DIMETHYL HYDROGEN PHOSPHITE 1599
October 2005
CAS No: 868-85-9 Dimethylphosphite
Dimethyl hydrogen phosphonate
RTECS No: SZ7710000
Phosphorous acid dimethyl ester
Dimethylphosphonate
C2H7O3P
Molecular mass: 110.1
TYPES OF
ACUTE HAZARDS/SYMPTOMS PREVENTION FIRST AID/FIRE FIGHTING
HAZARD/
EXPOSURE
FIRE Combustible. NO open flames, NO sparks, and NO Foam. Alcohol-resistant foam.
smoking. Carbon dioxide.
EXPLOSION Above 70/C explosive vapour/air Above 70/C use a closed system, In case of fire: cool drums, etc., by
mixtures may be formed. ventilation. spraying with water but avoid contact
of the substance with water. Combat
fire from a sheltered position.
EXPOSURE
Inhalation Cough. Nausea. Sore throat. Ventilation, local exhaust, or breathing Fresh air, rest. Refer for medical
protection. attention.
Skin MAY BE ABSORBED! Redness. Protective clothing. Protective gloves. First rinse with plenty of water, then
Pain. remove contaminated clothes and
rinse again.
Eyes Redness. Pain. Safety goggles. First rinse with plenty of water for
several minutes (remove contact
lenses if easily possible), then take to
a doctor.
Ingestion Diarrhoea. Nausea. Vomiting. Do not eat, drink, or smoke during Rinse mouth. Do NOT induce
work. vomiting. Refer for medical attention.
SPILLAGE DISPOSAL PACKAGING & LABELLING
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.
EMERGENCY RESPONSE SAFE STORAGE
Dry. Store in an area without drain or sewer access. Separated from food and
feedstuffs. See Chemical Dangers.
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
1599 DIMETHYL HYDROGEN PHOSPHITE
IMPORTANT DATA
Physical State; Appearance Routes of exposure
COLOURLESS LIQUID The substance can be absorbed into the body by inhalation,
through the skin and by ingestion.
Physical dangers
Inhalation risk
The vapour is heavier than air.
A harmful contamination of the air will be reached slowly on
Chemical dangers evaporation of this substance at 20/C; on spraying or dispersing,
however, much faster.
The substance decomposes rapidly on heating producing toxic
fumes including phosphorus oxides and phosphine; on contact
Effects of short-term exposure
with moist air above 220/C producing phosphoric acid and
methanol. The solution in water is a strong acid, it reacts violently The substance is irritating to the eyes and the skin.
with bases and is corrosive. Reacts violently with acids and
oxidants. Effects of long-term or repeated exposure
The substance may have effects on the eyes, resulting in
Occupational exposure limits cataract.
TLV not established.
MAK: Carcinogen category: 3B; (DFG 2005).
PHYSICAL PROPERTIES
Boiling point: 171/C Flash point: 70/C c.c.
Melting point: < -60/C Auto-ignition temperature: 237/C
Relative density (water = 1): 1.2 Explosive limits, vol% in air: 5.8-38.1
Solubility in water, g/100 ml at 20/C: >10 Octanol/water partition coefficient as log Pow: -1.2
Vapour pressure, kPa at 20/C: 0.135
ENVIRONMENTAL DATA
The substance is harmful to aquatic organisms.
NOTES
Do NOT use in the vicinity of a fire or a hot surface, or during welding.
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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