Master Bond EP40ND is a new two-component epoxy system designed for bonding, sealing, and coating applications. It’s a non-drip, toughened system with an easy-to-use 1:1 mix ratio by weight or volume.
EP40ND meets NASA’s low-outgassing specifications and has a high elongation of 80 to 90% at 75° F. It adheres well to several plastics, such as polycarbonates and acrylics, making it appropriate for applications that use substrates prone to stress cracking.
This flexible system provides a low-tensile modulus of 1,000 to 1,500 psi and a relatively high lap-shear strength of 1,600 to 1,800 psi. EP40ND has a Shore D Hardness measuring between 50 to 60 at 75° F. Serviceable from -100° to +250° F, this electrically insulative compound can withstand rigorous thermal cycling, vibration, impact, and shock.
EP40ND cures within two to three days at room temperature — or faster with the addition of heat. The viscosity of Part A is 50,000-100,000 cps, Part B is a thixotropic paste. It has a long working life after mixing.
In addition to plastics, this epoxy adheres well to a variety of dissimilar substrates such as metals, composites, glass, and ceramics. EP40ND can be used in aerospace, semiconductor, electronic, opto-electronic, and medical device industries. It’s available in standard packaging, as well as premixed and frozen syringes. It’s also available in double barrel cartridges for use with a gun dispenser.