Polyvinyl-Resin Emulsion Woodworking Glues

Evaluation was made of several polyvinyl resin emulsion glues and results were compared to results of tests on 11 similar glues evaluated in an earlier project reported in 1947. Limitations of earlier glues were restudied to determine their importance in selection of glues for various woodworking operations. The greatest change in polyvinyl-resin emulsion glues appeared to be greater uniformity in joint performance. In general, the thermoplasticity of polyvinyl resins as a group does not appear to be a serious limitation for many interior applications. The selection of such emulsion glues, however, for highly stressed joints in construction where high temperatures are likely to be encountered over a period of time should be carefully considered. One example would be their use in small radio and television cabinets that are not adequately ventilated. Polyvinyl-resin emulsion glues lose a considerable proportion of their initial strength in plywood and edge-glued joints when stressed during and after exposure at high relative humidities, where the wood approaches 20 to 26 percent moisture content. The critical use limitation of these glues for relative mild service conditions is their tendency to creep or cold flow.

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