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Mineral wool insulation in an atticRock Wool, Stone Wool, Mineral Wool, & Slag Wool Building Insulation Identification
Natural and man-made stone or vitreous fibers

Here we discuss the properties, appearance, health hazards, and possible asbestos content in mineral wool insulation.

This mineral wool or "rock wool" insulation article illustrates and describes mineral wool or "rock wool" and slag wool insulation materials. Our page top photo shows what this insulation may look-like in place in a building attic.

Rock wool or "rockwool" insulation is also called mineral wool and slag wool though there can be differences among the components of these insulations. We describe old-house or "antique" mineral wool insulation as well as modern mineral wool insulating products still used in buildings.

This document assists building buyers, owners or inspectors who need to identify various insulation materials in buildings by simple visual inspection. We provide photographs and descriptive text of various types of mineral wool insulation and describe its properties, how it is made, health and maintenance concerns, and its insulating values.

InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.

Mineral wool or "rock wool" or "slag wool" building insulation properties

Mineral wool in an attic in Canada  (C) InspectApedia.com & Carson Dunlop Associates TorontoMineral wool insulation, developed in the 1850's, patented in 1875 in the U.S. and this material, also called rock wool or in some texts slag wool insulation remained in popular use in the U.S. up to the 1950's, and is still in use today in some new construction, in manufactured housing, and in special applications such as the insulation of low-slope roofed cathedral ceilings and scissors-truss roofs.

Mineral wool is produced by melting rock and slag using coke as a fuel.

The molten minerals are spun into fine fibers using high-velocity spinning rotor and a stream or air or steam.

A binder is applied to the fibers that are then collected on a wire mesh conveyer.

The mineral wool fibers are then cut or granulated and packaged for shipment or they are further cured with additional binder so that the resulting fiber blanket can be cut into insulating batts and in some products, combined with a vapor barrier or facing.

In our photograph of white mineral wool insulation shown here in the attic of a Canadian home, the insulation was delivered and installed in a chopped or "granulated" form that was simply poured and raked level between the floor joists of an attic.

Photograph above provided courtesy of Carson Dunlop Associates, a Toronto home inspection & education firm.

Below: While mineral wool insulation may be white, gray, black or even pink, it most-often looks like either the photos just below.

Brown dense packed mineral wool insulating batt (C) Daniel Friedman

See all of the MINERAL WOOL APPEARANCE VARIATIONS in our separate photo guide to the different versions, colors, and textures of mineral wool, rock wool, or slag wool insulation.

Johns Manville Spintex Mineral Wool Insulation (C) InspectApedia DK

See these separate articles if you want to compare your insulation that might be mineral wool with

FIBERGLASS INSULATION

SHEEPS WOOL INSULATION 

Definitions of Mineral Wool, Mineral Fiber & Fiberglass

Below we show a much-magnified image of mineral wool insulation showing the characteristic glassy globules or spheres found in the product. In this image we're looking at mineral wool magnified about 30x in a stereo microscope.

Gold Bond brand Mineral Wool in a Haddonfield New Jersey Home in the U.S. (C) Daniel Friedman

According to the US EPA,

The term "mineral wool" can be used to describe any fibrous glassy substance made from minerals or mineral products.

For the purpose of this study, mineral wool has been defined to include only those fibers made primarily from natural rock or metallurgical slag. 

Below we show mineral wool fibers as seen under our lab microscope, magnified about 400x.

Gold Bond brand Mineral Wool in a Haddonfield New Jersey Home in the U.S. (C) Daniel Friedman

Shown above: photographs of Gold Bond™ brand mineral wool insulation in a 1960's Haddonfield New Jersey Home, viewed first under the stereo microscope and then (immediately above) at 400x. You can see the gold colored resin binder that gave this insulation its product name - Gold Bond.

What's the difference between mineral fiber insulation, mineral wool and fiberglass?

