Customer Service

 Customer Survey

LABConnect™ - Online Results & More

Chrysotile Asbestos

Chrysotile Asbestos

Chemical formula: Mg3[Si2O5](OH)4

Source: Quebec, California, Vermont, Soviet Union, and the Italian Alps


Chrysotile, also known as “white asbestos”, is one of three main members of the serpentine mineral group. The other two, lizardite and antigorite, although more abundant in nature are not regulated minerals. The serpentines are typically found in metamorphic rock.

Chrysotile is by far the most commonly used asbestos type and accounts for approximately 95% of asbestos found in U.S. buildings. In some asbestos mines the fibers are quite long making it conducive to weaving into fire and heat resistant textiles.

Chrysotile is a hydrous magnesium silicate. It has a layered structure. One layer has linked Silica tetrahedra Si2O5 which bind to a brucite Mg(OH)2 layer at the apical O and OH groups yielding an overall mineral chemistry of close to Mg3Si2O5(OH)4. Because of a mismatch in size of the two layers a curvature develops resulting in tightly wrapped concentric tubes. The resultant fibers are easily separated, strong, and very flexible. The unique internal structure aids in the identification of chrysotile. Although not as acid resistant as the other asbestos types, it has the highest tensile strength.

Chrysotile chemistry is fairly constant although there can be some substitution by Fe and Ni for Mg and Al for some Si. Magnesium replacement by Iron is small but common.

By Polarized Light Microscopy (PLM) chrysotile bundles typically appear curved or even wavy. A common occurrence is the presence of kinks or “knuckles” in the length of the bundle. The splayed or split ends of many bundles give a broomstick appearance. Chrysotile is monoclinic and has a positive sign of elongation. Its ? (gamma) refractive index value is less than 1.58. Individual fibers and even small bundles are beyond the resolution of light microscopy and TEM is often suggested to reduce the chance of false negatives or under estimation. By TEM, chrysotile fibrils display a characteristic internal tube structure and Electron Diffraction pattern, produced by the scrolling of chrysotile's curved sheets of tetrahedral and octahedral layers.


Spray-on insulation, asbestos cement, pipe and boiler insulation, brake linings, fire blankets and other fire proof and fire resistant textiles, roofing felts, mastics, putties and caulks, gaskets and ropes, transite panels and asbestos reinforced plastics (switchboards, insulation boards)

Atlanta, GA (LAB 07) - NVLAP Lab Code 101048-1Baton Rouge, LA (LAB 25) - NVLAP Lab Code 200375-0Beltsville, MD (LAB 19) - NVLAP Lab Code 200293-0Boston, MA (LAB 13) - NVLAP Lab Code 101147-0Buffalo, NY (LAB 14) - NVLAP Lab Code 200056-0Carle Place, NY (LAB 06) - NVLAP Lab Code 101048-10Charlotte, NC (LAB 41) - NVLAP Lab Code 200841-0Chicago, IL (LAB 26) - NVLAP Lab Code 200399-0Cinnaminson, NJ (LAB List in Description) - NVLAP Lab Code 101048-0Dallas, TX (LAB 11) - NVLAP Lab Code 600111-0Denver, CO (LAB 22) - NVLAP Lab Code 200828-0EMSL Canada - Calgary, AB (LAB 65) - NVLAP Lab Code 500100-0EMSL Canada - Edmonton, AB (LAB 50) - NVLAP Lab Code 600321-0EMSL Canada - Markham, ON (LAB 66) - NVLAP Lab Code 600317-0EMSL Canada - Montreal, QC (LAB 68) - NVLAP Lab Code 201052-0EMSL Canada - Ottawa, ON (LAB 67) - NVLAP Lab Code 201040-0EMSL Canada - Toronto, ON (LAB 55) - NVLAP Lab Code 200877-0EMSL Canada - Vancouver, BC (LAB 69) - NVLAP Lab Code 201068-0Fort Lauderdale, FL (LAB 56) - NVLAP Lab Code 500085-0Houston, TX (LAB 15) - NVLAP Lab Code 102106-0Huntington Beach, CA (LAB 33) - NVLAP Lab Code 101384-0Indianapolis, IN (LAB 16) - NVLAP Lab Code 200188-0Kernersville, NC (LAB 02) - NVLAP Lab Code 102104-0Las Vegas, NV (LAB 31) - NVLAP Lab Code 600140-0Long Island City, NY (LAB 03) - NVLAP Lab Code 101048-9Meriden, CT (LAB 24) - NVLAP Lab Code 200700-0Miami, FL (LAB 17) - NVLAP Lab Code 200204-0Minneapolis, MN (LAB 35) - NVLAP Lab Code 200019-0Ontario, California (San Bernadino County / Inland Empire) (LAB 71) - NVLAP Lab Code 600239-0Orlando, FL (LAB 34) - NVLAP Lab Code 101151-0Phoenix, AZ (LAB 12) - NVLAP Lab Code 200811-0Piscataway, NJ (LAB 05) - NVLAP Lab Code 101048-2Plymouth Meeting, PA (LAB 18) - NVLAP Lab Code 200699-0Raleigh, NC (LAB 29) - NVLAP Lab Code 200671-0Rochester, NY (LAB 53) - NVLAP Lab Code 600183-0San Diego, CA (LAB 43) - NVLAP Lab Code 200855-0San Leandro, CA (LAB 09) - NVLAP Lab Code 101048-3Santa Clara, CA (LAB 47) - NVLAP Lab Code 600318-0Seattle, WA (LAB 51) - NVLAP Lab Code 200613-0South Pasadena, CA (LAB 32) - NVLAP Lab Code 200232-0South Portland, ME (LAB 62) - NVLAP Lab Code 500094-0St. Louis, MO (LAB 39) - NVLAP Lab Code 200742-0Syracuse, NY (LAB 73) - NVLAP Lab Code 600283-0Tampa, FL (LAB 93) - NVLAP Lab Code 600215-0
Sorry, this function is disabled.