Phophorous acid, trimethyl ester
Trimethoxy phosphine
Methyl phosphite
C3H9O3P / (CH3O)3P
Molecular mass: 124.1
ICSC # 1556
CAS # 121-45-9
RTECS # TH1400000
UN # 2329
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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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Flammable.
Gives off irritating or toxic fumes (or gases) in a fire.
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NO open flames, NO sparks, and NO smoking.
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Foam,
carbon dioxide,
powder
.
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Explosion
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Above 23°C explosive vapour/air mixtures may be formed.
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Above 23°C use a closed system, ventilation, and explosion-proof electrical equipment.
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In case of fire: cool drums, etc., by spraying with water but avoid contact of the substance with water.
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Exposure
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AVOID Exposure OF (PREGNANT) WOMEN!
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•Inhalation
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Cough.
Sore throat.
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Ventilation, local exhaust, or breathing protection.
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Fresh air, rest.
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•Skin
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Redness.
Pain.
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Protective gloves.
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Rinse and then wash skin with water and soap.
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•Eyes
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Redness.
Pain.
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Safety spectacles.
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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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Do not eat, drink, or smoke during work.
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Rinse mouth.
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Spillage Disposal
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Storage
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Packaging & Labelling
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Collect leaking and spilled liquid in sealable containers as far as possible.
Personal protection: self-contained breathing apparatus.
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Fireproof.
Separated from
oxidants
,
strong bases.
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UN Hazard Class: 3
UN Packing Group: III
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Important Data
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Physical State; Appearance:
COLOURLESS LIQUID
, WITH PUNGENT ODOUR.
Physical Dangers:
Chemical Dangers:
On combustion, forms toxic fumesincludingphosphineandphosphorous oxides.
Reacts
with
water
producing
methanol
and
dimethyl phosphite.
Reacts
with
oxidants
and
strong bases
.
Reacts
with
magnesium perchlorate
causing explosion hazard.
Occupational Exposure Limits:
TLV: 2 ppm as TWA; (ACGIH 2004).
MAK: IIb (not established but data is available); skin absorption (H); (DFG 2004).
OSHA PEL: none
NIOSH REL: TWA 2 ppm (10 mg/m3)
NIOSH IDLH: N.D. See: IDLH INDEX
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Routes of Exposure:
The substance can be absorbed into the body
through the skin
and
by ingestion.
Inhalation Risk:
A harmful contamination of the air can be reached very quickly on evaporation of this substance at 20°C.
Effects of Short-Term Exposure:
The substance
is severely irritating to
the eyes
and
the skin
.
The vapour
is irritating to
the respiratory tract
.
Effects of Long-Term or Repeated Exposure:
Animal tests show that this substance possibly causes toxicity to human reproduction or development.
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Physical
Properties
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Boiling point: 111.5°C
Melting point: -78°C
Relative density (water = 1): 1.1
Solubility in water:
reaction
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Vapour pressure, kPa at 25°C: 3.2
Relative vapour density (air = 1): 4.3
Flash point:
23°C c.c.
Auto-ignition temperature: 250 °C
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Environmental
Data
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N O T E S
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Environmental effects from the substance have not been investigated.
Transport Emergency Card: TEC (R)-30GF1-III
NFPA Code: H1; F3; R1;
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ADDITIONAL INFORMATION
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ICSC: 1556
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TRIMETHYL PHOSPHITE
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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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