Mineral wool insuilation in an older installation may be darkened with soot and dust (C) InspectApedia.com

Mineral fiber insulation includes two insulation groups: stone wool insulation (insulation made from rock and slag) and fiberglass insulation (glass fiber insulation).

Adding a bit of confusion, stone wool insulation manufacturers may call their product "rock wool", "Rockwool", "mineral wool" or even "mineral fiber". Rock wool and stone wool are essentially the same, as we will explain on this page.

Click to enlarge any image]

  1. Mineral wool insulation

     like that shown in our photograph, includes only stone wool insulation (insulation made from rock and slag).

    Mineral wool insulation will not contain any fiberglass.

    Therefore, properly, the term mineral wool insulation is a proper subset of mineral fiber insulation.

    Some stone wool insulation products have an oil added to the product to reduce dust - a feature not found in fiberglass insulation.

  2. Fiberglass,

    in its most broad use, refers to a reinforced plastic made from glass fibers embedded in a resin matrix, or to a textile woven from glass fibers or filaments.

    Fiberglass insulation
    is comprised principally of glass fibers bound together in a loose matrix by small amounts of resin.

    Glass fibers, as in fiberglass insulation, are a flexible but still fragile fiber made by fusing sand with soda, lime and other ingredients.

    Because glass (including the glass fibres that comprise fiberglass insulation) uses a base of sand, a granular rock fragment comprised principally of siliceous and other rocks (the beach), that defines glass as a mineral fiber.

    Our photograph below shows modern fiberglass insulation fragments under the microscope at about 1000x. The yellow-green material is a resin binder.

Lab photo of building insulation

To remind us of sand as the principal ingredient of glass, I include below my photograph of sand at Woodend Beach, Christchurch, New Zealand.

Sand on Woodend Beach, Christchurch New Zealand (C) Daniel Friedman

Watch out: the use of "stone wool" in the literature and product names used by some manufacturers can be a bit confusing. For example CertainTeed's Insulsafe® Sp Premium Blowing Wool is described by the company as "blowing wool" that is a fiberglass product.

From the company that invented Premium Blowing Wool -

InsulSafe SP is a fiberglass blowing insulation used in residential and commercial construction as a thermal and sound absorbing insulation. It is designed for pneumatic installation in open (attic) and closed (sidewalls/floor) construction cavities.

It may be used in retrofit applications. - source: InsulSafe SP product description retrived 2018/0608, original source: https://www.certainteed.com/building-insulation/products/insulsafe-sp-premium-blowing-wool/

Comparison Table: Fiberglass vs Stone Wool Insulation

Feature Fiberglass Mineral Wool
Classification Mineral Fiber glass made from sand, a mineral

Mineral Fiber made from melted rock

May contain recycled steel (slag)

Ingredients

Glass fibers bound in a loose matrix by resin.

20-30% recycled content

Mineral fibers made from basaltic rock & slag (from steel production) melted at 3000°F

May contain recycled glass

May have oil added to reduce dust

Up to 70% recycled content

Cost / sq.ft. (loose fill) $0.281

$0.501

Typically 25-45% more costly than fiberglass

Density

0.5 to 1.0 pounds per cubic foot4

12.2 kg/m3 in 3 1/2" batts8

1.7 pounds per cubic foot4

44.2 kg/m3 in 3" batts8

Dimensional stability / rigidity Lower than mineral wool Greater than fiberglass
Fire Resistance

Lower fire resistance than mineral wool

Meets building codes/standards

Greater fire resistance than fiberglass

Greater density improves fire resistance

Meets building codes/standards

Installation in walls, ceilings Requires stapled facing or wire support
Cut with box knife
Friction fit, self-supporting
Cut with serrated knife
Loose fill Widely available Available, less widely than fiberglass
Melting point 1,200°F 2,000°F
Mold resistance Equivalentt2 Equivalent2
Rigidity Lower than rock wool Higher than fiberglass, easier to install & cut batts
R-Value 2.2 to 2.7 per inch 3.0 and 3.3 per inch
Sound isolation - STC rating

