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Hot melt adhesives are those adhesives that do not contain solvents. They bond by being applied as a hot liquid and solidifying as they cool. Hot melts can produce a rapid bond because they bond as soon a the heat is removed. Hot melts normally are handled in the temperature range from 149 to 260°C / 300 to 5000F. See discussion on similar materials under Adhesive.
Pump Notes: Pump construction varies from cast iron to stainless steel depending on the corrosive nature of individual adhesives. Elastomers also vary depending on individual adhesives and pumping temperature. Shaft sealing may be packing or special lip seals. Generally, adhesives are very viscous and the pump design must be capable of handling those viscosities. Adhesives may also contain abrasives and the pump design must be capable of handling particulate.