|ICSC: 1202 (December 2022)
Sulphuric (acid) anhydride
| CAS #: 7446-11-9
| UN #: 1829
|EC Number: 231-197-3
|FIRE & EXPLOSION
|Not combustible. Gives off irritating or toxic fumes (or gases) in a fire. Many reactions may cause fire or explosion. Heating will cause rise in pressure with risk of bursting. See Notes. Risk of fire and explosion on contact with bases, combustible substances, reducing agents, water or organic materials.
|NO contact with incompatible substances. See Chemical Dangers.
|NO water. In case of fire in the surroundings, use appropriate extinguishing media. In case of fire: keep drums, etc., cool by spraying with water. NO direct contact with water.
|PREVENT GENERATION OF MISTS! AVOID ALL CONTACT! IN ALL CASES CONSULT A DOCTOR!
|Cough. Sore throat. Burning sensation. Shortness of breath. Laboured breathing.
|Use ventilation, local exhaust or breathing protection.
|Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer immediately for medical attention.
|Redness. Pain. Blisters. Serious skin burns.
|Protective gloves. Protective clothing. Apron.
|Wear protective gloves when administering first aid. First rinse with plenty of water for at least 15 minutes, then remove contaminated clothes and rinse again. Refer immediately for medical attention .
|Redness. Pain. Severe burns.
|Wear face shield or eye protection in combination with breathing protection.
|Rinse with plenty of water for several minutes (remove contact lenses if easily possible). Refer immediately for medical attention.
|Burns in mouth and throat. Burning sensation behind the breastbone. Abdominal pain. Vomiting. Shock or collapse.
|Do not eat, drink, or smoke during work.
|Rinse mouth. Give nothing to drink. Do NOT induce vomiting. Refer immediately for medical attention.
|CLASSIFICATION & LABELLING
|Evacuate danger area! Consult an expert! Personal protection: chemical protection suit including self-contained breathing apparatus. Do NOT let this chemical enter the environment. Do NOT wash away into sewer. Ventilation. Collect leaking liquid in covered containers. Absorb remaining liquid in dry sand or inert absorbent. Do NOT absorb in saw-dust or other combustible absorbents. Then store and dispose of according to local regulations.
According to UN GHS CriteriaCauses severe skin burns and eye damage
May cause respiratory irritation
May be corrosive to metals
|Refer to the manufacturer's instructions for proper storage conditions. Dry. Well closed. Store only in original packaging. Separated from food and feedstuffs and incompatible materials. See Chemical Dangers. Store only if stabilized.
Put breakable packaging into closed unbreakable container.
Do not transport with food and feedstuffs.
|PHYSICAL & CHEMICAL INFORMATION
Physical State; Appearance
|EXPOSURE & HEALTH EFFECTS
Routes of exposure
Effects of short-term exposure
Effects of long-term or repeated exposure
|OCCUPATIONAL EXPOSURE LIMITS
|The substance is harmful to aquatic organisms.
|The substance is liquid or solid, depending on the composition. The alpha- and beta-forms appear as asbestos-like needles. Molten sulfur trioxide exists only in the gamma-form and condenses when cooling down forming solid, ice-like gamma-sulfur trioxide. This slowly converts to alpha- and beta-sulfur trioxide when stored for a long time.
When the alpha form melts it takes the gamma form, and vapor pressure rises dramatically with a hazard of explosion.
Boiling point is for the gamma form.
Other melting points: 62°C (alpha form), 33°C (beta form), 17°C (gamma form).
Vapour pressure is 9.7, 45.9 and 57.7 kPa at 25°C for alpha, beta and gamma forms.
NEVER pour water into this substance; when dissolving or diluting always add it slowly to the water.
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.
IARC considers mists of strong inorganic acid to be carcinogenic (group 1). However there is no information available on the carcinogenicity of other physical forms of this substance. Therefore no classification for carcinogenicity under GHS has been applied.
|All rights reserved. The published material is being distributed without warranty of any kind, either expressed or implied. Neither ILO nor WHO nor the European Commission shall be responsible for the interpretation and use of the information contained in this material.