Sound Reduction 4-10 dB depending on installation details

STC improves by 4-10 points over an empty cavity.9

Equivalent according to CertainTeed3

Sound Reduction typically 10 dB in common stud wall

STC 42-555 6 8

Equivalent according to CertainTeed3

Thermal Resistance Greater than rock wool due to lower density, lower conductivity  
Transportation Lower density, compressed, 3x more batts transported per unit volume Higher density, fewer batts transported per unit volume
Water resistance Hydrophylic, takes up water, easily becomes soggy Hydrophobic, resists taking-up water
Weight .68 the weight of mineral wool per unit volume 1.46 heavier than fiberglass per unit volume

Notes to the table above

  1. The terms Mineral Wool, Rock Wool, Rockwool, Stone Wool, and Slag Wool all refer to mineral-fibre insulation of various mixes and properties. In general Rock wool or stone wool use stone as their primary ingredient with an inclusion of some slag wool while slag wool insulation uses slag wool (made from blast furnace slag) as its primary ingredient with an inclusion of some stone or rock wool, typically basalt.
  2. FIBERGLASS vs STONEWOOL, FACTS YOU SHOULD KNOW BEFORE YOU INSULATE [PDF] CetainTeed Corporation, 20 Moores Rd. Malvern PA 19355 USA Website: certainteed.com - retrieved 2018/06/08, CertainTeed Corporation, original source: https://www.certainteed.com/resources/30-45-073.pdf

    OPINION: this brochure appears to be written from a "pro-fiberglass" point of view and may be incomplete - editor.
  3. See FIBERGLASS INSULATION MOLD
  4. National Research Council of Canada (NRC) Report. [citation details needed]
  5. U.S. Department of Energy
  6. MINERAL WOOL STC TYPICAL SOUND BARRIER ASSEMBLIES [PDF] Johns Manville Corporation, Building Insulation Division P.O. Box 5108 | Denver, CO 80217-5108 USA Website: www.JM.com Tel: 1-800-654-3103 | retrieved 2018/06/08, original source: https://www.jm.com/content/dam/jm/global/en/ building-insulation/Files/BI%20Data%20Sheets/ BI%20Canada/BID_CAN_6MineralWoolSTC.pdf
  7. SOUND ATTENUATION FIRE BATT INSULATION / MINERAL WOOL, [PDF] Owens Corning, retrieved 2018/06/08, original source: http://www2.owenscorning.com/around/sound/commercial_acoustics/soundatt.pdf
  8. ACOUSTICAL ASSEMBLIES, [PDF] U.S. Gypsum Corp., retrieved 2018/06/08, original source: http://www.usg.com/content/dam/ USG_Marketing_Communications/united_states /product_promotional_materials/finished_assets/ acoustical-assemblies-en-SA200.pdf
  9. ROXUL AFB® ACOUSTICAL FIRE BATTS [PDF] retrieved 2018/06/08, original source: https://www.pharosproject.net/uploads/ files/sources/583/1375800155.pdf
  10. SOUND ATTENUATION BATTS [PDF], Owens Corning, retrieved 2018/06/08, original source: https://www2.owenscorning.com/around/ sound/commercial_acoustics/pdf/ SoundAttenuationBatt.PDF
  11. Research cited atReferences or Citations
  12. Our independent research 2018/06/08

List of Major Rock Wool / Mineral Wool Insulation Producers

Amerian Rockwool Premium Plus rock wool insulation at InspectApedia.comIn the U.S. there were between 80 and 90 mineral wool manufacturers in the 1950's. By 1980 in the United States mineral wool manufacturers included these facilities. Current rockwool producers in the list below are shown in bold face.

Watch out: as you will read in some of the "mineral wool" insulation product descriptions found below, the distinction between fiberglass insulation and mineral wool insulation is blurred by some manufacturers who label their product as "mineral fiber" insulation but in product details explain that their "mineral fiber" is glass fibers (yes glass is made from sand which is a mineral).

Those insulations could also be called "fiberglass" and are not "true" or "traditional" mineral wool fiber products such as others described on this page.

