ICSC 0074 - SULPHUR DIOXIDE

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SULPHUR DIOXIDE

ICSC: 0074
_{October 2006}

Sulfurous oxide
Sulfurous anhydride
Sulfur oxide

CAS No: 7446-09-5
RTECS No: WS4550000
UN No: 1079
EC No: 016-011-00-9

(cylinder)
SO₂
Molecular mass: 64.1

TYPES OF HAZARD / EXPOSURE	ACUTE HAZARDS / SYMPTOMS	PREVENTION	FIRST AID / FIRE FIGHTING
FIRE	Not combustible. Heating will cause rise in pressure with risk of bursting.		In case of fire in the surroundings: use appropriate extinguishing media.
EXPLOSION			In case of fire: cool cylinder by spraying with water but avoid contact of the substance with water. Combat fire from a sheltered position.

EXPOSURE		STRICT HYGIENE!	IN ALL CASES CONSULT A DOCTOR!
Inhalation	Cough. Shortness of breath. Sore throat. Laboured breathing.	Ventilation, local exhaust, or breathing protection.	Fresh air, rest. Artificial respiration may be needed. Refer for medical attention.
Skin	ON CONTACT WITH LIQUID: FROSTBITE.	Cold-insulating gloves.	ON FROSTBITE: rinse with plenty of water, do NOT remove clothes. Refer for medical attention.
Eyes	Redness. Pain.	Safety goggles face shield or eye protection in combination with breathing protection.	First rinse with plenty of water (remove contact lenses if easily possible). Refer for medical attention.
Ingestion

SPILLAGE DISPOSAL

PACKAGING & LABELLING

Evacuate danger area! Personal protection: complete protective clothing including self-contained breathing apparatus. Consult an expert! Ventilation. NEVER direct water jet on liquid.

EU classification
T Symbol
R: 23-34
S: (1/2-)9-26-36/37/39-45
Note: 5
UN classification
UN Hazard Class: 2.3
UN Subsidiary Risks: 8
GHS classification
Signal: Warning
Cylinder-Skull-Excl mark-Enviro
Contains refrigerated gas; may cause cryogenic burns or injury
Toxic if inhaled
Causes eye irritation
Causes damage to respiratory tract if inhaled
Causes damage to respiratory tract through prolonged or repeated exposure if inhaled
Harmful to aquatic life

EMERGENCY RESPONSE	SAFE STORAGE
Transport Emergency Card: TEC (R)-20S1079 or 20G2TC NFPA Code: H 3; F 0; R 0	Ventilation along the floor. Dry.

IMPORTANT DATA

Physical State; Appearance
COLOURLESS GAS OR COMPRESSED LIQUEFIED GAS, WITH PUNGENT ODOUR.

Physical dangers
The gas is heavier than air.

Chemical dangers
The solution in water is a medium strong acid. Reacts violently with sodium hydride. Attacks plastic.

Occupational exposure limits
TLV: 2 ppm as TWA, 5 ppm as STEL; A4 (not classifiable as a human carcinogen); (ACGIH 2006).
MAK: 0.5 ppm, 1.3 mg/m³; Peak limitation category: I(1); Pregnancy risk group: C; (DFG 2006).

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
Rapid evaporation of the liquid may cause frostbite. The substance is irritating to the eyes and the respiratory tract. Inhalation may cause asthma-like reactions.

Effects of long-term or repeated exposure
Repeated or prolonged inhalation exposure may cause asthma.

PHYSICAL PROPERTIES	ENVIRONMENTAL DATA
Boiling point: -10°C Melting point: -75.5°C Relative density (water = 1): 1.4 at -10°C (liquid) Solubility in water, ml/100 ml at 25°C: 8.5 Vapour pressure, kPa at 20°C: 330 Relative vapour density (air = 1): 2.25	The substance is harmful to aquatic organisms.

NOTES

Depending on the degree of exposure, periodic medical examination is suggested.
The symptoms of asthma 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.
Anyone who has shown symptoms of asthma due to this substance should avoid all further contact.
Do NOT spray water on leaking cylinder (to prevent corrosion of cylinder).
Turn leaking cylinder with the leak up to prevent escape of gas in liquid state.

IPCS
International
Programme on
Chemical Safety

Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2006

LEGAL NOTICE

Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.

Updated by AS. Approved by GS. Last update: 29.01.2008