Plastisols are liquid dispersions of a finely divided thermoplastic resin, generally polyvinyl chloride, in a plasticizer. These resulting pastes are highly viscous mixtures that on heating become homogenized so that a single solid phase results. When cooled the plastisol provides a tough material with good physical characteristics. Over the years these inexpensive materials have become popular as both adhesives and sealants.
The primary reasons for the commercial success of plastisols are their low cost and ease of application. Plastisols require temperatures on the order of 130°C to 400°C to "cure"; however, they are commercially supplied as one component pastes without the need for metering or mixing prior to application. Moderately high bond strength can be achieved to many common substrates. Long-term flexibility is a distinct advantage in that the plastisol can accommodate relative motion between substrates and act as a vibration damper. This feature enables PVC plastisols to compete in both the adhesive and sealant markets.