Photo: an excerpt from Amerian Rockwool's Premium Plus™ photographs.

Notice that this insulation is pink and may be mistaken for some fiberglass products. Source: http://americanrockwool.com/rockwool-premium-plus.htm retrieved 2018/06/08.

Celotex mineral wool blanket insulation (C) InspectApedia.com Luke

Gold Bond Rock Wool insulation facing (C) Daniel Friedman at InspectApedia.com

Below: photos of JM Ful-Thik Rock Wool Insulation, provided courtesy of home inspector Lawrence Transue.

Johns Manville Ful-Thik Rock Wool Insulation (C) InspectApedia.com Lawrence Transue Home Inspections ... Johns Manville Ful-Thik Rock Wool Insulation (C) InspectApedia.com Lawrence Transue Home Inspections

Below: Knauf Greenguard formaldehyde-free mineral wool insulation.

Knauf Greenguard mineral wool insulation at InspectApedia.com

Knauf Insulation Acoustical Smooth Board glass fiber batts - at InspectApedia.com

Above: Knauf Smooth Board sound insulation batts. The color of this and many fiber insulation products is an artifact of the particular binder chosen by the manufacturer.

Premium Brand Insulatin Indiana Rock Wool Kraft Facing (C) InspectApedia.com David

Comment: Premium Brand RockWook made in Pueblo CO

Premium Brand Rock Wool Insulation - Pueblo Colorado (C) InspectApedia.com DuncanHey there, thank you for what you do, while investigating asbestos content in materials uncovered while doing a remodel I came across your page, just wanted to pass this along if it helps with identification for people and to possibly correct a typo, under the premium insulation portion of this post I noticed "Pueblo, Indiana" as a corporation location I believe that should probably say Pueblo, Colorado rather than Indiana,

[Click to enlarge any image]

the remodel I'm doing is in Pueblo, CO, and Pueblo is also known for it's Steel plant which is responsible for all of the steel railroad tracks west of the Mississippi,

and would also make sense in terms of Rockwool manufacture as all of the associated resources and facilities for Rockwool would have been and still are available here in abundance since the early 1900's, hope this helps and thanks again for what you do. - Ernie Duncan, 2022/01/11

Moderator reply:

@Ernie Duncan,

Thanks so much, that Kraft facing certainly says that that insulation was produced or labeled as Pueblo Colorado. We'll be sure to keep it with this article.

MOST references to Rockwool production in Pueblo do indeed refer to Pueblo, Colorado, as shown in your photo and noted in your post.

There were mineral wool and rock wool and rockwool manufacturing facilities in multiple locations, and as we found in some EPA document searches, there were referenced Pueblo Illinois as location of a rock wool manufacturing plant too. [Or that original source was in error - we are researching that question further]

Premium Brand Insulation Group, produced rock wool insulation under the following brands:

AND

Separately we had this location:

Information source:

Question: age of Premium Brand Insulation Batts

Premium Brrand Indiana Rockwool (C) InspectAPedia.com Stacey

Can you help me determine when these Premium Brand battings were produced or direct me to a manufacturer's historical product site? - Stacey 2021/07/25

Premium Brrand Indiana Rockwool (C) InspectAPedia.com Stacey

Moderator reply:

On this page you will want to see our description of the Premium Brand insulation compaby,

Indiana Rock Wool Division, Alexandria Indiana, -

As you will see, that product was produced over many years, so what you're going to need to look for are some black and letters and numbers stamped on the craft facing.

That will give a production run number.

If you can find those and post a photo that would be helpful.

Susquehana Premium Brand Rock Wool Insulation kraft facing label (C) InspectApedia.com

Owens Corning Thermafiber Insul-Fill Blown-in attic insulation - cited & discussed at InspectApedia.com

Owens Corning Thermafiber INSUL-FILL Wall Spray insulation - cited & discussed at InspectApedia.com

According to Rockwool International1, headquartered in Denmark, in 2016 there remained just five mineral wool / stone wool producers in North America.

