Orthophosphoric acid
H3O4P / H3PO4
Molecular mass: 98.0
ICSC # 1008
CAS # 7664-38-2
RTECS # TB6300000
UN # 1805
EC # 015-011-00-6
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Not combustible.
Gives off irritating or toxic fumes (or gases) in a fire.
See Notes.
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In case of fire in the surroundings: use appropriate extinguishing media.
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Explosion
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Exposure
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PREVENT GENERATION OF MISTS!
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•Inhalation
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Burning sensation.
Cough.
Shortness of breath.
Sore throat.
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Ventilation.
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Fresh air, rest.
Refer for medical attention.
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•Skin
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Redness.
Pain.
Skin burns.
Blisters.
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Protective gloves.
Protective clothing.
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Remove contaminated clothes.
Rinse skin with plenty of water or shower.
Refer for medical attention.
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•Eyes
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Pain.
Redness.
Severe deep burns.
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Safety goggles
or
eye protection in combination with breathing protection.
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First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
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•Ingestion
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Abdominal pain.
Burning sensation.
Shock or collapse.
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Do not eat, drink, or smoke during work.
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Rinse mouth.
Give plenty of water to drink.
Do NOT induce vomiting.
Refer for medical attention.
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Spillage Disposal
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Storage
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Packaging & Labelling
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Sweep spilled substance into covered containers.
Carefully collect remainder,
then remove to safe place.
Chemical protection suit including self-contained breathing apparatus.
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Separated from
food and feedstuffs.
See Chemical Dangers.
Well closed.
Dry.
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Do not transport with food and feedstuffs.
Note: B
C symbol
R: 34
S: 1/2-26-45
UN Hazard Class: 8
UN Packing Group: III
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Important Data
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Physical State; Appearance:
HYGROSCOPIC
,
COLOURLESS
CRYSTALS
.
Physical Dangers:
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/m3 as TWA, 3 mg/m3 as STEL; (ACGIH 2004).
MAK: (Inhalable fraction) 2 mg/m3
Peak limitation category: I(2); Pregnancy risk group: C;
(DFG 2005).
1 mg/m3 (8h), 2 mg/m3 (short term) EC OELs
OSHA PEL: TWA 1 mg/m3
NIOSH REL: TWA 1 mg/m3 ST 3 mg/m3
NIOSH IDLH: 1000 mg/m3 See: 7664382
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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 20°C.
Effects of Short-Term Exposure:
The substance
is corrosive to
the eyes,
the skin
and
the respiratory tract.
Corrosive on ingestion.
Effects of Long-Term or Repeated Exposure:
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Physical
Properties
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Decomposes below boiling point at 213°C
Melting point: 42°C
Density: 1.9
g/cm3
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Solubility in water:
very good
Vapour pressure, Pa at 20°C: 4
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Environmental
Data
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N O T E S
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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.
Transport Emergency Card: TEC (R)-80S1805
NFPA Code: H 2; F 0; R 0;
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ADDITIONAL INFORMATION
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ICSC: 1008
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PHOSPHORIC ACID
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(C) IPCS, CEC, 1994
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IMPORTANT LEGAL NOTICE:
Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH,
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.
The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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