Sept. 29, 2021
One component, nanosilica filled LED curable system

Key Features

  • Meets ISO 10993-5 for cytotoxicity
  • Fast cure with appropriate LED light
  • Resists sterilization
  • Not oxygen inhibited
  • Can cure up to 1/8 inch thick
  • Outstanding optical clarity

Master Bond EP39-2 is a fast curing, low viscosity, optically clear, two component epoxy system for high performance bonding, sealing, coating and casting. The mix ratio is a forgiving two to one by weight. Upon mixing, this very low viscosity system is relatively faster curing. As a coating, in sections as thin as 0.005-0.01 inches, it will become tack-free at ambient temperatures in 3-4 hours and will fully cure in a day or so. The optimum cure schedule is 3-4 hours at ambient temperatures followed by 2-3 hours at 140-170°F. An interesting property of EP39-2 is its ability to polymerize at lower temperatures, down to 40°F. Also, EP39-2 has very low shrinkage upon curing.

It is an excellent adhesive and bonds well to a wide variety of substrates including metals, composites, ceramics and glass as well as many rubber and plastic materials. Other desirable characteristics include resistance to blushing and exudation, reliable electrical insulation properties and good rigidity along with outstanding chemical resistance (see chart below). EP39-2 also can be used for smaller potting and encapsulation applications. The service temperature range is -60°F to +300°F. Also significant is its optical clarity and very good light transmission properties. This versatile system can be used in aerospace, electronic, optical, electro-optic and specialty OEM applications where the product properties mentioned above are beneficial.

Product Advantages

  • Convenient handling with a forgiving two to one mix ratio by weight
  • Easy application by roller, brush or spraying
  • Faster curing, shorter tack-free times and well suited for coating applications
  • Resistance to blushing and exudation
  • Good optical clarity and excellent light transmission
  • Cures rigid, well suited for machining or polishing
  • Outstanding chemical resistance

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