Solvent based contact adhesives are expensive and are hazardous to both humans and the environment.
Water based adhesives are cost effective and are NOT hazardous to humans or the environment.
Historically contact adhesives were based on volatile organic solvents. Polymers such as polychloroprene or natural rubber are dissolved in a solvent e.g. toluene, xylene or dichloromethane. The resulting adhesive exhibits very high levels of tack. When a solvent based adhesive is applied to a substrate and the two surfaces are brought together an instant bond is formed. Solvent based sprayable solvents have been used for many years in the furniture industry. They have been used in the production of sofas, chairs, beds and other items of furniture. The adhesive is used to bond foam to foam, foam to fibre and foam and fibre to wood. The adhesive is sprayed on to both components which are brought together forming an instant bond. Solvent will remain in the adhesive bond but as it is volatile it will evaporate very quickly.