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