This laboratory classifies asbestos electrical
insulating material as asbestos-insulated wire (460 12) and
as asbestos-varnished cloth wire (460 13).
Type AA, with an asbestos braid and asbestos insulation
Type Al, with impregnated asbestos insulation
Type AlA, with asbestos braid and impregnated asbestos
Asbestos-Varnished Cloth Wire (460 13)
Type AVA, An asbestos braid: an insulation consisting of
varnished cloth and impregnated asbestos.
Type AVB, A plain [flame?] -retardent cotton braid: an insulation
consisting of varnished cloth and impregnated asbestos.
Type ABL, A lead covering: an insulation consisting of
varnished cloth and impregnated asbestos.
Watch out: by visual inspection I don't think we can distinguish cloth, non-asbestos wiring insulation of this age from Type AVB, A plain [flame?] -retardent cotton braid: an insulation
consisting of varnished cloth and impregnated asbestos. The wire shown above is discussed at OLD ELECTRICAL WIRING TYPES
Data pertaining to electric shipboard cable which includes
asbestos is given in the "Cable Comparison Guide," NAV-
SHIPS 250-660-23 (1956) published by Bureau of Ships,
Navy Department, Washington 25, D. C. and available
through Government Printing Office.
The data pertains
to Government procurement specifications MIL-C-915A
(Ships), MIL-C-2194B (Navy), MIL-C-2681 (Ships), and
MIL-W-16878B (Navy). All cables are identified by types.
The letters listed under types identify the first letters of the
words used in describing the cable. Other letters identify
construction of the cable. Some of these cables which incorporate
asbestos are identified as follows:
DFPA, Double conductor, flame proof, armored: Natural
rubber of asbestos-varnished cambric-asbestos insulation
depending on size, cabled with fillers, belt, armored.
DHFA, Double conductor, heat and flame resistant, armored:
Size 3, 4 and 9 with synthetic resin and felted asbestos
insulation; sizes 14 and larger with asbestos-varnished
cambric-asbestos insulation, cabled with fillers, belt, impervious
DHFTA, Double conductor, heat and flame resistant,
thin wall, armored: Thin wall synthetic and felted asbestos
insulation, cabled with fillers, binder, impervious sheath,
FHFTA, Four conductor, heat and flame resistant, thin
wall, armored: Thin wall synthetic and felted asbestos, insulation,
cabled with fillers, binder, impervious sheath,
Asbestos papers are very popular for use in the manufacture
of miniature electrical component units. Miniature
transformers can use asbestos papers. A 30 per cent reduction
in weight has been obtained in Class-B transformers. I [DF] have also found asbestos-paper insulated electrical wire inside of some older electrical appliances such as stove tops and toasters though more often we found braided asbestos cloth insulated wire in those locations.
World War II initiated many development projects specifically
for developing inorganic paper products. Prior to
1940, no inorganic papers were commercially available. At
present, there are four basically different types of inorganic
papers commercially available; i.e., asbestos, mica, glass,
and ceramic. Asbestos papers are manufactured by Johns-
Manville, Inc. under the trade name "Quinterra" or "Quinorgo";
by Raybestos-Manhattan, Inc. under the trade name
"Novabestos"; and by General Electric Co. under the trade
These basic paper products are available
in many different forms which include combinations of
asbestos-glass, asbestos-mica, papers backed with or sandwiched
between other types of papers or fabrics and held
together by an oleoresinous varnish, shellac, silicone, rubber,
or other composite insulation structures. These combinations
provide for increased tensile strength which is desirable
in many of the cable or wire taping operations.
The chief function of asbestos [in electrical applications] is that of a separator or as
a wrapping for wire insulation. Untreated paper is roughly
equivalent to air as an insulator; when it is completely dry
its resistivity is good.
Untreated paper can contain moisture
since it has the characteristic of absorbing moisture from the
air—a characteristic typical of other paper products. It is
usually treated with a varnish or lacquer in order to eliminate
the moisture problem. Where high temperature requirements
are of prime interest, the paper is treated with
silicone varnishes or fluorocarbons.
In the manufacture of asbestos paper, there is always
continued interest and development in producing open asbestos
fibers. Various methods of manufacture and various
equipment are used in order to fiberize bundles of asbestos
fiber. By opening the fibers, entrapped undesirable magnetite
can be removed.
