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Adhesives Handbook by J. Shields (Auth.)

By J. Shields (Auth.)

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OTHER CONSIDERATIONS Cost, shelf-life, toxicity, inflammability, odour, colour, corrosion properties, thermal, electrical, chemical, optical properties, etc. 12 Checklist of factors for adhesive selection SPECIFICATIONS Localised conditions often necessitate variations from 'standard' adhesive formulations to satisfy specific production problems. A checklist of the factors discussed above is presented here. Discussion of these factors with adhesives manufacturers will help to secure the most suitable adhesive for a given application at the lowest overall cost for material and processing.

Catalysts and hardeners These are curing agents for adhesive systems. Hardeners effect curing by chemically combining with the binder material and are based on a variety of materials (monomeric, polymeric, or mixed compounds). The ratio of hardener to binder determines the physical properties of the adhesive and can usually be varied within a small range. Thus, polyamides combine with epoxy resins to produce a cured adhesive. Catalysts, which themselves remain unchanged, are also employed as curing agents for thermosetting resins to reduce cure time and increase the crosslinking of the synthetic polymer.

Impact or shear) for many adhesives and is a factor to be considered. 6 Processing requirements The conditions under which the adhesive is to be bonded are also important criteria for the selection of the correct adhesive. Certain assembly circumstances can restrict the choice of an adhesive to a product that will bond under factory or assembly line production. Often, it may be that the working prop- A D H E S I V E SELECTION erties of the adhesive are the factors of overriding interest to the potential user.

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