Efficiency of Urea- and Phenol-Formaldehyde in Particleboard

Urea-formaldehyde and phenol-formaldehyde resins were compared as binders in Douglas-fir particleboard. Urea-formaldehyde produced strength properties equal to those of boards made with equal amounts of phenol-formaldehyde under same conditions. Resin dilution studies suggest that phenol-formaldehyde has an advantage in that it is made and applied at 40 percent solids, while urea is generally applied at 60 percent solids. Urea-formaldehyde can lose efficiency as a result of the two distinct mechanisms: 1) resin formulations designed for short press cycles are subject to loss as a result of premature cure during pressing; 2) in long press cycles, there was an indication of physical loss of resin solids from the glue line.

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