Products, Materials + Tools | Sep 16, 2016

Optically Clear, Room Temperature Curing Epoxy Blocks UV Light Transmission

Formulated for specific optical applications, Master Bond EP30-2LB blocks UV light from 200-400 nm and allows the transmission of visible light from 450-900 nm. This two part system is optically clear with a refractive index of 1.55. It also passes ASTM E595 testing to meet NASA low outgassing specifications.

Beyond its optical properties, EP30-2LB is a reliable structural adhesive with a tensile lap shear strength of 3,000-3,200 psi and a compressive strength of 14,000-15,000 psi. It bonds well to a wide variety of substrates including metals, composites, glass, ceramics, rubbers and plastics. This epoxy has a ten to one mix ratio by weight and flows smoothly and evenly, enabling it to be used for coating, sealing and encapsulation applications. It is a capable electrical insulator, is dimensionally stable and has low shrinkage upon cure. This material also is easily machineable.

EP30-2LB resists chemicals including water, oils, fuels, acids and bases and many solvents. It is serviceable from -80°F to +300°F [-62°C to +149°C]. This compound has a shelf life of one year at room temperature in its original, unopened containers. It is available for use in ½ pint, pint, quart, gallon and 5 gallon container kits as well as gun dispensers.

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Master Bond NASA Low Outgassing Approved Epoxies:

Master Bond EP30-2LB offers a unique optical profile that blocks UV light and transmits visible/IR light. This system passes NASA low outgassing tests and offers a high temperature resistance. Read more about Master Bond’s adhesives that pass NASA low outgassing tests at or contact Tech Support. Phone: +1-201-343-8983 Fax: +1-201-343-2132 Email:

About Master Bond:

Master Bond Inc. is a custom formulator of advanced polymer systems. Master Bond Inc. was founded in 1976. Our focus has been on developing the best in epoxies, silicones, polyurethanes, polysulfides, UV cures and other specialty adhesive systems. We are true specialists in our field and are recognized by many as the preeminent adhesive formulation company in the world.
Through research and development, we have been able to create innovative, new compounds with truly unique properties. This effort has been led by our Technical Director, Dr. Walter Brenner. Dr. Brenner received his Ph.D. in Polymer Chemistry from Brooklyn Polytechnical Institute. He is a renowned Professor of Chemical Engineering and has served as a consultant for various U.S. Government agencies. He holds numerous patents and is credited with being the first person to develop electron beam radiation curing.