Disilane

  • Disilicon Hexahydride
  • Disilicane
  • Disilicoethane
  • Silicoethane
Formula
Si2H6
Structure
Description
Colorless gas with an unpleasant odor.

Registry Numbers and Inventories.
CAS
1590-87-0
EC (EINECS/ELINCS)
216-466-5
UN (DOT)
1954
Merck
12,3419
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
H6Si2
Formula mass
62.22
Melting point, °C
-132.6
Boiling point, °C
-14.3
Vapor pressure, mmHg
2940 (25 C)
Density
0.901 g/cm3
Solubility in water
Insoluble
Heat of vaporization
21.2 kJ/mol

Hazards and Protection.
Storage
Store in well ventilated areas. Keep valve protection cap on cylinders when not in use.
Protection
Protective gloves, clothing and safety glasses.
Small spills/leaks
Evacuate and ventilate area. Shut off source if possible and remove source of heat. Allow leaks to burn themselves out.
Stability
Stable under normal storage conditions.
Incompatibilities
Air, halogens, oxidizing agents.
Decomposition
Silane, hydrogen, SiO2, silicates.

Fire.
Flash Point,°C
0
Fire fighting
Allow to burn. Do not try to extinguish because burning reduces the possibility of explosions of disilane and air mixtures.
Fire potential
Pyrophoric, flammable liquid and gas under pressure. Can ignite on contact with air. May form explosive mixtures with air.
Hazards
Although disilane is pyrophoric, low concentrations may be released without burning. These releases may concentrate resulting in fire or explosion. Cylinder rupture may occur under fire conditions.
Combustion products
Silane, hydrogen, SiO2, silicates.

Health.
Exposure effects
Since disilane is spontaneously flammable in air (liberating silicon dioxide), its toxicological properties are difficult to determine. Inhalation of low concentrations could react with basic solutions in the body liberating silicates and hydrogen. Further, with possible hydrolysis in the body tissues, silicic acid would be formed. Skin contact may cause irritation.

First aid
 
   Inhalation
Immediately remove victim to fresh air. If breathing has stopped, give artificial respiration. If breathing is difficult, give oxygen.
   Skin
Immediately flush with copious amounts of water for at least 15 minutes while removing contaminated clothing.

Transport.
UN number
1954
Response guide
Hazard class
2.1