Low Viscosity, Optically Clear Epoxy Passes ISO 10993-5 Standard

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.

Low Viscosity, Optically Clear Epoxy Passes ISO 10993-5 Standard

Image Credit: Master Bond Inc.

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, anti-bacterial 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 pre-mixed and frozen syringes requiring storage at –40°C.

Master Bond Biocompatible Adhesives

Master Bond offers adhesives, sealants, coatings and potting/encapsulation compounds that pass one or both standard tests used to determine their suitability for medical device applications: U.S. Pharmacopeia (USP) Class VI for biocompatibility and/or ISO 10993-5 for non-cytotoxicity. These compounds include epoxies, silicones, UV/LED light, or dual curing systems and other chemistries. Read more about Master Bond’s biocompatible adhesive systems for medical devices at https://www.masterbond.com/properties/biocompatible-adhesives or contact technical support to discuss your application.

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