Casein Glues

Casein glues exhibit good resistance to heat and can satisfactorily bond wood at low moisture contents. They are capable of setting at low temperatures and can bond woods that tend to produce oily surface films such as teak, pitch pine, ponderosa pine, and yews. They tend to stain wood, however, and are subject to deterioration when exposed to mold and fungus growths. According to the percentage of lime and the incorporation of minor quantities of special ingredients, casein glues are divided into four classes. Class I are those used in aircraft repair, rafter laminating, and government specification work. Class II are commonly used in sash and door work and in plywood. Class III are used in furniture plywood. Class IV are suitable for assembly gluing, solid furniture, and cabinet work. Faulty glue lines are generally due to improper application of glue mix, improper spread, assembly time, pressure, and pressure period, and improper conditioning of the wood or veneer surfaces to be glued. Assembly times may be shortened by using thin mixes and light spreads. Pressure period may be shortened by using a quick-setting grade, heavy glue mix, incorporation of alcohol, maximum assembly, time, heated wood, and application of heat during curing. From 3 to 5 percent of pentachlorophenol can be added at the time of mixing as a mold inhibitor.

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