Amyltrichlorosilane

  • Pentyl trichlorosilane
  • Trichloropentylsilane
Formula
C5H11Cl3Si
Structure
Description
A colorless to yellow liquid with a pungent odor.
Uses
Intermediate for silicones.

Registry Numbers and Inventories.
CAS
107-72-2
EC (EINECS/ELINCS)
203-515-0
RTECS
VV4725000
RTECS class
Organometallic; Primary Irritant
UN (DOT)
1728
Beilstein/Gmelin
1737947
Beilstein Reference
4-04-00-04249
Swiss Giftliste 1
G-2129
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C5H11Cl3Si
Formula mass
205.60
Boiling point, °C
166 - 169
Vapor pressure, mmHg
2.1 (25 C)
Vapor density (air=1)
7.1
Density
1.132 g/cm3 (20 C)
Solubility in water
Reacts
Surface tension
20 g/s2
Refractive index
1.4385 (20 C)
Partition coefficient, pKow
6.32
Heat of vaporization
38.9 kJ/mol
Heat of combustion
-2972 kJ/mol

Hazards and Protection.
Storage
All containers, pipes, apparatus, installations and structures used for mfr, storage, transport or use of these substances must be of material resistant to corrosive substances or be protected by suitable coatings. All containers or receptacles should be clearly labelled to indicate their contents and should bear danger symbol for corrosives.
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 protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Use water spray to knock-down vapors. Do not use water on material itself. Neutralize spilled material with crushed limestone, soda ash, or lime. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Dike surface flow using soil, sand bags, foamed polyurethane, or foamed concrete. Absorb bulk liquid with fly ash, cement powder, or commercial sorbents. Water spill: Use natural barriers or oil spill control booms to limit spill travel. Remove trapped material with suction hoses.
Stability
Readily hydrolyzed by moisture with liberation of hydrogen chloride.
Incompatibilities
Reacts vigorously with water to generate toxic hydrogen chloride gas (hydrochloric acid). With a little ammonia, it forms a self-igniting product. Chlorosilanes extreme caution is necessary when handling silane in systems with halogenated compounds, as a trace of free halogen may cause violent explosion.
Decomposition
When heated to decomposition it emits toxic fumes of hydrogen chloride.

Fire.
Flash Point,°C
67
Fire fighting
Use dry chemical, dry sand, or carbon dioxide. Do not use water on material itself. If large quantities of combustibles are involved, use water in flooding quantities as spray and fog. Use water spray to knock-down vapors. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
Certain strong corrosives may, on contact with organic matter or other chemicals, cause fire. Corrosive substances self-ignites in air. With a little ammonia, it forms a self-igniting product.
Hazards
Vapors form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapors may travel to source of ignition and flash back. Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff.
Combustion products
Irritating hydrogen chloride and toxic phosgene may be formed.
Health
3
 
Flammability
2
 
 
Reactivity
2
 
 
Special
W

Health.
Poison_Class
4
Exposure effects
   Ingestion
Gastrointestinal tissue corrosion was observed in animals given single oral doses and may occur in humans following ingestion.
   Inhalation
Three cases of permanently disabling reactive airway syndrome have been reported in adults exposed for several hours to fumes of sodium hydroxide, trichlorosilane, and silicon tetrachloride.
   Skin
The application of chlorosilanes to shaved rabbit skin produced various degrees of irritation. Complete denaturation and tissue sloughing occurred within one minute after exposure to dichlorodimethylsilane, within two to three minutes after exposure to methyltrichlorosilane, ethyltrichlorosilane, and dichlorodiethylsilane, and within 10 minutes after exposure to tetrachlorosilane.
   Eyes
Severe ocular irritation may occur. Rats exposed to vapors developed nasal discharge, tearing,salivation, and pulmonary irritation.

First aid
 
   Ingestion
Dilution: immediately dilute with 4 to 8 ounces (120 to 240 ml) of milk or water (not to exceed 4 ounces/120 ml in a child). Do not induce vomiting.
   Inhalation
Remove from exposure; support respiration.
   Skin
Flush with water.
   Eyes
Flush with water for 15 min.

Transport.
UN number
1728
Response guide
Hazard class
8
PRTC
T
Packing Group
II
 
USCG CHRIS Code
ATS
 
Std. Transport #
4934210