Effect of Specimen Stressing Upon Durability of Eight Wood Adhesives

Lap joints (1/2 inch by 1 inch) were prepared from 1/8 inch Douglas-fir veneer by gluing tight-to-tight with 1) hot press phenolic; 2) phenol-resorcinol; 3) cross-linking PVA; 4) MUF 60/40, brand X, 5) MUF C0/40, brand Y, 6) MUF 30/70; 7) melamine; and 8) urea. It was shown that stressing in most cases will accelerate glueline degradation. It is suggested that the percent wood failure ratio of stressed/ unstressed can be used to determine if the adhesive is more or less durable than the wood.

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