Silicon tetrachloride

  • Silicon chloride
  • Silicon(IV) chloride
Formula
SiCl4
Structure
Description
Silicon tetrachloride is a colorless, fuming liquid with a pungent odor.
Uses
Producing smokescreens in warfare.

Registry Numbers and Inventories.
CAS
10026-04-7
EC (EINECS/ELINCS)
233-054-0
EC Index Number
014-002-00-4
EC Class
Reacts violently with water; Irritant
R 14 35 37
S 7/9 26 36/37/39 45
RTECS
VW0525000
RTECS class
Primary Irritant
UN (DOT)
1818
Merck
12,8644
Beilstein/Gmelin
2303 (G)
Swiss Giftliste 1
G-2850
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
Cl4Si
Formula mass
169.89
Melting point, °C
-70
Boiling point, °C
57.6
Vapor pressure, mmHg
230 (25 C)
Vapor density (air=1)
7.59
Critical temperature
244,7
Critical pressure
36.8
Density
1.48 g/cm3 (20 C)
Solubility in water
Decomposes
Surface tension
19.6 g/s2
Dielectric constant
2.248 (20 C)
Partition coefficient, pKow
5.20
Heat of fusion
7.7 kJ/mol
Heat of vaporization
28.7 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry place. Store in a tightly closed container. Keep under a nitrogen blanket.
Handling
Wash thoroughly after handling. Use only in a well ventilated area. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation. Do not allow contact with water.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Do not expose spill to water.
Disposal code
24
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Metals, strong acids, strong bases, glass.
Decomposition
Hydrogen chloride, carbon monoxide, carbon dioxide, silicon oxide.

Fire.
Flash Point,°C
-18
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Water Reactive. Material will react with water and may release a flammable and/or toxic gas. Substance is noncombustible. Extinguishing media: DO NOT USE WATER! For small fires, use carbon dioxide, dry chemical, dry sand, or alcohol-resistant foam.
Fire potential
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
Hazards
Contact with water in foam applied to adjacent fires will produce irritating fumes of hydrogen chloride.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.
Health
3
 
Flammability
0
 
 
Reactivity
2
 
 
Special
W

Health.
Poison_Class
2
Exposure effects
   Ingestion
May cause burns to the digestive tract.
   Inhalation
May cause respiratory tract irritation. Causes chemical burns to the respiratory tract.
   Skin
Contact with skin causes irritation and possible burns, especially if the skin is wet or moist.
   Eyes
Contact with eyes may cause severe irritation, and possible eye burns.

First aid
 
   Ingestion
Do NOT induce vomiting and seek IMMEDIATE MEDICAL ADVICE.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen.
   Skin
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
1818
Response guide
Hazard class
8
PRTC
T
Packing Group
II
 
USCG CHRIS Code
STC
 
HS Code
2812 10 99
 
Std. Transport #
4932370