Master Bond EP21ND-LP two-part epoxy is for structural bonding applications involving large surface areas.

Has working life of 2-4 hr. at 75°F for a 100gm mass. Has smooth paste consistency. Shore D hardness is 70-80 when mixed in a one-to-one mix ratio by weight or volume. Certain properties can be altered by adjusting the mix ratio. Cures at room temperature or more rapidly at elevated temperatures. Reportedly achieves high strength, durable bonds and has excellent gap filling properties. Tensile strength ranges between 6,000 to 7,000psi. Has coefficient of thermal expansion of 50-55 x 10-6/in/in/°C. Volume resistivity is greater than 10¹⁴ohm-cm.

Master Bond
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