Thermally conductive epoxy for large potting applications offers low exotherm

21-08-2020 | Masterbond | Subs & Systems

Master Bond EP29LPAOHT is a two-component, NASA low outgassing approved epoxy system offering a long working life of 8-10 hours per 1,000g batch. Due to its low exotherm and flowable consistency, this product is ideal for speciality potting applications where large masses of the epoxy require to be cured. The epoxy can be mixed and poured in volumes of more than a gallon at a time. Even in deep cross-section thicknesses, this product does not produce much heat. Since the epoxy does not start gelling immediately, it is particularly advantageous for application in many production environments that need a long open time after mixing.

The epoxy has a 50 to 100 mix ratio by weight and a mixed viscosity of 10,000-30,000cps. It holds a high thermal conductivity value of 0.87-1.15W/(m•K) and is electrically insulative with a volume resistivity of more than 1015Ohm-cm. Upon curing the epoxy displays low shrinkage, dimensional stability and a low coefficient of thermal expansion. Other outstanding properties include a compressive strength of 24,000-26,000psi, a Shore D hardness of 80-90 and a tensile modulus of 450,000-500,000psi. This epoxy is serviceable over the broad temperature range of -60F to +350F.

The product bonds well to a mixture of substrates incorporating glass, metals, ceramics and many different plastics. The epoxy resists many chemicals including, but not limited to, water, fuels and oils. It is available for use in half-pint, pint, quart and gallon container kits. The epoxy does not contain solvents and is RoHS compliant.

By Natasha Shek