Rubber-based solvent cements are adhesives made by combining one or more rubbers or elastomers in a solvent. These solutions are further modified with additives to improve the tack or stickiness, the degree of peel strength, flexibility, the viscosity or body. It is adhesive on pressure-sensitive tapes used as floor tile adhesive and carpeting adhesive. Self sealing envelopes and shipping containers use rubber cements. Solvent based rubber adhesives have been the mainstay of the shoe and leather industry.
Epoxies are adhesive systems made by a complex chemical reaction.
Various resins are made synthetically by reacting two or more chemicals. The resultant resin can then be reacted or cured by the addition of another chemical called a hardener, or catalyst. The basic epoxy resin systems are further modified to change their physical properties by the addition of such things as flexibilizers for impact resistance and flexibility, diluents or solvents to reduce the viscosity fillers and reinforcements like glass fiber, alumina, silica sand, clay, metal powders and flakes to change properties such as heat and electrical resistance, fire retardance, strength and adhesion to certain substrates or materials. Epoxy adhesives can bond a wide variety of substrates with high strength particularly metals. They have been used to replace some traditional metalworking methods of joining like nuts and bolts, rivets, welding, crimping, brazing and soldering.