Results
The amount of residual formaldehyde on 12 of the
16 types of plastic was less than that on the filter
paper, while it was higher on the other four types of
plastic (Table I). Compared with the filter paper,
the amount of residual formaldehyde on polyamide
6, polyurethane, natural rubber and polyacetal was
21.9, 15.2, 3.0 and 2.1 times greater than that on
the filter paper, respectively.