Manufacturing processes have also
been developed which permit uniform blending of asbestos
fiber with such synthetic fibers as glass. These types of
products are used by electrical insulation manufactures and
by the manufacturers of reinforced plastics and filters.
"Quinterra" is a pyrolysis-resistant electrical insulation
made of highly purified asbestos. These electrical insulations
greatly extend the life of electrical equipment. By permitting
magnetic units to operate at higher temperatures, they
promote savings in space, weight and materials.
The asbestos products enable electrical apparatus to withstand
higher overloads; thus, they reduce the necessity for standby
equipment. Their thin layers require less time and labor to
apply and occupy less space than the extra thicknesses formerly
employed to compensate for the loss of dielectric
strength caused by heat.
(Courtesy Johns-Manville Corp.)
Figure 6.1. Installation of Quinterra wrapped coils in electric motor
armatur e[click to enlarge]
In transformers, their uses include barriers, core tubes,
spacer sticks, end packings, interlaminates, interlayers, and
wrappers. They have replaced metal cores in some resistors
and conserve insulation in others.
In magnets, they insulate
the ribbon coils, and form liners, spacers, and wrappers.
Both wires and cables are wrapped with "Quinterra" and
"Quinorgo" Typical motor wire insulation is shown in
Patent 2,626,213 describes a unique method of dispersing
and forming asbestos papers. The Novabestos paper products
produced are characterized by their ability to stretch
and distort, both dry and wet, to a much greater extent than
ordinary paper. The smooth asbestos fibers in the paper
allow more flow and better packing properties than the
commercial organic paper products.
The Novabestos paper machine developed specifically for
producing asbestos paper is similar in many respects to
the conventional Fourdrinier machine. The asbestos pulp is
picked up by a wire screen and carried over flat boxes operating
under a vacuum of 2 to 8 in. mm.
The flat boxes remove
60 to 70 per cent of the water from the slurry. The next step
in drying is a suction transfer roll operating under a vacuum
of 12 to 15 in. mm. In this operation, another 5 to 10 per
cent of water is removed. From the suction transfer roll, the
paper goes over a steam-jacketed drying roll and then over
a windup drum. The finished paper product has the appearance
of snowy white paper.
Reader Question: does this house wiring contain asbestos?
I was curious if I could post [this photo of old house wiring at an electric light fixture] in order to ID potential asbestos insulation.
The pictures are of a closet light fixture I was uninstalling. - M.C. 6 Feb 2016
Most likely those are conventional fabric (non-asbestos) insulated wires. Fabric covered (non-asbestos) electrical wire that was black or silver was often comprised of asphalt-impregnated cloth on both the wire jacket and the wires themselves, with the wire insulation made of fabric-covered rubber. Do you also have photos of the markings on the wire's outer jacket?
The asbestos-based electrical wire insulation I've seen appeared as white or gray fabric (theater wiring such as is shown at the top of this page) or in a harder asbestos-impregnated plastic or rubber insulation on wires used in high temperature appliances such as toasters, range tops, ovens, clothes dryers.
Watch out: however as you'll read in the article above there was asbestos-cloth insulated wire of several types, and more-difficult to distinguish by eye alone is asbestos-impregnated cotton fiber wire insulation.
The amount of debris removed by trimming the wire is probably trivial in any event.
Reader Question: did house wiring ever contain asbestos?
I was wondering if house wiring ever contained asbestos. The wiring in my home appears to have an asphalt impregnated type covering almost looks like a snake skin. Could this contain asbestos? - D.T., Canada 10/4/2013
A competent onsite inspection by an expert usually finds additional clues that would permit a more accurate, complete, and authoritative answer about wiring (noting any markings, exact composition of its insulation, and perhaps data about its age) than we can give by email alone. You will find additional depth and detail in articles at our website.
Asbestos was in particular, more widely used in a more pure form in certain electrical wires exposed to high risk (inside of heaters, toasters, electric stoves, theatre wiring).
I would like to see sharp photos of your wiring, its external jacket, cross section of the insulation, and if occasion permits, an actual sample - those details would permit further comment or even testing of the material.
