Handbook of Adhesives and Sealants

676 Chapter SixteenTABLE 16.23 Characteristics of Common Wood Adhesives 73Resin typeusedResinsolids ingluemix, %PrincipaluseMethod ofapplicationPrincipalpropertyPrincipallimitation23–30 Wood towood interiorSpreaderrollsUrea formaldehydeBleedthroughfree;good adhesionPoordurability23–27 PlywoodexteriorSpreaderrollsDurabilityPhenol formaldehydeComparativelylong curetimesMelamine formaldehyde68–72 Wood towood, splicing,patching,scarfingSprayed,combedAdhesion,color,durabilityRelativecost;poorwashability;needsheat tocureMelamine urea2/155–60 End and edgegluingexteriorApplicatorColorless,durabilityand speedCostResorcinolformaldehyde50–56 Wood towoodexterior(laminating)SpreaderrollsCold set durabilityCost,odorPhenolresorcinol10/9050–56 Wood to woodexterior (laminating)SpreaderrollsWarm-set durabilityCost,odorPolyvinyl-acetateemulsion45–55 Wood to woodinteriorBrushed,sprayed,spreaderrollsHandyLack ofH 2 Oandheat resistanceadhesives are known as white glues. They set by the evaporation ofmoisture from the adhesive. Polyvinyl acetate adhesives produce verystrong bonds, but are not resistant to moisture or high temperatures.This drying process is often accelerated in the furniture industry bythe application of radio frequency electric fields. Where resistance tomoisture is required, there are crosslinking polyvinyl acetate adhesives.They cure through chemical reaction as well as evaporation.Unlike the more conventional white glues, crosslinked polyvinyl acetateglues cannot be cleaned with water after it cures.Aliphatic resin glues, also known as yellow glue or carpenter’s glue,are similar to polyvinyl acetate adhesives. They are specifically formulatedto use for interior woodworking applications and should not