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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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Contents

Preface
Part I. The Body
Part II. Health Care
Part III. Management & Policy
Part IV. Tools and Approaches
Part V. Psychosocial and Organizational Factors
Part VI. General Hazards
Part VII. The Environment
Part VIII. Accidents and Safety Management
Part IX. Chemicals
Part X. Industries Based on Biological Resources
Part XI. Industries Based on Natural Resources
Part XII. Chemical Industries
Part XIII. Manufacturing Industries
Part XIV. Textile and Apparel Industries
Part XV. Transport Industries
Part XVI. Construction
Part XVII. Services and Trade
Part XVIII. Guides