Rockwool is currently produced in the U.S. in Indiana, North Carolina, Texas, and Washington State as well as being produced in other countries.

  1. "Descriptive use of ROCK WOOL at InspectApedia, Fair Use + Research Citations", ROCKWOOL International A/S Hovedgaden 584 DK-2640 Hedehusene Denmark Tel: (+45) 46 56 03 00 Fax: (+45) 46 56 33 11 VAT-number: 54879415 Email: info@rockwool.com Personal correspondence, MK to DF 2016/11/22
  2. U.S. EPA, SOURCE CATEGORY SURVEY: MINERAL WOOL MANUFACTURING INDUSTRY [PDF] U.S. Environmental Protection Agency, Office of Air, Noise, and Radiation, Office of Air Quality Planning and Standards, Research Triangle Park, North Carolina 27711 (March 1980)

Airborne particle characteristics of Rock Wool / Stone Wool Insulation

Rock wool insulation © Daniel Friedman

Question: Gold Bond Wool Rock Insulation

(May 3, 2012) Gold Bond Rock Wool said:

I've started removing fiberboard from the walls of an old porch-turned-bathroom and found the same Gold Bond Wool Rock as in your photos. Regarding the disintegration factor you mentioned, the product in my walls is very loose.

I had trouble removing a section without it coming off the paper and falling apart in my hands.

Since that piece was on the floor and to the open ground to daylight, I would think that particles eventually escaped plus the elements over time (heat in southern climate and/or lack of ventilation) created the deterioration.

Ants had made a colony in the insulation and the paper is frail, I am removing it.

Reply: rock wool is not an asbestos product

No Mike, rock wool is not an asbestos product, at least not as generally would be found in a residential building.

Patent research does, however, disclose some mineral wool or "rock wool" insulation products that were indeed combined with asbestos for special applications.

Details are at ASBESTOS IN MINERAL WOOL / STONE WOOL

Our photo above shows the original branding of Gold Bond™ Rock Wool, insulation observed in a 1920's home built in Poughkeepsie, NY. Because it is more dense (about 1.2 pounds /cubic foot) than some other insulating materials such as fiberglass (about 1/2 pound per cubic foot), some writers point out that rockwool is less likely to become airborne.

This is a confusing view unless supported by more specific data. Most air movement in buildings is upwards and outwards through the building attic.

We have identified some conditions in which air moves down from building attics into the occupied space, such as when a whole house fan is inadequately vented to the outdoors (and the attic is both pressurized and its dust stirred up by the fan).

A fiberglass batt provides less total volume of small particles to be stirred by an attic fan than does granular insulation such as vermiculite, rockwool, blown-in cellulose, or even chopped fiberglass (used in blown-in installations).

We'd also need to consider the average particle size and weight when evaluating the ease with which a material becomes airborne. So particle density or density of an insulation material per cubic foot is not the whole story.

How to Avoid Moisture & Settling Problems when Spray Applying Mineral Wool, Rock Wool, Slag Wool Insulation

Because these mineral fiber insulation products are often applied by spraying as a wet slurry onto building surfaces or into building cavities, they should not be covered by a vapor retarder barrier until the insulation has dried.

We recommend using a long-probe moisture meter such as models made by Delmhorst™ to assure that the rock wool sprayed into building cavities has dried to ambient indoor humidity before the wall or ceiling is covered with a vapor retarder or enclosed.

Mineral wool insulation is used by some manufactured home and possibly some mobile home manufacturers. Because these structures are later transported to their ultimate building site the insulation is exposed to vibration that can cause settling of the insulation within building cavities.

Wet-process blown-in mineral wool insulation thickness can decrease by up to 16% in this case, according to Graves and Yarborough.

What the study did not examine, and which may be still more important, would be the development of gaps at the tops or sides of vertical wall sections if settlement moves the wall cavity insulation. - "An Evaluation of the Settling of Loose-Fill Rock Wool Insulation in the Attics of Two Manufactured Home Units", ASTM, Graves RS, Yarbrough DW, January 1990.

