Medical grade epoxy offers thermal conductivity and electrical insulationEngineering360 News Desk | July 17, 2020
Master Bond EP42HT-4AOMed Black is a new two-part epoxy created for medical device manufacturing. It is biocompatible and non-cytotoxic, passing both USP Class VI and ISO 10993-5 certifications. This epoxy withstands aggressive chemical sterilants, radiation and repeated cycles of autoclaving.
EP42HT-4AOMed Black offers both cryogenic serviceability and heat resistance with a service temperature range from 4K to 400° F. Its thermal conductivity measures 9-10 BTU•in/(ft2•hr•°F) and its volume resistivity is greater than 1014 ohm-cm. The system contains a filler, which contributes to its high strength profile and dimensional stability. This adhesive bonds well to metals, composites, glass, ceramics, rubbers and plastics and features a tensile modulus of 500,000 to 550,000 psi, a compressive strength of 24,000 to 26,000 psi and a tensile strength of 7,000 to 8,000 psi.
This epoxy can cure at room temperature, yet faster cures can be achieved by heat curing. In order to obtain optimal properties, an overnight cure at room temperature, followed by heat curing at 150 to 200° F for two to three hours is recommended. The mix ratio is 100 to 40 by weight. Once mixed, this versatile adhesive has very good flow properties, making it suitable for bonding, sealing and coating applications. Upon curing, EP42HT-4AOMed Black exhibits very low shrinkage, low exotherm and can be used for castings up to 2 to 3 inches thick. This opaque black epoxy is available in the following size kits: ½ pint, pint, quart and gallon. It is also available in pre-mixed and frozen syringes, which are compatible with automated dispensing equipment.