Flexible and toughened adhesive
EP21TDC-4 Master Bond

Master Bond Polymer System EP21TDC-4 is a two component, flexible epoxy resin system for high performance bonding, sealing and coating. It is formulated to cure at ambient temperatures or more quickly at elevated temperatures, with a one to four mix ratio by weight. The cured system has a peel strength greater than 30 pli and an elongation of over 200%. EP21TDC-4 bonds well to a wide variety of metals, plastics and especially rubbers. In fact, it may adhere well to untreated rubber materials such as neoprene, nitrile, SBR and occasionally EPDM rubber compounds; materials that normally require time consuming surface preparation. The cured system has excellent electrical insulation properties along with good chemical resistance to oils and water. The epoxy has superior resistance to rigorous thermal cycling along with an outstanding ability to resist mechanical shock and vibration. EP21TDC-4 has an exceptionally long open time greater than 90 minutes. It has an operating temperature range of -100°F to +250°F, with superb low temperature serviceability. It is widely used in OEM, electrical, electronic, repair and maintenance type applications. The EP21TDC-4 is also available in a non-drip version, called EP21TDC-4ND.