A review of patent disclosures shows that some mineral wool insulation products added cellulose, flax, or other products to reduce settlement when this material was installed in walls.

On 2017-10-17 by Van - will adding cellulose cause a packing problem in the original rock wool insulation?

I think I may have wool insulation in my attic. It is white and fluffy. I do not have enough. What would be the best type of insulation to put on top of it?

I was thinking cellulose however someone said that may not be a good choise. It would pack it down.

On 2017-10-17 by (mod) - are there settling or packing issues when adding loose-fill cellulose on top of Rock Wool insulation?

Mineral wool loose-fill can be covered over by fiberglass batts, chopped fiberglass, or cellulose. There is no specific settling/packing issue that arises when placing loose fill cellulose over existing insulation.

Really? OPINION: if insulation in walls settles to leave a gap at the top of each wall stud cavity where there is no insulation at all, I would hardly call that an improvement in the wall's R-value. The author's discussion above makes sense for insulation loosely-filled into a horizontal area such as an attic floor. - Editor.

What is the insulating R-value of mineral wool?

R-values of various thicknesses of Rock Wool (C) InspectApedia.comMineral wool is a good insulating material and has a better "R" value and more sound-reduction ability per inch than some fiberglass. Rock Wool insulating Batts have an R value of about 3.14 to 4.00 per inch.

Blown-in rock wool or mineral wool insulation such as that shown in our attic photos above on this page, has an R value of about 3.10-4.00 per inch.

Other sources we researched indicated that slag wool loose-fill insulation had an R value of about R-2 to R 3.3 and one source claimed an R value of 4.1 per inch for rock wool. [Home Energy Magazine Online, July/August 1997]

In the Indiana Rock Wool R-values table shown here, you'll see that two-inches of that mineral wool product was rated at R 7 and six-inches at R-22. That compares with typical low-density fiberglass insulation that is about R-19 for six-inches.

Bottom line: a safe rough estimate is to assume mineral wool made of rock or slag has an R value of about 3.35 per inch in batt form and an R value of about 2.25 in loose fill installations.

To compare insulating material R-values see our table

of INSULATION R-VALUES & PROPERTIES

Question: Does the R-value of mineral fiber insulation deteriorate with age?

What about R-value deterioration of rock wool as it ages? - Fabian Jennings fjenn@telus.net

Reply: No, except insofar as the loose fill insulation may become compacted or unevenly distributed due to disturbance or settle over time

Rock wool does not deteriorate in R-value except, as would be the case with any loose fill insulation, if it is disturbed so as to no longer be uniformly distributed, or if it is packed by being compressed from storing items on top of it or walking on it or something similar.

However in vertical applications such as wall cavities, there were problems with rock wool settling. If settlement leaves voids at the top or sides of an insulated wall cavity, that'd certainly reduce its effectiveness.

I don't have data on the time-rate of settlement of mineral wool insulation - something that will be interesting to research. I have read of efforts to mix other fibres in with mineral wool to reduce the settlement problem.

Special thanks to our content-contributors including

Mineral Wool Rock Wool Insulation History & Research

Constituents of Rock Wool or Mineral Wool Insulation? (it's not asbestos)

Please see this separate page: MINERAL WOOL / "Rock Wool" COMPOSITION

Appearance of Mineral Wool Products

Mineral wool is generally a dull white but may be fairly homogenous gray (shown earlier on this page) or mineral wool may have black components, especially in older buildings.

Current mineral wool batts are also manufactured in a brown color.

Please see details at MINERAL WOOL APPEARANCE VARIATIONS

 




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Reader Comments, Questions & Answers About The Article Above

Below you will find questions and answers previously posted on this page at its page bottom reader comment box.

