Enhanced adhesion of melamine-urea and melamine adhesives to CCA-treated southern pine lumber

Thermosetting wood adhesives do not adhere well enough to wood treated with chromated copper arsenate (CCA) preservatives to consistently meet rigorous standards for resistance to delamination in structural laminated timbers. Melamine-urea-formaldehyde (MUF) and melamine-formaldehyde (MF) are two such adhesives. Furthermore, MUF combinations are not acceptable for bonding to CCA-treated wood under the commercial standard ANSI/AITC A 190.1-1992. However, this study demonstrated that a hydroymethylated resorcinol (HMR) coupling agent greatly enhances the durability of adhesion, particularly resistance to delamination, of both types of adhesives in radio-frequency-cured lumber laminates of CCA-treated southern pine. Although neither adhesive quite met delamination requirements in these tests, It appears that properly formulated MUF and MF adhesives could meet requirements of the qualifying standard ASTM D 2559 on HMR-primed CCA-treated wood.

You must be logged in to download any documents. Please login (login accounts are free) or learn how to Become a Member