Master Bond‘s EP4G-80Med is a one-part epoxy that’s designed for use in the assembly of medical devices. It complies with the ISO 10993-5 guidelines and is considered to be non-cytotoxic.

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 to 100 ohm-cm.

EP4G-80Med bonds well to a variety of substrates including metals, glass, ceramics, rubbers, and many plastics.

It’s extremely 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, rather it cures readily in 60-90 minutes at 80° C.

Post-curing for one to two hours at 80° C is also recommended as it will optimize the overall properties of the epoxy. Its curing profile makes this epoxy 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 to 10,000 cps,” explains Rohit Ramnath, senior product engineer. “It also provides a low coefficient of thermal expansion of around 15-20 ppm/C at room temperature.”

EP4G-80Med is a dimensionally stable epoxy that further offers:

• A tensile strength of 2,000 to 3,000 psi
• A tensile modulus exceeding 750,000 psi
• A Shore D hardness of 75 to 85 at 75° F.
• A high-glass transition temperature of 130-140°C, which is serviceable over the temperature range of -50° to +175° C.
• The ability to withstand exposure to water, antimicrobial agents, and several chemical sterilants.

In addition, EP4G-80Med has a relatively long working life of 8 to 12 hours and must be refrigerated or frozen for storage. This black in color product is packaged in 10 and 30 cc syringes, which are shipped in dry ice. After thawing it is easy to apply.