TRIMETHYL PHOSPHITE 1556
October 2004
CAS No: 121-45-9 Phophorous acid, trimethyl ester
Trimethoxy phosphine
RTECS No: TH1400000
Methyl phosphite
UN No: 2329
C3H9O3P / (CH3O)3P
Molecular mass: 124.1
TYPES OF
ACUTE HAZARDS/SYMPTOMS PREVENTION FIRST AID/FIRE FIGHTING
HAZARD/
EXPOSURE
FIRE Flammable. Gives off irritating or NO open flames, NO sparks, and NO Foam, carbon dioxide, powder.
toxic fumes (or gases) in a fire. smoking.
EXPLOSION Above 23/C explosive vapour/air Above 23/C use a closed system, In case of fire: cool drums, etc., by
mixtures may be formed. ventilation, and explosion-proof spraying with water but avoid contact
electrical equipment. of the substance with water.
EXPOSURE AVOID EXPOSURE OF
(PREGNANT) WOMEN!
Inhalation Cough. Sore throat. Ventilation, local exhaust, or breathing Fresh air, rest.
protection.
Skin Redness. Pain. Protective gloves. Rinse and then wash skin with water
and soap.
Eyes Redness. Pain. Safety spectacles. First rinse with plenty of water for
several minutes (remove contact
lenses if easily possible), then take to
a doctor.
Ingestion Do not eat, drink, or smoke during Rinse mouth.
work.
SPILLAGE DISPOSAL PACKAGING & LABELLING
Collect leaking and spilled liquid in sealable containers UN Hazard Class: 3
as far as possible. Personal protection: self-contained UN Pack Group: III
breathing apparatus.
EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-30GF1-III Fireproof. Separated from oxidants, strong bases.
NFPA Code: H1; F3; R1
Prepared in the context of cooperation between the International
IPCS Programme on Chemical Safety and the European Commission 漏
IPCS 2005
International
Programme on
SEE IMPORTANT INFORMATION ON THE BACK.
Chemical Safety
1556 TRIMETHYL PHOSPHITE
IMPORTANT DATA
Physical State; Appearance Routes of exposure
COLOURLESS LIQUID, WITH PUNGENT ODOUR. The substance can be absorbed into the body through the skin
and by ingestion.
Chemical dangers
Inhalation risk
On combustion, forms toxic fumes including phosphine and
phosphorous oxides. Reacts with water producing methanol and A harmful contamination of the air can be reached very quickly on
dimethyl phosphite. Reacts with oxidants and strong bases. evaporation of this substance at 20/C.
Reacts with magnesium perchlorate causing explosion hazard.
Effects of short-term exposure
Occupational exposure limits The substance is severely irritating to the eyes and the skin. The
TLV: 2 ppm as TWA; (ACGIH 2004). vapour is irritating to the respiratory tract.
MAK: IIb (not established but data is available); skin absorption
(H); (DFG 2004). Effects of long-term or repeated exposure
Animal tests show that this substance possibly causes toxicity to
human reproduction or development.
PHYSICAL PROPERTIES
Boiling point: 111.5/C Vapour pressure, kPa at 25/C: 3.2
Melting point: -78/C Relative vapour density (air = 1): 4.3
Relative density (water = 1): 1.1 Flash point: 23/C c.c.
Auto-ignition temperature: 250 /C
Solubility in water: reaction
ENVIRONMENTAL DATA
NOTES
Environmental effects from the substance have not been investigated.
ADDITIONAL INFORMATION
Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible
LEGAL NOTICE for the use which might be made of this information
漏IPCS 2005
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