Depending on the age and appearance of the wiring about which you ask, it may be appropriate to treat it as PACM - presumed asbestos containing material. But don't panic. Usually asbestos hazards are minimized by leaving PACM alone unless it is friable, already damaged and / or subject to damage and is in an occupied space.
I suspect that unless there is a demolition project in progress, the asbestos exposure hazard from asbestos-containing residential electrical wiring is very low, perhaps below the limits of detection, both because of low friability of the typical (excluding my list above) application and insulation materials, and because wiring is normally enclosed in wall, floor, or ceiling cavities.
Reader Question: asbestos used in vacuum cord SVT electrical cords?
(May 2, 2014) Frank d said:
Does vacuum cleaner cord SVT have abestos? Or has it ever contained abestos?
Svt cord is a type of UL cord that they use in vacuums it's probably highly unlikely that they use asbestos in this type of application. Ami I right?
Asbestos was used in some electric wire insulation such as high temperature wiring in heating devices and stoves and in theater wiring.
Dillon (1942) and other of our citations given below describe widespread use of asbestos in electrical appliances, devices, and in their wiring and line cords.
So SVT electrical cords are basially a cord with a thinner insulating jacket, intended for use on vacuum cleaners - appliances that often want to use a spring-loaded spool to re-wind and store the cord when it's not in use. That thin-ness limits the use of the power cord to just certain applications.
Weber (1997) cites SVT components in older guitar amps that did contain asbestos but that asbestos use was in the amplifier's structure.
I don't know that that application speaks to being able to assert the use or non-use of asbestos whatsoever. My OPINION is that where heat is an extra concern (such as toasters) we might be more likely to find that asbestos was used in an appliance electrical cord. Heat may indeed be a concern, or rather heat tolerance, in a power cord that has also to use a thin insulating jacket for other reasons. The specifications for electrical wire insulation have much to do with tolerating heat as well as other factors (flexing in power cords, moisture resistance, etc).
Asbestos was in fact mixed with rubber in some applications.
You might approach the question of whether a specific power cord contains asbestos more easily by stating the product's name, model, and date of manufacture, and if available the manufacturer could certainly answer the question. The alternative is to have a sample tested.
Possible Asbestos Insulation in Power Cable for Electric Welder
The damaged power cable shown above was used with a 1970's electric welder. Beneath the heavy rubber exterior of the welder power cable we see a cloth fabric that might be an asbestos fabric needed for extra heat resistance. Other readers familiar with this welder cable are invited to use the page top or bottom CONTACT link to offer more information. - reader anon by private email 2017/04/18
Research Citations Indicating Use of Asbestos in Electrical Wiring & Components
Avidiya, James E. "Combination door and ironing board." U.S. Patent 3,170,417, issued February 23, 1965. used asbestos in its electrical outlet.
Baddour, Joseph S. "Electrical face treating mask." U.S. Patent 2,028,889, issued January 28, 1936. used asbestos on electrical conductors in this product.
Baisch, Thelma E. "Electrically heated gravy warming ladle." U.S. Patent 4,005,310, issued January 25, 1977. The gravy warming ladle included asbestos wire insulation.
Bakke, Allan P. "Electric blood warmer utilizing a metallic ribbon-flow cartridge." U.S. Patent 4,782,212, issued November 1, 1988. included use of asbestos
Booker, Aylwin R. "ELECTRICALLY CONDUCTIVE." U.S. Patent 2,715,668, issued August 16, 1955. describes production of electrically conductive asbestos panels
Burt, Guy H. "Electrical plug." U.S. Patent 2,128,883, issued August 30, 1938. used asbestos in the cord plug as an insulator
Callahan, James J., and John P. Snow. "Electrical cable adapted for use on a tractor trailer." U.S. Patent 3,993,860, issued November 23, 1976. used asbestos in the electrical cable.
Cunningham, James D. "Electrically operated impact tool." U.S. Patent 4,323,127, issued April 6, 1982.
DICK, TALBEBT M. "Face mask or like." U.S. Patent 1,820,602, issued August 25, 1931. used asbestos
Excerpt: 4. Embedded in the face and neck portion ofthe mask is a circuit of resistance wire 13 extending in spaced. convolutions 90 throughout the area. of the face and neck-portions and which has its length of coil construction wound around a cord 14 of asbestos or like flexible material. B this arra ment of parts the convolutions will not only t completely surrounded by the rubber portion of the invention but will be held apart one from the other.
