SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 680319
CASRN 680-31-9
SynonymsHexamethylphosphoramide
Phosphoric triamide, hexamethyl-
HMPA
Analytical Method EPA Method 8141
Molecular FormulaC6H18N3OP

Link to the National Library of Medicine's Hazardous Substances
Database for more details on this compound.

Use PROCESSING SOLVENT FOR AROMATIC POLYAMIDE FIBER DE-ICING ADDITIVE FOR JET FUELS; EXPERIMENTAL CHEMOSTERILANT FOR A NUMBER OF INSECT PESTS; AS A CHEMICAL MUTAGEN AS A SOLVENT FOR POLYMERS, AS A SELECTIVE SOLVENT FOR GASES, AS A POLYMERIZATION CATALYST, AS A STABILIZER AGAINST THERMAL DEGRADATION IN POLYSTYRENE, AS AN ADDITIVE TO POLYVINYL & POLYOLEFIN RESINS TO PROTECT AGAINST DEGRADATION BY UV LIGHT, & AS A SOLVENT IN ORG & ORGANOMETALLIC REACTIONS IN RESEARCH LAB
Apparent Color COLORLESS, MOBILE LIQUID
Odor AROMATIC ODOR; SPICY ODOR
Boiling Point 233 DEG C @ 760 MM HG
Melting Point FP: 5-7 DEG C
Molecular Weight 179.24
Density 1.03 @ 20 DEG C
Environmental Impact Hexamethylphosphoramide may be released to the environment in waste streams generated at sites of its commercial production and use as a UV inhibitor in plastics, a specialty solvent, and as an experimental chemosterilant for insects. If released to soil or water, it may leach readily in soils and sediments. No data are available on biodegradation of hexamethylphosphoramide in soil or water. In water, hexamethylphosphoramide is not expected to bioconcentrate in aquatic organisms or volatilize from aquatic systems. If released to the atmosphere, hexamethylphosphoramide is expected to exist almost entirely in the vapor phase in the ambient atmosphere. It will degrade relatively rapidly by reaction with photochemically produced hydroxyl radicals (estimated half-life of 2 hr). Physical removal via wet deposition may occur. Occupational exposure and exposure of the general public to hexamethylphosphoramide occurs through dermal contact and inhalation of vapor.
Environmental Fate TERRESTRIAL FATE: Based on an estimated Koc of 34(1,2,SRC), hexamethylphosphoramide is expected to be very highly mobile in soil and may leach . Based upon an estimated Henry's Law constant of 2X10-8 atm cu-m/mole at 25 deg C(1,2,4,SRC), volatilization from moist soils is not expected to be an important fate process for hexamethylphosphoramide. AQUATIC FATE: Volatilization (based upon an estimated Henry's Law constant of 2X10-8 atm cu-m/mole at 25 deg C(1,2,4,SRC)), bioconcentration (based upon an estimated BCF of 0.96(1,2,SRC)), and adsorption to sediment (based upon an estimated Koc of 34(1,2,SRC)) are not expected to be important fate process of hexamethylphosphoramide in water. ATMOSPHERIC FATE: Based upon a measured vapor pressure of 0.046 mm Hg at 25 deg C , hexamethylphosphoramide is expected to exist almost entirely in the vapor-phase in the ambient atmosphere . It is expected to degrade relatively rapidly in an average ambient atmosphere (estimated half-life of about 2 hr) by reaction with photochemically produced hydroxyl radicals . Since hexamethylphosphoramide is miscible in water , physical removal via wet deposition is likely to occur.

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