ICSC 0576 - TETRAFLUOROSILANE

[List of Chemicals] [Risk Notes] [Risk Phrases] [Safety Phrases] [Danger Symbols]

TETRAFLUOROSILANE

ICSC: 0576
_{April 1997}

Silicon tetrafluoride
Silicon fluoride
Perfluorosilane

CAS No: 7783-61-1
RTECS No: VW2327000
UN No: 1859

(cylinder)
SiF₄
Molecular mass: 104.1

TYPES OF HAZARD / EXPOSURE	ACUTE HAZARDS / SYMPTOMS	PREVENTION	FIRST AID / FIRE FIGHTING
FIRE	Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.		NO water. In case of fire in the surroundings: powder, carbon dioxide.
EXPLOSION			In case of fire: cool cylinder by spraying with water but avoid contact of the substance with water.

EXPOSURE		AVOID ALL CONTACT!
Inhalation	Sore throat. Cough. Burning sensation. Shortness of breath. Laboured breathing. Symptoms may be delayed (see Notes).	Ventilation, local exhaust, or breathing protection.	Fresh air, rest. Half-upright position. Refer for medical attention.
Skin	Redness. ON CONTACT WITH LIQUID: FROSTBITE.	Cold-insulating gloves. Protective clothing.	Rinse skin with plenty of water or shower. Refer for medical attention.
Eyes	Redness.	Safety goggles or eye protection in combination with breathing protection.	First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
Ingestion

SPILLAGE DISPOSAL	PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Ventilation. Personal protection: chemical protection suit including self-contained breathing apparatus.	UN Hazard Class: 2.3 UN Subsidiary Risks: 8	Do not transport with food and feedstuffs.

EMERGENCY RESPONSE	SAFE STORAGE
Transport Emergency Card: TEC (R)-20G1TC NFPA Code: H3; F0; R2; W	Fireproof. Keep in a well-ventilated room.

IMPORTANT DATA

Physical State; Appearance
COLOURLESS GAS, WITH PUNGENT ODOUR.

Physical dangers
The gas is heavier than air.

Chemical dangers
The substance decomposes on heating producing toxic and corrosive fumes including hydrogen fluoride (see ICSC 0283). Reacts with water to form hydrogen fluoride and silicic acid. Attacks many metals in presence of water releasing hydrogen.

Occupational exposure limits
TLV: (fluorides, as F) 2.5 mg/m³ as TWA; A4 (not classifiable as a human carcinogen); BEI issued (ACGIH 2005).
MAK: (Inhalable fraction) 1 mg/m³; Peak limitation category: II(4); skin absorption (H); Pregnancy risk group: C; (DFG 2005).

Routes of exposure
The substance can be absorbed into the body by inhalation.

Inhalation risk
A harmful concentration of this gas in the air will be reached very quickly on loss of containment.

Effects of short-term exposure
The substance is corrosive to the eyes, the skin and the respiratory tract. Inhalation of this gas may cause lung oedema (see Notes). The effects may be delayed. Medical observation is indicated.

PHYSICAL PROPERTIES	ENVIRONMENTAL DATA
Sublimation point: -95.7°C Solubility in water: reaction Relative vapour density (air = 1): 3.6

NOTES

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 is therefore essential.
Immediate administration of an appropriate inhalation therapy by a doctor or a person authorized by him/her, should be considered.
Card has been partly updated in October 2005. See sections Occupational Exposure Limits, Emergency Response.

IPCS
International
Programme on
Chemical Safety

Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004

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