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  1. Master Bond
4 September 2022

Low Viscosity, Electrically Conductive Epoxy Meets ISO 10993-5 Cytotoxicity Standards

Master Bond EP4G-80Med is a one-part epoxy designed for use in the assembly of medical devices. This system is formulated with a non-metallic, graphite filler, which leads to good thermal and electrical conductivity. It possesses a thermal conductivity of 1.44-1.73 W/(m•K) and a volume resistivity of 50-100 ohm-cm. Furthermore, it complies with the ISO 10993-5 guidelines and is considered to be non-cytotoxic.

EP4G-80Med bonds well to a variety of substrates including metals, glass, ceramics, rubbers and many plastics. It is very effective as an EMI/RFI shielding compound and can also be used for static dissipation purposes. This system does not need high heat to cure; it cures readily in 60-90 minutes at 80°C. Post-curing for 1-2 hours at 80°C is commonly recommended as it will optimise the overall properties of the epoxy. Its curing profile makes it suitable for many applications involving heat-sensitive substrates.

“The product’s unique feature is that despite incorporating a graphite-based filler material it actually exhibits an excellent flow profile, especially for an electrically conductive system, with a viscosity of 4,000-10,000cps. It also provides a low coefficient of thermal expansion of around 15-20 ppm/C at room temperature”, says Rohit Ramnath, Senior Product Engineer.

EP4G-80Med is a dimensionally stable epoxy that offers a tensile strength of 2,000-3,000psi, a tensile modulus exceeding 750,000 psi and a Shore D hardness of 75-85 at 75°F. This system has a high glass transition temperature of 130-140°C and is serviceable over the temperature range of -50°C to +175°C. It can withstand exposure to water, antimicrobial agents and many chemical sterilants.

EP4G-80Med has a relatively long working life of 8-12 hours and must be refrigerated or frozen for storage. This black-in-colour product is packaged in 10cc and 30 cc syringes, which are shipped in dry ice. After thawing, it is easy to apply. EP4G-80Med does not contain any solvents and is RoHS-compliant.

For more information, please contact Master Bond via the contact details on our profile.

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