| Properties: | Clear, water-white, very sltly acid gas or liquid; pungent odor. Pure formaldehyde is not available commercially because of its tendency to polymerize. It is sold as aqueous solns containing from 37 to 50% formaldehyde by weight and varying amounts of methanol. Some alcoholic solns are used industrially, and the physical properties and hazards may be greatly influenced by the solvent. Lel: 7.0%, uel: 73.0%, autoign temp: 806°F, mp: −92°, d: 1.083, bp: −21°, flash p: (37%, methanol-free) 185°F, flash p: (15%, methanol-free) 122°F. Sol in H2O and most org solvs except pet ether. IDLH 20 ppm. |
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