ester). The elastomers can be based on acrylics, which can have sufficient tack on their own and do not require a tackifier. Styrene block copolymers (SBC), also called styrene copolymer adhesives and rubber-based adhesives, have good low-temperature flexibility, high elongation, and high heat resistance. They are frequently used in hot melt adhesive applications, where the composition retains tack even when solidified; however non-pressure-sensitive formulations are also used. They usually have A-B-A structure, with an elastic rubber segment between two rigid plastic endblocks. High-strength film formers as standalone, increase cohesion and viscosity as an additive. Water-resistant, soluble in some organic solvents; cross-linking improves solvent resistance. Resins associating with endblocks (cumarone-indene, α-methyl styrene, vinyl toluene, aromatic hydrocarbons, etc.) improve adhesion and alter viscosity. Resins associating to the midblocks (aliphatic olefins, rosin esters, polyterpenes, terpene phenolics) improve adhesion, processing and pressure-sensitive properties. Addition of plasticizers reduces cost, improves pressure-sensitive tack, decrease melt viscosity, decrease hardness, and improves low-temperature flexibility. The A-B-A structure promotes a phase separation of the polymer, binding together the endblocks, with the central elastic parts acting as cross-links; SBCs do not require additional cross-linking. Styrene-butadiene-styrene (SBS) is used in high-strength PSA applications, styrene-ethylene/butylene-styrene (SEBS) in low self-adhering non-woven applications, and styrene-ethylene/propylene (SEP) and styrene-isoprene-styrene (SIS) are used in low-viscosity high-tack PSA applications. See also Blu-Tack Contact mechanics Dynamic mechanical analysis Glue dots Gaffer tape List of adhesive tapes Post-it note Rheology Self-adhesive stamp Viscoelasticity Pressure-sensitive paper References Further reading "Pressure-Sensitive Adhesives and Applications", Istvan Benedek, 2004, "Pressure Sensitive Adhesive Tapes", J. Johnston, PSTC, 2003, "Pressure Sensitive Formulation", I. Benedek, VSP, 2000, Adhesives Stationery