Strength properties, color product testing

Inspection tests before shipments of adhesive products are as follows adhesion strength, tackiness, hardness, viscosity, density, volume shrinkage, thermal expansion, shelf life, pot life, gelation time, water resistance, chemical resistance, weather resistance, flame retardance, electric conductivity, color, optical properties, amount of volatile organic compounds (VOC) emergence, etc. Some of these tests are the same as those tests for acceptance. Before shipment, strength tests of joints are very important for adhesives in terms of performance proof (see Chap. 19). In contrast, for PSAs, tackiness is important (see Chap. 15). Other important properties that should he tested are shown below. 

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