Optically Clear Epoxy Adhesive

Name: Optically Clear Epoxy Adhesive
Brand: Master Bond Inc.

Optically Clear Epoxy Adhesive - Master Bond

Developed for medical device applications, Master Bond EP21LSCL-2Med is a two component noncytotoxic 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.

EP21LSCL-2Med is an optically clear compound with a refractive index of 1.57. It has a high glass transition temperature of 110-120 °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 600-900 cps at room temperature. It is a moderate heat cured epoxy which features an exceptionally long gel time of 6-8 hours at room temperature for a 100-gram batch. EP21LSCL-2Med cures at room temperature followed by a post cure of 3-5 hours at 140-175 °F (60-80 °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 8,000-9,000 psi and a tensile modulus of 325,000-375,000 psi. This epoxy resists many sterilization methods such as steam sterilization, liquid sterilants, antibacterial agents, and Ethylene Oxide.

The shelf life of EP21LSCL-2Med is 6 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 premixed and frozen syringes requiring storage at -40 °C.

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