Dillon, Ernest E. "ELECTRIC VACUUM FLUE CLEANERS." U.S. Patent 2,281,144, issued April 28, 1942. Describes use of asbestos in the vacuum cleaner motor assembly:
Excerpt: An asbestos sheet 30 is interposed between the housing rear wall I4 and the housing fiange i5 and is provided with a central opening 3| through which the motor shaft 24 projects. The asbestos sheet prevents heat from gaining access to the motor and damaging the windings.
Dublirer, Kobert. "Collapsible heating pad for travelling." U.S. Patent 3,130,289, issued April 21, 1964. Describes use of asbestos wrapping in electrical components of a heating pad
Elsenheimer, Charles W. "Electric flatiron and the like." U.S. Patent 2,353,151, issued July 11, 1944. Cites asbestos electrical cord insulation as an exgternal sheath
"Electrical steam generator." U.S. Patent 2,140,516, issued December 20, 1938. Cites asbestos used in electric heater elemnents and wicks.
Governale, Anthony J., and Rolf A. Zurwelle. "RADIANT ENERGY WARMER-DRIER FOR TEXTILE ARTICLES." U.S. Patent 3,626,152, issued December 7, 1971. used asbestos sheets that were electrically conductive
Grabner, Floyd V. "Electrically heated bath drying device." U.S. Patent 3,418,452, issued December 24, 1968. describes use of asbestos on electrical components
Heiser, Myron G., and Wheeler C. Gilbert. "Attachment plug." U.S. Patent 2,343,664, issued March 7, 1944. used asbestos fluffed up layers
Herbert, William J., Bruce E. Klipec, and Clifford R. Stine. "Wire and cable." U.S. Patent 4,096,346, issued June 20, 1978. Describes use of asbestos electrical wire insulation as a fire barrier.
Irrgang, Louis J. "Strain relief for electrical conductors." U.S. Patent 2,420,826, issued May 20, 1947. Cites use of asbestos tape around electrical conductors.
Kalichmann, Isidore, and David Weissberger. "Mechanized electrically heated windshield cleaner." U.S. Patent 3,935,425, issued January 27, 1976. used an asbestos scraper
Lewis, Edward H. "Electric cord set." U.S. Patent 2,091,824, issued August 31, 1937. Cites use of asbestos electrical cord insulation.
Musgrave, Harrington Le B. "Electric heating devices and the like." U.S. Patent 2,889,439, issued June 2, 1959. Cites asbestos electrical panels in electric heaters.
Pedlow, J. Watson. "Electrical arc and fire protective sheath, boot or the like." U.S. Patent 4,018,983, issued April 19, 1977. Cites asbestos used in electrical cabling and power cords
SACKERMAN, ERNEST A. "DEVICE FOB." U.S. Patent 1,316,190, issued September 16, 1919. used asbestos components in a devie for thawing frozen pipes
Excerpt: Extending over the entire inner face of each section and suitably fastened thereto, is a layer of asbestos 6 or other heat nonconductive material. Stretched over the outer face of the asbestos layer to extend longitudinally thereover and substantially parallel to each other are a number of coiled incandescent wires 7 suitably fastened in position and insulated by suitable means (not shown) from the sections or shells 1, 1,
which coils constitute the heating means and correspond with those usually employed in the well known bread toasters or other electric heating devices. These wires, when an electric current is passed therethrough, will be heated to red heat which will be utilized for thawing the gas or water pipe.
Scott, Mindy. "Electrically heated vaporizing device." U.S. Patent 3,152,240, issued October 6, 1964. used asbestos as follows:
Excerpt: The insulation should be adequate to prevent the heating element 23 from causing the transmission of an unsafe quantity of heat to the bottom support 15, top flange 21 or to base 14. I prefer to use a layer of /8 inch thick ness asbestos 27 in conjunction with a layer of inch thickness spun glass 28 for this purpose.
