Definitions

Cold-setting glues. Glues which set at normal room temperatures either by chilling or evaporation, etc.

Thermosetting glues. Glues which set with, and cannot be softened by, heat.

Assembly glues. Glues capable of supporting thick glue-lines without crazing—gap-filling glues.

Close-contact glues. Glues which will not tolerate thick glue-lines, but require intimate contact throughout.

Shelf life. Storage life in original containers. Pot life. Effective working life of mixed glue. Initial gel. First stage in curing of mixed glue. Gel has no strength.

Hardener. Accelerator or catalyst, usually an acid salt dispersed in water or spirit, or formic acid in solution. Function of the solvent is to ensure complete dispersal of acid throughout the glue, and can be coloured for identification. Crazing. Hair-cracks in solidified glue set up by excessive shrinkage, trapped solvent or inherent weakness in glue structure. Extenders. Filling material used to extend volume of glue, or to prevent excessive penetration.

Pressing or cramping time. Minimum time glued surfaces should remain under pressure. Basic setting time. Minimum hot-press time, to which must be added time allowances according to thickness of veneer, etc.

Note: All adhesives take several days to develop their maximum strength.

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