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PHOSPHORIC ACID ICSC: 1008
Date of Peer Review: October 2000

Orthophosphoric acid
CAS # 7664-38-2 H3O4P / H3PO4
RTECS # TB6300000 Molecular mass: 98.0
UN # 1805
EC Index # 015-011-00-6
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. See Notes.

In case of fire in the surroundings: use appropriate extinguishing media.
EXPLOSION


EXPOSURE
PREVENT GENERATION OF MISTS!

Inhalation Burning sensation. Cough. Shortness of breath. Sore throat.
Ventilation.
Fresh air, rest. Refer for medical attention.
Skin Redness. Pain. Skin burns. Blisters.
Protective gloves. Protective clothing.
Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention.
Eyes Pain. Redness. Severe deep burns.
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 Abdominal pain. Burning sensation. Shock or collapse.
Do not eat, drink, or smoke during work.
Rinse mouth. Give plenty of water to drink. Do NOT induce vomiting. Refer for medical attention.
SPILLAGE DISPOSAL PACKAGING & LABELLING
Sweep spilled substance into covered containers. Carefully collect remainder, then remove to safe place. Chemical protection suit including self-contained breathing apparatus.
Do not transport with food and feedstuffs.
EU Classification
Symbol: C
R: 34
S: (1/2-)-26-45
Note: [B]
UN Classification
UN Hazard Class: 8
UN Pack Group: III
EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-80S1805
NFPA Code: H 2; F 0; R 0;
Separated from food and feedstuffs. See Chemical Dangers. Well closed. Dry.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 2005

SEE IMPORTANT INFORMATION ON BACK
PHOSPHORIC ACID ICSC: 1008
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
HYGROSCOPIC, COLOURLESS CRYSTALS.

CHEMICAL DANGERS:
The substance violently polymerizes under the influence of azo compounds and epoxides. On combustion, forms toxic fumes (phosphorous oxides). The substance decomposes on contact with alcohols, aldehydes, cyanides, ketones, phenols, esters, sulfides, halogenated organics producing toxic fumes. Attacks many metals forming flammable/explosive gas (hydrogen - see ICSC 0001). The substance is a medium strong acid. Reacts violently with bases.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 1 mg/m as TWA, 3 mg/m as STEL; (ACGIH 2004).
MAK: (Inhalable fraction) 2 mg/m; Peak limitation category: I(2); Pregnancy risk group: C; (DFG 2005).
1 mg/m (8h), 2 mg/m (short term) EC OELs
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its aerosol and by ingestion.

INHALATION RISK:
A harmful contamination of the air will not or will only very slowly be reached on evaporation of this substance at 20C.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance is corrosive to the eyes, the skin and the respiratory tract. Corrosive on ingestion.

PHYSICAL PROPERTIES
Decomposes below boiling point at 213C
Melting point: 42C
Density: 1.9 g/cm
Solubility in water: very good
Vapour pressure, Pa at 20C: 4
ENVIRONMENTAL DATA

NOTES
NEVER pour water into this substance; when dissolving or diluting always add it slowly to the water. Card has been partly updated in October 2005. See sections Occupational Exposure Limits, Emergency Response.
ADDITIONAL INFORMATION


LEGAL NOTICE Neither the CEC nor 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
IPCS, CEC 2005