Dimethylphosphite
Dimethyl hydrogen phosphonate
Phosphorous acid dimethyl ester
Dimethylphosphonate
C2H7O3P
Molecular mass: 110.1
ICSC # 1599
CAS # 868-85-9
RTECS # SZ7710000
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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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Combustible.
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NO open flames, NO sparks, and NO smoking.
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Foam.
Alcohol-resistant foam.
Carbon dioxide.
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Explosion
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Above 70°C explosive vapour/air mixtures may be formed.
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Above 70°C use a closed system, ventilation.
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In case of fire: cool drums, etc., by spraying with water but avoid contact of the substance with water.
Combat fire from a sheltered position.
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Exposure
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•Inhalation
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Cough.
Nausea.
Sore throat.
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Ventilation, local exhaust, or breathing protection.
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Fresh air, rest.
Refer for medical attention.
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•Skin
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MAY BE ABSORBED!
Redness.
Pain.
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Protective clothing.
Protective gloves.
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First rinse with plenty of water, then remove contaminated clothes and rinse again.
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•Eyes
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Redness.
Pain.
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Safety goggles
.
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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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Diarrhoea.
Nausea.
Vomiting.
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Do not eat, drink, or smoke during work.
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Rinse mouth.
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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Personal protection:
filter respirator for acid gases.
Chemical protection suit.
Do NOT let this chemical enter the environment.
Cover the spilled material with absorbent.
Collect leaking liquid in sealable containers.
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Dry.
Store in an area without drain or sewer access.
Separated from
food and feedstuffs
.
See Chemical Dangers.
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Important Data
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Physical State; Appearance:
COLOURLESS LIQUID
Physical Dangers:
The vapour is heavier than air.
Chemical Dangers:
The substance decomposes
rapidly
on heating
producing
toxic fumes
including
phosphorus oxides
and
phosphine
;
on contact with
moist air
above 220°C
producing phosphoric acid and methanol
.
The solution in water is a strong acid, it reacts violently with bases and is corrosive.
Reacts
violently with
acids
and
oxidants
.
Occupational Exposure Limits:
TLV not established.
MAK:
Carcinogen category: 3B;
(DFG 2005).
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Routes of Exposure:
The substance can be absorbed into the body
by inhalation,
through the skin
and
by ingestion.
Inhalation Risk:
A harmful contamination of the air will be reached slowly on evaporation of this substance at 20°C; on spraying or dispersing, however, much faster.
Effects of Short-Term Exposure:
The substance
is irritating to
the eyes
and
the skin
.
Effects of Long-Term or Repeated Exposure:
The substance may have effects on the eyes
, resulting in cataract.
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Physical
Properties
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Boiling point: 171°C
Melting point: < -60°C
Relative density (water = 1): 1.2
Solubility in water, g/100 ml at 20°C: >10
Vapour pressure, kPa at 20°C: 0.135
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Flash point: 70°C c.c.
Auto-ignition temperature: 237°C
Explosive limits, vol% in air: 5.8-38.1
Octanol/water partition coefficient as log Pow: -1.2
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Environmental
Data
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The substance is harmful to aquatic organisms.
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N O T E S
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Do NOT use in the vicinity of a fire or a hot surface, or during welding.
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ADDITIONAL INFORMATION
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ICSC: 1599
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DIMETHYL HYDROGEN 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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