It is well known that the formaldehyde SER from
plywood depends on humidity (Meyer, 1986; Van
Netten et al., 1989; Salthammer et al., 1995).
Urea treatment was particularly
effective with SERs of formaldehyde reduced to
0.30 mg m2 h1 at 30 1C and 0.65 mg m2 h1 at
60 1C. In percentage terms to untreated plywood,
the formaldehyde SERs with urea treatment were
reduced to 6.8% and 4.3% for 30 1C and 60 1C,
respectively.
3