Product Identification

Product Name

Dichlorodiphenylsilane

Synonyms

Chlorine Control
Chlorine Cure
Declor-It
Dichloro(diphenyl)silane
Dichlorodiphenylsilane
Disodium thiosulfate
S-Hydril
Sodium hyposulfite

CAS

7772-98-7

CAS

80-10-4

Formula

C12H10Cl2Si

Formula

Na2O3S2

Molecular Weight

253.2

Molecular Weight

158.09

EINECS

201-251-0

EINECS

231-867-5

RTECS

VV3190000

RTECS

XN6476000

RTECS Class

Other

RTECS Class

Primary Irritant

Merck

12,8844

Beilstein/Gmelin

12718 (G)

Beilstein/Gmelin

609882

Beilstein Reference

4-16-00-01526

EC Class

harmful, corrosive

Physical and Chemical Properties

Appearance

Colorless liquid. Sharp, hydrochloric acid-like; pungent.

Appearance

White, odorless powder.

Solubility in water

Insoluble

Solubility in water

500 g/L

Melting Point

-22

Melting Point

48

Boiling Point

305

Boiling Point

100

Vapor Pressure

0.0015 (25 C)

Density

1.199 g/cm3 (20 C)

Density

1.66 g/cm3

Partition Coefficient

6.69

Heat Of Vaporization

52.4 kJ/mol

Heat Of Combustion

-8406 kJ/mol

Usage

Intermediate for silcone lubricants.

Usage

To remove chlorine from solution, as antichlor in bleaching of paper pulp, fixer in photography, mordant in dyeing & printing textiles, reducer in chrome dyeing, manufacture leather, extracting of silver from ores, bleaching bone, straw, ivory, reagent in analytical chemistry, antidote (cyanide poisoning).

Vapor Density

8.45

Refractive Index

1.5775 (20 C)

First Aid Measures

Ingestion

Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.

Ingestion

If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid.

Inhalation

May cause respiratory tract irritation.

Inhalation

Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration.

Inhalation

Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid if cough or other symptoms appear.

Skin

May cause skin irritation.

Skin

Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists.

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. Wash clothing before reuse. Destroy contaminated shoes.

Eyes

May cause eye irritation and possible burns.

Eyes

Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Eyes

Get medical aid immediately. Do NOT allow victim to rub or keep eyes closed. Extensive irrigation is required (at least 30 minutes).

Handling and Storage

Storage

Keep container closed when not in use. Store in a cool, dry, well-ventilated area away from incompatible substances. Corrosives area. Keep containers tightly closed. Store protected from moisture.

Storage

Store in a cool, dry, well-ventilated area away from incompatible substances. Keep away from strong acids.

Handling

Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with skin and eyes. Keep container tightly closed. Avoid ingestion and inhalation.

Handling

Keep container tightly closed. Do not get on skin or in eyes. Do not ingest or inhale. Use with adequate ventilation. Wash clothing before reuse. Discard contaminated shoes. Keep from contact with moist air and steam.

Hazards Identification

Ingestion

Ingestion of large amounts may cause gastrointestinal irritation.

Ingestion

May cause severe and permanent damage to the digestive tract. Causes gastrointestinal tract burns.

Inhalation

May cause severe irritation of the respiratory tract with sore throat, coughing, shortness of breath and delayed lung edema. Causes chemical burns to the respiratory tract.

Skin

Causes skin burns.

Eyes

Causes eye burns. Contact with liquid or vapor causes severe burns and possible irreversible eye damage.

Hazards

Behavior in fire: Difficult to extinguish; re-ignition may occur. Contact with water or foam applied to adjacent fires will produce irritating hydrogen chloride fumes.

EC Risk Phrase

R 34

EC Safety Phrase

S 26 36/37/39 45

UN (DOT)

1769

Exposure Controls/Personal Protection

Personal 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 minimize contact with skin.

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.

Respirators

A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.

Fire Fighting Measures

Flash Point

132

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water. Substance will react with water (some violently) releasing flammable, toxic, or corrosive gases and runoff. Combustible material; may burn but does not ignite readily. Extinguishing media: For large fires, use water spray, fog, or alcohol-resistant foam. Do NOT get water inside containers. Do NOT use straight streams of water. For small fires, use carbon dioxide, dry chemical, dry sand, or alcohol-resistant foam. Most foams will react with the material and release corrosive/toxic gases.

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Dusts at sufficient concentrations can form explosive mixtures with air. Combustion generates toxic fumes. Extinguishing media: Use water spray, dry chemical, or carbon dioxide.

Fire Potential

Self-ignites in air. With a little ammonia, it forms a self-igniting product. Chlorosilanes certain strong corrosives may, on contact with organic matter or other chemicals, cause fire.

Accidental Release Measures

Small spills/leaks

Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, using the appropriate protective equipment. Remove all sources of ignition. Provide ventilation. Do not get water on spilled substances or inside containers. Use water spray to reduce vapors or divert vapor cloud drift.

Small spills/leaks

Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions.

Stability and Reactivity

Incompatibilities

Sodium nitrite, strong acids, strong oxidizers, water reactive materials. Deliquescent in moist air. Efflorescent in warm dry air.

Stability

Stable under normal temperatures and pressures.

Incompatibilities

Strong oxidizing agents.

Decomposition

Hydrogen chloride, carbon monoxide, carbon dioxide, silicon oxide.

Decomposition

Oxides of sulfur, hydrogen sulfide, sodium oxide.

Combustion Products

Hydrochloric acid and phosgene fumes may be formed.

Transport Information

UN Number

1769

Hazard Class

8

Packing Group

II

HS Code

2931 00 95