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| TRIMETHYL PHOSPHITE | ||
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PRODUCT IDENTIFICATION |
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| CAS NO. | 121-45-9 |
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| EINECS NO. | 204-471-5 | |
| FORMULA |
(CH3O)3P | |
| MOL WT. | 124.08 | |
| H.S. CODE | 2811.19 | |
| TOXICITY | ||
| SYNONYMS | Phosphorous acid, Trimethyl ester; Trimethoxyphosphine; | |
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Trimethylphosphit (German); Fosfito de trimetilo (Spanish); Phosphite de
triméthyle (French); |
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CLASSIFICATION |
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PHYSICAL AND CHEMICAL PROPERTIES |
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| PHYSICAL STATE | clear liquid | |
| MELTING POINT | -78 C | |
| BOILING POINT | 109 - 111 C | |
| SPECIFIC GRAVITY | 1.05 - 1.06 | |
| SOLUBILITY IN WATER | Decomposes | |
| pH | ||
| VAPOR DENSITY | ||
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AUTOIGNITION |
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NFPA RATINGS |
Health: 12; Flammability: 2 ; Reactivity: 0 | |
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REFRACTIVE INDEX |
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FLASH POINT |
52 C | |
| STABILITY | Stable under ordinary conditions. Moisture sensitive | |
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GENERAL DESCRIPTION AND APPLICATIONS |
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| Phosphorous acid is a clear to yellowish crystalline solid with a garlic like odour melting at 73 C, decomposes at 200 C. It is very soluble in water and in alcohol. This compound contains one direct P-H bond (which is not very acidic) and only two hydrogens bonded to oxygen (which are acidic). The structure of this material is more correctly written (HO)2HPO. For this reason, this dibasic acid forms two series of salts; the one contains the dihydrogen phosphite ion, H2PO3 - , and the other contains the hydrogen phosphite ion, HPO32-. This is an unstable compound that readily converts to phosphoric acid (H3PO4) in the presence of oxygen or on heating above 180 C. It is prepared by hydrolysis of phosphorus trichloride (or tetraphosphorus hexaoxide) with alcohols or phenols. Phosphorous acid esters are called phosphite with the formula (RO)3P. Phosphorous acid and phosphite are used as reducing agents in chemical industry because of easy oxidation property to phosphoric acid. They are used as antioxidant, stabilizer and chelating agent in plastic system. They are used as solvent in paint and as flame retardant on fibres. They are used as a chemical intermediate in the production of pharmaceutical ingredients, pesticides, optical brighteners and in lubricant additives and adhesives. | ||
| SALES SPECIFICATION | ||
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APPEARANCE |
clear liquid | |
| ASSAY |
98.0% min | |
| METHANOL | 1.0% max | |
| TRANSPORTATION | ||
| PACKING | 195ks in drum | |
| HAZARD CLASS | 3 (Packing Group: III) | |
| UN NO. | 2329 | |
| OTHER INFORMATION | ||
| Hazard Symbols: XN, Risk Phrases: 10-22, Safety Phrases: 9-16-28A-33-37-45 | ||
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