Shomphe, George J. "Electrical resistance heating articles." U.S. Patent 3,417,229, issued December 17, 1968. Cites unraveling asbestos insulation exposing heater elements. Walter, Jacobsen. "Electrically heated flying suit." U.S. Patent 2,329,766, issued September 21, 1943. Cites use of asbestos padding in an electrically-heated flying suit.
Weber, Gerald. Tube Amp Talk for the Guitarist and Tech. Hal Leonard Corporation, 1997 Cites asbestos board used in guitar amps.
Werner, Arthur M. "Cordless electric iron." U.S. Patent 2,714,650, issued August 2, 1955. used asbestos in the iron stand
Williamson, Val K. "Combined table and food warmer." U.S. Patent 2,866,956, issued December 30, 1958. used asbestos in electrical components in heating plates of this electrical appliance.
Question: was asbestos used in telephone cabling or wiring?
2016/01/04 Mike said:
Would asbestos ever had been utilized in the telephone cable that has hundreds of copper conductors wrapped in paper and covered with a lead sheathing? Trying to know if this cable can be easily recycled.
I would not rule out asbestos on cable insulation, telephone or other wiring, depending on where it was intended to be used. Asbestos was used for fire protection in some telephone cabling as early as 1901 and continuing at least into the 1970's including as an alternative to the jute core wrap used on wiring that may have been then encased in lead or other metal piping.
I have found research describing asbestos exposure of telephone linemen, suggesting that asbestos was certainly used in some telephone cabling. And some patent disclosures concerning telephone cabling also included asbestos materials.
Research citing use of asbestos in telephone cabling, wiring, and core wraps
Meguellati-Hakkas, Djamila, Diane Cyr, Isabelle Stücker, Joëlle Févotte, Corinne Pilorget, Danièle Luce, and Pascal Guénel. "Lung cancer mortality and occupational exposure to asbestos among telephone linemen: a historical cohort study in France." Journal of occupational and environmental medicine 48, no. 11 (2006): 1166-1172.
Anderson, Robert W., and Robert E. Smith Jr. "Radiation resistant cable and method of making same." U.S. Patent 4,051,324, issued September 27, 1977.
Brorein, William J. "Flame retardant inside wiring cable made with an annealed metal sheath." U.S. Patent 4,154,976, issued May 15, 1979.
Joseph, Lemieux Roger. "Filled cable core with foraminous core wrap." U.S. Patent 3,681,510, issued August 1, 1972.
Saylor, Frank D. "Fire-protector for telephone-cables." U.S. Patent 688,970, issued December 17, 1901.
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asbestos hazards in arc welders?
(July 22, 2014) Mark Hunter said:
I have 2 old arc welders which I salvaged, one has copper windings and the other aluminium windings. I want the windings to use in our hobby of jewellery makeing. Both are wrapped in a type of paper tape as insulation... Could this also contain asbestos?
(July 22, 2014) Mark Hunter said:
Sorry, Just went out and had another look, the aluminium windings have a paper like tape as well as a laquer and the copper windings have a hessian string coating with a what is now a brittle black woven sheath. same question though
Here is some research on asbestos used in arc welders as well as exposure of individuals using arc welders to asbestos
Becker, Nikolaus. "Cancer mortality among arc welders exposed to fumes containing chromium and nickel: Results of a third follow-up: 1989-1995." Journal of occupational and environmental medicine 41, no. 4 (1999): 294-303.
Becker, Nikolaus, Jenny Chang-Claude, and Rainer Frentzel-Beyme. "Risk of cancer for arc welders in the Federal Republic of Germany: results of a second follow up (1983-8)." British journal of industrial medicine 48, no. 10 (1991): 675-683.
Clarke, E.J. "Electrode for electric arc welding or soldering." U.S. Patent 1,893,160, issued January 3, 1933. describes use of asbestos yarn
Excerpt: Previously electrodes for the deposition of stainless steel have comprised a mild steel core wound with asbestos yarn or other suit able non-conducting composition or material in open spirals together with an extruded coating composed of the usual fluxing ingredients and a certain proportion of powdered ferro-chromium or chromium metal; when fusion takes place under the action of the electric arc the chromium or ferro-chromium alloys with the mild steel and a deposit of stainless steel results. Electrodes for depositing stainless steels containing nickel, chromium and iron have also been made by electrolytically depositing the nickel upon a mild steel core, winding the rod so prepared with asbestos and then coating it with a compound containing powdered metallic chromium in addition to the usual fluxing ingredients. -There is a limit however to the amount of metals which may be added to the coating of such electrodes. In those cases where the amount of added metals is relatively high, complete solution of the iron, nickel and chromium does not take place.
