Effects of Separate Additions to Furnish Or Veneer on Formaldehyde Emission and Other Properties: A Literature Review (1960-1984)

Separate additions of furnish or veneer refers to treatment of those substrates with formaldehyde reactive materials (scavengers) before or after coating with the adhesive in order to reduce formaldehyde emissions from particleboard or plywood. I have examined the literature on this subject through 1984 and have divided the various reported treatments into four approaches: 1) adding small amounts of scavenger-impregnated lignocellulosics to furnish, 2) spraying furnish or veneer with simple formaldehyde reactive chemicals, 3) spraying furnish with an aqueous wax or polymer dispersion that contains urea, 4) using middle-layer furnish that contains urea and is bonded with non-urea-formaldehyde adhesive. Increasing sophistication of approach (3) reportedly has led to European processes that produce particleboards able to meet both physical property requirements and the strictest German formaldehyde emission standard (E-1).

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