METHYL DICHLOROSILANE

ICSC: 0297

METHYL DICHLOROSILANE
Dichloromethylsilane
Monomethyldichlorosilane
CH₄Cl₂Si/CH₃SiHCl₂
Molecular mass: 115.0
CAS # 75-54-7
RTECS # VV3500000
ICSC # 0297
UN # 1242

TYPES OF HAZARD/ EXPOSURE	ACUTE HAZARDS/ SYMPTOMS	PREVENTION	FIRST AID/ FIRE FIGHTING
FIRE	Highly flammable. Gives off irritating or toxic fumes (or gases) in a fire.	NO open flames, NO sparks, and NO smoking. NO contact with hot surfaces.	Powder, carbon dioxide. NO hydrous agents. NO water.
EXPLOSION	Vapour/air mixtures are explosive.	Closed system, ventilation, explosion-proof electrical equipment and lighting. Do NOT use compressed air for filling, discharging, or handling.	In case of fire: cool drums, etc., by spraying with water but avoid contact of the substance with water.

EXPOSURE		AVOID ALL CONTACT!
INHALATION		Local exhaust or breathing protection.	Fresh air, rest. Refer for medical attention.
SKIN	Pain.	Protective gloves.	First rinse with plenty of water, then remove contaminated clothes and rinse again. Refer for medical attention.
EYES	Redness. Pain.	Safety spectacles.	First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
INGESTION	Sore throat.	Do not eat, drink, or smoke during work.	Rinse mouth. Do NOT induce vomiting. Refer for medical attention.

SPILLAGE DISPOSAL

STORAGE

PACKAGING & LABELLING

Evacuate danger area! Consult an expert! Collect leaking liquid in sealable dry, plastic containers. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Do NOT wash away into sewer. NEVER direct water jet on liquid (extra personal protection: complete protective clothing including self-contained breathing apparatus).

Fireproof. Separated from oxidants, food and feedstuffs, incompatible substances (see Chemical Dangers). Cool. Dry. Well closed. Keep under inert gas.

Airtight. Unbreakable packaging; put breakable packaging into closed unbreakable container. Do not transport with food and feedstuffs.
UN Hazard Class: 4.3
UN Subsidiary Risks: 3 and 8
UN Packing Group: I

SEE IMPORTANT INFORMATION ON BACK

ICSC: 0297

Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities © IPCS CEC 1993

International Chemical Safety Cards

METHYL DICHLOROSILANE

ICSC: 0297

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PHYSICAL STATE; APPEARANCE:
COLOURLESS LIQUID , WITH PUNGENT ODOUR.

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

CHEMICAL DANGERS:
The substance may spontaneously ignite on contact with air and in the presence of potassium permanganate, lead(II) oxide, copper oxide or silver oxide, even under an inert gas. On contact with hot surfaces or flames this substance decomposes forming toxic and corrosive fumes including chloride and phosgene. The substance decomposes on contact with alkaline compounds producing highly flammable hydrogen gas. Reacts violently with oxidants. Reacts violently with water to form corrosive hydrochloric acid (see ICSC # 0163). Attacks many metals in presence of water.

OCCUPATIONAL EXPOSURE LIMITS (OELs):
TLV not established.

ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its vapour.

INHALATION RISK:
A harmful contamination of the air can be reached rather quickly on evaporation of this substance at 20°C on spraying/dispersing (however) much faster.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance is corrosive to the eyes, the skin and the respiratory tract. Inhalation of the vapour may cause lung oedema (see Notes). Medical observation is indicated.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:

PHYSICAL
PROPERTIES

Boiling point: 41°C
Melting point: -91°C
Relative density (water = 1): 1.1
Solubility in water: reaction
Vapour pressure, kPa at 20°C: 47.1

Relative vapour density (air = 1): 3.97
Flash point: -16°C c.c.
Auto-ignition temperature: 290°C
Explosive limits, vol% in air: 2.4-55

ENVIRONMENTAL
DATA

This substance may be hazardous to the environment; special attention should be given to water organisms.

N O T E S

Reacts violently with fire extinguishing agents such as water and foam. The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation are therefore essential. Immediate administration of an appropriate spray, by a doctor or a person authorized by him/her, should be considered.

Transport Emergency Card: TEC (R)-906
NFPA Code: H3; F3; R2; W

ADDITIONAL INFORMATION

ICSC: 0297	METHYL DICHLOROSILANE
© IPCS, CEC, 1993

IMPORTANT LEGAL NOTICE:

Neither the CEC or the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use.