Kennedy, H.E. et al, Gas, Electrode Carrier. "Electric arc welding." U.S. Patent 3,023,302, issued February 27, 1962. includes use of asbestos (and mica) in flux carriers
Doig, A. T., and A. I. G. McLaughlin. "X ray appearances of the lungs of electric arc welders." The Lancet 227, no. 5875 (1936): 771-774.
Sjögren, Bengt, Klaus Stagis Hansen, Helge Kjuus, and Per-Gunnar Persson. "Exposure to stainless steel welding fumes and lung cancer: a meta-analysis." Occupational and environmental medicine 51, no. 5 (1994): 335-336.
Question: Anaconda Dutrax C or G , type NM with 600v rating containing asbestos?
(Jan 5, 2015) Chuck said:
Old. Anaconda Dutrax C or G , type NM with 600v rating. This wire insulation sure looks like the pictures
of the asbestos wiring that you have. Is it?
I'm sorry Chuck but just from your e-note I don't know the answer. If you face large possible costs you could have a sample of the wiring insulation tested by a certified asbestos lab (don't send it to me).
If the material is not damaged and is not in an area to be disturbed it might be left alone - lowest risk. Treat it as presumed to contain asbestos.
I would like to see some sharp photos of the wire and its insulation and markings - that may permit us to do some further research.
Schleicher, Robert H. The R/C Car Bible. Voyageur Press, 2006. cites use of asbestos-insulated materials and Anaconda Durex wiring
Question: asbestos used in PCB's (printed circuit boards)?
(Jan 13, 2015) Anonymous said:
was asbestos ever used in PCB's (printed circuit boards)?
I'm concerned my sega genesis and its game cartridges might contain in. The sega genesis came out in 1988 in Japan and 1989 here in the usa.
By 1988 it's unlikely you'd find asbestos in printed circuit boards. In older electronic equipment where asbestos may have been used in non-friable components most likely any asbestos release from those undisturbed components would be below the limits of detection.
Keep in mind that many electronic circuit boards include other highly toxic components that may be released, particularly during burning and possibly during demolition, as is the case as well with plastics in general.
PCBs are of course a separate hazard.
Thank you for the quick reply, i feel better about using my sega genesis now, thank you.
29 January 2015 Renée said:
When reviewing our Asbestos report it is noted that the incandescent light bulb heat shield fixture may or may not contain asbestos. I can not for the life of me figure out what they are making reference to. Please explain
Renee I can't of course see your report (you can send it to me by email found at our CONTACT US link at page top or bottom) but an incandescent light bulb is an older technology or "conventional" light bulb that uses a heated filament - unlike newer LED or florescent bulbs. A heat shield fixture could be hidden away in any of many sorts of older light fixtures such as recessed ceiling lights or even a lamp socket. I'd be interested to know if your inspector actually saw such a fixture or if rather you are seeing a generic "CYA" remark in a boilerplate section of a report. In any event only if asbestos material is soft, friable, damaged, or easily damaged and tracked into a living area is an individual light fixture asbestos material likely to be a measurable risk.
Question: asbestos in 1970's table lamps?
29 January 2015 Mary said
We took an old table lamp apart from the mid 1970's. Would there be the possibility of any asbestos in the wiring or the felt glued to the bottom. There were some fibers in the lamp on the felt bottom when we tore it off.
Also a few days later, it felt like something was stuck in my left nostril and was throbbing. It took about ten minutes of blowing and the use of saline solution to get any relief. Could this be because of asbestos spores in the air. The lamp was taken apart in the bedroom.
Mary asbestos was used in some (not all) electric lighting lamps in lamp cords, sockets, insulators from at least as early as 1903 (See Sylvania (1903) below. Its use in felt used to avoid scratching a table surface seems unlikely. However asbestos was used in a paper form in some lamp bases - See Vaughn (1950) in my citations and See Lewis (1935) in the citations below for an example.
