Formaldehyde vapor evolution

Adequate ventilation is necessary for aH process lines to ensure worker safety. Electroless copper baths must have good ventilation to remove toxic formaldehyde vapors and caustic mist generated by the hydrogen evolution reactions and air sparging. Electroless nickels need adequate ventilation to remove nickel and ammonia vapors. Some states and municipalities requite the removal of ammonia from wastewaters. A discussion of printed circuit board environmental issues and some sludge reduction techniques is avaHable (25). 

Paraformaldehyde. (CH20)g, mw (30.03)n white, cryst powder mp 64, bp sublimes, range of polymerization n=8 to 100. Note Paraformaldehyde is not the same as sym-tri-oxane, which melts at 150—60°. Slowly sol in cold, more readily in hot w, with evolution of formaldehyde insol in ale eth sol in fixed alkali hydroxide solns. Obtained by concentrating formaldehyde soln. At ordinary temps, it gradually vaporizes, yielding formaldehyde gas... 

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