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ASBESTOS CEILING TILES, Asbestos-Containing
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ROOF ICE DAM LEAKS
BASEMENT HEAT LOSS
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CEILING FINISHES INTERIOR
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CHINESE DRYWALL HAZARDS
DEW POINT CALCULATION for WALLS
EFFLORESCENCE, Salts & White / Brown Deposits
FIBERGLASS INSULATION MOLD
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FLOOR TILES ASBESTOS
FLOOR TYPES & DEFECTS
HEAT LOSS in BUILDINGS
HOUSE DOCTOR, how-to be
HUMIDITY LEVEL TARGET
ROOF ICE DAM LEAKS
INDOOR AIR QUALITY IMPROVEMENT GUIDE
INSULATION FACT SHEET- DOE
INSULATION IDENTIFICATION GUIDE
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METAL LATH, PLASTER & STUCCO
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MOISTURE CONTROL in BUILDINGS
MOLD: A COMPLETE GUIDE TO MOLD
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NOISE / SOUND DIAGNOSIS & CURE
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STRUCTURAL DAMAGE PROBING
SWEATING (CONDENSATION) on PIPES, TANKS
Thermal Expansion Cracking of Brick
THERMAL EXPANSION of MATERIALS
THERMAL IMAGING, THERMOGRAPHY
THERMAL MASS in BUILDINGS
THERMAL TRACKING Indicates Heat Loss
VAPOR BARRIERS & CONDENSATION in BUILDINGS
VENTILATION in BUILDINGS
VINYL CHLORIDE HEALTH INFO
VOCs VOLATILE ORGANIC COMPOUNDS
WALL CONSTRUCTION BARRIER vs CAVITY
WATER ENTRY in buildings
WINDOWS & DOORS
WINTERIZE A BUILDING
WOOD Burning Heaters Fireplaces Stoves
WORLD TRADE CENTER 9-11 DUST PHOTOS
Asbestos particles examined by microscope: photographs provided on this page illustrate what asbestos fibers or fragments may look like under the polarized light microscope. In this article we provide photographs and descriptive text of asbestos insulation and other asbestos-containing products to permit identification of definite, probable, or possible asbestos materials in buildings. This document assists forensic investigators, laboratories, building buyers, owners or inspectors who need to identify asbestos materials (or probable-asbestos) in buildings by simple visual inspection and confirmed by asbestos test lab or forensic microscopy lab examination.
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While an expert lab test using polarized light microscopy may be needed to identify the specific type of asbestos fiber, or to identify the presence of asbestos in air or dust samples, many asbestos-containing building products not only are obvious and easy to recognize, but since there were not other look-alike products that were not asbestos, a visual identification of this material can be virtually a certainty in many cases.
Our photo (left) illustrates pure tremolite asbestos used as fireproofing on a building ceiling in New York. Our forensic lab photographs of tremolite asbestos (below) were collected from that ceiling. More about this building can be read at ASBESTOS FIREPROOFING SPRAY-On Coatings.
Also see ASBESTOS DUCTS, HVAC a field identification guide to visual detection of asbestos in and on heating and cooling system ducts and flue vents, and see Micro-Photographs of Dust from the World Trade Center collapse following the 9/11/01 attack. Links to U.S. government and other authoritative research and advice are included.
Here are two photographs showing what a sample of asbestos ceiling fireproofing (tremolite asbestos) looks like in our lab microscope using polarized light microscopy (PLM). Notice that in the first photo you see long very thin multi-fibrous filaments - asbestiform tremolite.
Each filament is less than one micron in diameter. In the second photograph you'll observe non-fibrous granular particles, many less than one micron in diameter as well - non-asbestiform tremolite. [McCrone]
This asbestos sample was collected from slabs of nearly pure tremolite asbestos which was used as FIREPROOFING ASBESTOS SPRAY-ON in a commercial building.
McCrone illustrated that tremolite asbestos (as well as some other forms of asbestos) occur in both fibrous and non-fibrous form. Comparing the photo at below left (tremolite in fibrous form) by McCrone to ours (above right) that shows fewer small non-fibrous particles, but a clear bundle of ultra-fine sub-micron (in width) fibers.
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