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs

On 2021-10-20 by inspectapedia.com.moderator (mod) - Trademark clarification for ROCKWOOL

ROCKWOOL trademark as per https://www.rockwool.com/asia/rockwool-trademark/ retrieved 2021/10/21 cited at InspectApedia.co  @Gary Hillis,

Thank you for supportive comments. We will eventually move this, to a more appropriate age such as our discussion of mineral wool and rockwool products. In our response to the corporation whom you were discussing we simply sent them photographs of other products made by other companies that had the same "rock wool" phrase right on the product itself as well as in numerous magazine and newspaper advertisements.

Incidentally, the ROCKWOOl trademark shown above may be a bit amusing or confusing as there is no visible TM or "Trademark" indicator on the company's own web page discussing this topic. (https://www.rockwool.com/asia/rockwool-trademark/ ) discussing this topic.

On 2021-10-20 by Gary Hillis - ROCKWOOL Trademark vs Rock wool & similar terms?

The letter from ROCKWOOL isn't in the least confusing. They are trying to make you believe something that is patently (trademarkedly?) false. ROCKWOOL, one word, all caps is their trademark. Any other presentation is likely to be thrown out of any but the most corrupt court unless someone was actually labeling/marketing a product in a way that would be likely to be confused by the consumers of the product.

Their trademark only goes back to 1936. US Patents for a product described as rockwool predate the trademark. If you are not marketing a product using the word rockwool, or trying to trademark it yourself, you are in no more danger of infringing on or diluting their trademark than you would be for asking for a Kleenex instead of a facial tissue.

You could have your lawyer draw up a letter to them stating that you consider their letter to be harassment since rockwool is a generic term, that your use would be fair use if it were not, that your use is noncommercial, and that it falls under news reporting and commentary; they would go away because those are arguments they could not win against in court (2) (4).

They are obligated to their shareholders to defend their trademarks as they are considered assets, but that doesn't mean they should or will succeed (3).

They can beat someone who tries to trademark rockwool, but they will never go after you for treating as the generic term it is for fear of losing their trademark.

Citations:

https://inspectapedia.com/insulation/Rock_Wool_Insulation.php - you are on this page

1) https://www.rockwool.com/asia/rockwool-trademark/

2) Rockwool International A/S & Anr. vs Thermocare Rockwool (India) Pvt. ... on 16 October, 2018 [PDF] retrieved 2021/10/21 original source: https://indiankanoon.org/doc/171023357/?__cf_chl_jschl_tk__=pmd_giQy5ImNMMaV_k5sXeckoQmJ7_QeAg5g20C09k1k7Ms-1634701452-0-gqNtZGzNAjujcnBszQi9

3) Garber, Megan, 'Kleenex is a Registered Trademark' (and Other Desperate Appeals), [PDF] The Atlantic, 25 September 2014, retrieved 2021/10/21 original source: https://www.theatlantic.com/business/archive/2014/09/kleenex-is-a-registered-trademark-and-other-appeals-to-journalists/380733/

4) Justia, TRADEMARK DILUTION [PDF] retrieved 2021/10/21 original source: https://www.justia.com/intellectual-property/trademarks/trademark-dilution/

On 2021-02-08 by (mod)

Jeff

You are welcome to use the page top or bottom CONTACT link to send us email and I'll dig out Aleksandra's email and offer to put you both in contact.

On 2021-02-08 by Jeff

Aleksandra, have you been able to locate any slag wool? If not, how may I contact you directly?

Rock wool insulation SEM photograph (C) Eurofins & InspectApedia.comOn 2020-10-23 by Aleksandra

As for the possibility of sending slag samples to Poland I would be grateful and share the analytical results on forum.

Usually we have limited rights to publish the projects and results due policy of company :)

On 2020-10-22 by (mod)

Alexsandra - or you can find our email in the page top or bottom CONTACT link.

Your SEM images are posted at

MINERAL WOOL by MICROSCOPE

Thank you.

On 2020-10-22 by Aleksandra

I had difficulties to upload images. I can send it via e-mail.

I upload images comes from SEM including EDX spectra starting from rockwool morphology (attached). Hopefully I will add slag wool photo and spectra in future.


...

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