I'll add that if the lamp bottom looks like white or white-gray paper that might be asbestos paper. If it looks like green felt, it probably is green felt.
Des, Jardins Leonard A., and Fred R. Fleming. "Apparatus for disinfecting shoes and the like." U.S. Patent 2,070,858, issued February 16, 1937. this product used asbestos
Heiser, Myron G., and Wheeler C. Gilbert. "Attachment plug." U.S. Patent 2,343,664, issued March 7, 1944. used asbestos in the cord plug and wiring
ISAACS, M. "Seed germinator." U.S. Patent 1,648,309, issued November 8, 1927. used asbestos sheets and a duplex lamp cord
Lewis, Edward H. "Lamp cord." U.S. Patent 1,989,483, issued January 29, 1935. cites use of asbestos in the lamp wiring.
SPATIG, CHARLES W. "SYLVANIA." U.S. Patent 729,862, issued June 2, 1903. Excerpt: This receptacle is provided with interior partitions 2, which form a box to receive the iron core or heating-coil 3. This latter is insulated with asbestos 4 or other suitable material which prevents the wire or core from coming in contact with the metal and has the feed wire 5 connected thereto.
Vaughan, Daniel J. "Lamp base." U.S. Patent 2,515,747, issued July 18, 1950. Used asbestos in the lamp base. Excerpt: The base I comprises a body portion 3 of insulating material, preferably porcelain. The said body portion 3 is secured to the end of the envelope 2 by means of a metal skirt or collar 4 which is secured to an enlarged shoulder 5 on said body portion 3. Before the skirt 4 is slipped over the end of the tube 2, a thin strip 6 of asbestos paper moistened with a. solution of sodium silicate is wrapped around the envelope 2. The skirt 4 is secured firmly in place on the envelope 2 by a suitable clamping strip 'i, the skirt 4 being provided with a multiplicity of slits 8 therein so as to be readily compressible by clamping strip 1 around the asbestos strip 6 and clamp the latter between the lamp envelope 2 and the clamp I. The outer end 9 oi the body portion 8 carries a spade-shaped nietal electrical contact prong it which extends outwardly therefrom and longitudinally of the lamp envelope 2. The said prong i0 is electrically connected by a flexible conductor ii to the end of a current lead-in wire I! which extends through a seal l3 and is electrically connected to the electrode or filament (not shown) in the envelope 2.
The paper glued to the bottom of the lamp was a white-gray paper. You said that it might be asbestos. We tore it off the lamp when we were repairing the lamp. We did this work in the bedroom. A few days later I had an irritation in my nose that lasted for about ten minutes. What should I do? Is there possibly asbestos in the air? What should I do with the lamp? What should I do about breathing asbestos in the air? Is there anyone I can contact?
If it was gray white paper it may have been just cardboard or it *might* have been an asbestos paper.
Unless you really shredded the paper, I would guess that the amount of airborne asbestos from pulling off and throwing away a say 6-inch diameter piece of paper on a lamp bottom would be beneath the limits of detection. I would not be inclined to spend much on this but if you are very anxious it might help to collect a settled dust sample from the bedroom (using clear adhesive tape) and have that examined by a test lab. That cost is about $50. U.S.D.
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 Asbestos, its Industrial Applications, D.V. Roasato, engineering consultant, Newton MA, Reinhold Publishing Co., NY, 1959, Library of Congress Catalog No. 59-12535. We are in process of re-publishing this interesting text. Excerpts & adaptations are found in InspectApedia.com articles on asbestos history, production & visual identification in and on buildings.
 "Asbestos in Plastic Compositions", A.B. Cummins, Modern Plastics [un-dated, pre 1952]
 "Asbestos in Your Home," Spokane County Air Pollution Control Authority, Spokane WA 509-477-4727 www.scapa.org provides a one-page image, a .pdf file drawing of a house warning of some possible sources of asbestos in the home. The sources are not ranked according to actual risk of releasing hazardous levels of airborne asbestos fibers and the list is useful but incomplete.
