Developed for medical device applications, Master Bond EP21LSCL-2Med is a two component non-cytotoxic epoxy for bonding, sealing, coating and potting. While most if not all epoxies will yellow over time, especially upon exposure to heat and intense UV light, EP21LSCL-2Med has been designed to resist yellowing to a greater extent than conventional systems. This unique feature makes it ideal for imaging applications or other medical devices where optical clarity is needed.

The epoxy was demonstrated to be compliant with ISO 10993-5, a standard that describes test methods to assess the in vitro cytotoxicity of medical devices. The optically clear compound features a refractive indexSource: Master Bond of 1.57, a high glass transition temperature of 110° C to 120° C and a service temperature range of -60° F to 350° F (-52° C to 177° C). This system has a 100:20 mix ratio by weight, and a low mixed viscosity of 600 to 900 cps at room temperature. It is a moderate heat cured epoxy which features an exceptionally long gel time of 6 to 8 hours at room temperature for a 100 gram batch. EP21LSCL-2Med cures at room temperature followed by a post cure of 3 to 5 hours at 140° F to 175° F (60° C to 80° C).

EP21LSCL-2Med adheres well to many substrates including but not limited to metals, composites, glass, ceramics and plastics. It offers a tensile strength of 8,000 to 9,000 psi and a tensile modulus of 325,000 to 375,000 psi. This epoxy resists many sterilization methods such as steam sterilization, liquid sterilants, anti-bacterial agents and ethylene oxide.

The shelf life of EP21LSCL-2Med is six months in its original, unopened containers, and it is available in kits ranging from ½ pints to 5 gallon pails, as well as specialty packaging in pre-mixed and frozen syringes requiring storage at -40° C.