Chrysotile

  • White asbestos
  • Serpentine chrysotile
Formula
Mg3H4Si2O9
Description
White asbestos is a slender, fine, flaxy fiber.
Uses
In cement products, floor tile, paper products, paintermediate & caulking, textiles, plastics.

Registry Numbers and Inventories.
CAS
12001-29-5
EC Index Number
650-013-00-6
RTECS
CI6478500
RTECS class
Tumorigen; Mutagen; Human Data; Natural Product
UN (DOT)
2590
Beilstein/Gmelin
166724 (G)
Austrailia AICS
Listed
New Zealand
Listed

Properties.
Formula
H4Mg3O9S2
Formula mass
277.11
Decomposition point, °C
800-850
Density
2.55 g/cm3 (20 C)
Solubility in water
Insoluble
Refractive index
1.532 - 1.544
Dielectric constant
800 )800 C)

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate clothing to prevent any reasonable probability of skin contact. Wear eye protection to prevent any possibility of eye contact.
Respirators
At concentrations above the NIOSH rel, or where there is no rel, at any detectable concentration: respirator class(es): any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive pressure-mode. Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained breathing apparatus operated in pressure-demand or other positive-pressure mode.
Small spills/leaks
Keep material out of water sources and sewers. Land spill: Cover solids with a plastic sheet to prevent dissolving in rain or fire fighting water. Dike surface flow using soil, sand bags, foamed polyurethane, or foamed concrete. Water spill: Use natural deep water pockets, excavated lagoons, or sand bag barriers to trap material at bottom. Remove trapped material with suction hoses.
Stability
No data.
Incompatibilities
Organic acids have a tendency to react slowly with chrysotile. Because the outer surface of a chrysotile fiber is essentially composed of magnesium hydroxide (brucite), chrysotile is highly susceptible to acid attack.
Decomposition
It is almost completely destroyed within 1 hour in 1 N hydrochloric acid at 95 C.

Fire.
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Keep run-off water out of sewers and water sources.
Fire potential
May burn but does not ignite readily.
Hazards
Some may burn but none ignite readily. May polymerize explosively when heated or involved in a fire. Containers may explode when heated. Some may be transported hot.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure limit(s)
TLV: 2 fibres/cc (as TWA) A1 ppm; mg/m3 (ACGIH 1992-1993). MAK: class III A1 (1993).
Carcinogin
O, G-A1, I-1, N-1
Exposure effects
The toxological properties of this substance have not been fully investigated.
   Inhalation
Asbestosis - is defined as a diffuse bilateral interstitial fibrosis primarily affecting the lower 2/3 of the lung. Signs and symptoms include breathlessness on effort, finger clubbing, clicking, and rales.
   Skin
Benign nodules called asbestos corns develop around implanted fibers.
   Eyes
See Skin.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Administer oxygen if breathing is difficult.
   Skin
Remove and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes.
   Eyes
Immediately flush with running water for at least 20 minutes.

Transport.
UN number
2590
Response guide
Hazard class
9
Packing Group
III
 
Std. Transport #
4945706 4945708