 The US EPA provides a sample list of asbestos containing products epa.gov/earth1r6/6pd/asbestos/asbmatl.htm
 "Characterization of asbestos exposure among
automotive mechanics servicing and handling
asbestos-containing materials", Gary Scott Dotson, University of South Florida, 1 June 2006, web search 3/9/2012 original source: scholarcommons.usf.edu/cgi/viewcontent.cgi?article=3505&context=etd [copy on file as /hazmat/Automotive_Asbestos_Exposuret.pdf ].
 Asbestos Identification and Testing References
Asbestos Identification, Walter C.McCrone, McCrone Research Institute, Chicago, IL.1987 ISBN 0-904962-11-3. Dr. McCrone literally "wrote the book" on asbestos identification procedures which formed
the basis for current work by asbestos identification laboratories.
Stanton, .F., et al., National Bureau of Standards Special Publication 506: 143-151
Pott, F., Staub-Reinhalf Luft 38, 486-490 (1978) cited by McCrone
 Asbestos in Your Home U.S. EPA, Exposure Evaluation Division, Office of Toxic Substances, Office of Pesticides and Toxic Substances, U.S. Environmental Protection Agency, Washington,D.C. 20460
 Asbestos products and their history and use in various building materials such as asphalt and vinyl flooring includes discussion which draws on Asbestos, Its Industrial Applications, D.V. Rosato, engineering consultant, Newton, MA, Reinhold Publishing, 1959 Library of Congress Catalog Card No.: 59-12535 (out of print, text and images available at InspectAPedia.com).
 "Handling Asbestos-Containing roofing material - an update", Carl Good, NRCA Associate Executive Director, Professional Roofing, February 1992, p. 38-43
 EPA Guidance for Controlling Asbestos-Containing Materials in buildings, NIAST, National Institute on Abatement Sciences & Technology, [republishing EPA public documents] 1985 ed., Exposure Evaluation Division, Office of Toxic Substances, Office of Pesticides and Toxic Substances, U.S. Environmental Protection Agency, Washington,D.C. 20460 Copy on file as - /hazmat/Asbestos_in_Your_Home_US_EPA.pdf - Asbestos in Your Home - U.S. EPA, Exposure Evaluation Division, Office of Toxic Substances, Office of Pesticides and Toxic Substances, U.S. Environmental Protection Agency, Washington,D.C. 20460
Basic Information about Asbestos, US EPA, web search 08/17/2010, original source: http://www.epa.gov/asbestos/pubs/help.html
"Handling Asbestos-Containing roofing material - an update", Carl Good, NRCA Associate Executive Director, Professional Roofing, February 1992, p. 38-43
EPA Guidance for Controlling Asbestos-Containing Materials in buildings, NIAST, National Institute on Abatement Sciences & Technology, [republishing EPA public documents] 1985 ed., Exposure Evaluation Division, Office of Toxic Substances, Office of Pesticides and Toxic Substances, U.S. Environmental Protection Agency, Washington,D.C. 20460
Copy on file as - /hazmat/Asbestos_in_Your_Home_US_EPA.pdf - Asbestos in Your Home - U.S. EPA, Exposure Evaluation Division, Office of Toxic Substances, Office of Pesticides and Toxic Substances, U.S. Environmental Protection Agency, Washington,D.C. 20460
[copy on file as /hazmat/Vermiculite_US_EPA.pdf/ Current Best Practices for Vermiculite Attic Insulation - May 2003, U.S. EPA
[copy on file as] /hazmat/Vermiculite_Health_Canada.pdf] Vermiculite Insulation Containing Amphibole Asbestos - September 2009, Health Canada
Managing Asbestos in Place, How to Develop and Maintain a Building Asbestos Operations and Maintenance (O&M) Program, U.S. EPA, web search 01/20/2011, original source: http://www.epa.gov/asbestos/pubs/management_in_place.html
Asbestos Strategies, Lessons Learned about Management and Use of Asbestos: Report of Findings and Recommendations on the Use and Management of Asbestos, 16 May 2003, US EPA, web search 01/20/2011, original source: http://www.epa.gov/asbestos/pubs/asbstrategiesrptgetf.pdf
prepared by the: Global Environment & Technology Foundation, 7010 Little River Turnpike, Suite. 460, Annandale VA 20003
Other US EPA Publications on asbestos: web search 01/20/2011, see http://www.epa.gov/asbestos/pubs/pubs.html
Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair
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