10 November 2021
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Non-cytotoxic epoxy for medical applications

Master Bond EP62-1HTMed is a two-part epoxy that meets the requirements of ISO 10993-5 for non-cytotoxicity (toxicity to living cells) and therefore can be utilized in many medical device applications. It features high temperature resistance, good flow properties and is suitable for bonding, sealing and coating, according to the company.

The company says that the product resists repeated sterilisation cycles, including STERRAD and autoclaving. It is also capable of withstanding exposure to gamma radiation, ethylene oxide, bleach as well as other aggressive sterilants and chemicals.

EP62-1HTMed offers a tensile strength of 10,000-11,000 psi and adheres well to a variety of similar and dissimilar substrates, including metals, plastics, rubbers, ceramics and composites. This electrically insulative compound has a volume resistivity of more than 1014 ohm-cm, a glass transition temperature of 150-155°C and is serviceable from -51°C to +232°C.

EP62-1HTMed has a working life of 12-24 hours for a 100-gram mass and requires moderate heat for curing. Cure schedule options are 60-70 minutes at 80-100°C or 20-30 minutes at 125°C. Post curing at 100-150°C for three to five hours is recommended to achieve optimal performance properties.

The epoxy contains no solvents or diluents and has low shrinkage upon cure with a hardness of 80-90 Shore D. This system has a mix ratio by weight of 100 to 5 and can be supplied in standard-sized units at the pint and quart scale and can also be packaged in premixed and frozen syringes to avoid the need for mixing and to allow for compatibility with automated dispensing systems.

Author
FAST magazine

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