Friday, 12 August 2011 00:34

Silicon & Organosilicon Compounds: Physical & Chemical Hazards

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Chemical Name
CAS-Number

Physical

Chemical

UN Class or Division /  Subsidiary Risks

ETHYL SILICATE
78-10-4

3

METHYL DICHLOROSILANE
75-54-7

4.3/ 3/ 8

METHYL TRICHLOROSILANE
75-79-6

The vapour is heavier than air and may travel along the ground; distant ignition possible

The substance decomposes on heating producing hydrogen chloride • Reacts violently with strong oxidants • Reacts violently with water and moisture producing hydrogen chloride, causing fire and explosion hazard • Attacks metals like aluminium and magnesium

3/ 8

POLYDIMETHYLSILOXANE
9016-00-6

The substance decomposes on heating (>150 ºC) producing formaldehyde in small amounts

SILANE, DICHLORO-
4109-96-0

The gas is heavier than air

Reacts violently with water • On contact with air it emits hydrogen chloride

SILICIC ACID, DISODIUM SALT
6834-92-0

The substance is a strong base, it reacts violently with acid and is corrosive in moist air to metals like zinc, aluminium, tin and lead forming a flammable/explosive gas (hydrogen)

SILICON TETRAHYDRIDE
7803-62-5

The gas is heavier than air

The substance may spontaneously ignite on contact with air room temperature

SILICON TETRAFLUORIDE
7783-61-1

The gas is heavier than air

Reacts violently with water • On contact with air it emits hydrogen fluoride

2.3/ 8

SILICON
7440-21-3

4.1

TETRACHLOROSILANE
10026-04-7

The vapour is heavier than air

Reacts violently with water • On contact with air it emits hydrogen chloride and silicic acid

TRICHLOROSILANE
10025-78-2

The vapour is heavier than air and may travel along the ground; distant ignition possible

Reacts violently with water • On contact with air it emits hydrogen chloride • Attacks many metals in presence of water

4.3/ 3/ 8

TRIMETHYLCHLOROSILANE
75-77-4

The vapour is heavier than air and may travel along the ground; distant ignition possible

The substance decomposes on heating producing toxic and corrosive fumes (hydrogen chloride, phosgene) • Reacts violently with water, ketones, alcohol, amines and many other substances, causing explosion hazard • On contact with air it emits corrosive fumes of hydrogen chloride

3/ 8

For UN Class: 1.5 = very insensitive substances which have a mass explosion hazard; 2.1 = flammable gas; 2.3 = toxic gas; 3 = flammable liquid; 4.1 = flammable solid; 4.2 = substance liable to spontaneous combustion; 4.3 = substance which in contact with water emits flammable gases; 5.1 = oxidizing substance; 6.1 = toxic; 7 = radioactive; 8 = corrosive substance

 

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