Master Bond’s 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.
The epoxy possesses a thermal conductivity of 1.44 - 1.73 watts per m/k and a volume resistivity of 50 - 100ohm-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 to 90 minutes at 80°C. Post curing for 1 to 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 cps to 10,000 cps. It also provides a low coefficient of thermal expansion of around 15 to 20ppm/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 psi to 3,000 psi, a tensile modulus exceeding 750,000 psi and a Shore D hardness of 75 to 85 at 75°F (23.8°C). This system has a high glass transition temperature of 130°C to 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 sterilant. EP4G-80Med has a relatively long working life of 8 to 12 hours and must be refrigerated or frozen for storage. This black in colour product is packaged in 10cc and 30cc 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.
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