Polysulfide adhesive EP21TPHT
for metalfor plasticsglass

polysulfide adhesive
polysulfide adhesive
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Chemical composition
Type of substrate
for metal, for plastics, glass, for rubber, for ceramics
Number of components
Technical characteristics
electrically insulating, chemical-resistant
for electronics, sealing, for coating, for OEM, for the aerospace industry, for bonding


Key Features * Convenient handling * Tough, flexible bonds * Superior electrical insulation properties * Chemical resistance to fuels, oils, hydrocarbons and hydraulic fluids Master Bond EP21TPHT is a two component epoxy polysulfide system featuring easy processing. It has a one to one mix ratio by weight or volume. Mixing is straightforward as both Parts A and B are liquids. EP21TPHT cures readily at ambient temperatures in 48 to 72 hours. The optimum cure is overnight at room temperature followed by 2-3 hours at 150°F. The system has low shrinkage upon curing. EP21TPHT bonds well to a variety of substrates, including metals, glass, ceramics and many rubbers and plastics. It is a toughened system with good elongation and flexibility. EP21TPHT can withstand rigorous thermal cycling as well as mechanical and thermal shock. The forte of the cured system is chemical resistance to water, gasoline, fuels, oils, hydrocarbons, hydraulic fluids, and lubricants. This material is an outstanding electrical insulator. Also significant is that it has enhanced temperature resistance when compared to other epoxy polysulfide systems. The service temperature range is -80°F to +350°F. Part A is clear and Part B is slightly amber, although other colors are available upon request. Polysulfide epoxies are a special group of adhesives and sealants since they combine good toughness along with chemical resistance. EP21TPHT should be considered in aerospace, electronic, electrical, specialty OEM, and other applications where the combination of chemical resistance, along with a measure of resiliency are desirable.


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