Two component, room temperature curing epoxy compound

Key Features

  • Heat, chemical and steam resistance
  • Cures at ambient or elevated temperatures
  • Can be used for bonding, sealing, coating, casting & potting applications
  • Serviceable from -60°F to +450°F

Product Description

Master Bond EP42HT-2 is a room temperature curable, two component epoxy adhesive, sealant, coating and casting material featuring high temperature resistance along with outstanding chemical resistance. While EP42HT-2 is a superior adhesive, sealant and coating, it is also relatively low in exotherm and castable up to 2-3 inches thick. EP42HT-2 cures readily at ambient temperatures in 2-3 days, or in 2-3 hours at 200°F. The optimum cure is either of these schedules followed by an additional post cure for 3-5 hours at 225-300°F. EP42HT-2 has an easy to use 100 to 40 mix ratio by weight or 100 to 50 by volume. It is resistant to a wide variety of acids, bases, solvents, fuels, oils and salts. It also has excellent electrical insulation properties. Its service temperature range is from -60°F to +450°F. EP42HT-2 is used in electronic, electrical, fiber-optic, optical and OEM type applications. The regular color of Part A is clear and Part B is amber. It is also available in black and other colors, upon request. The system has superior optical transmission properties, particularly in thinner sections, as well as a high index of refraction for an epoxy.

Product Advantages

  • Non-critical 100 to 40 mix ratio by weight or 100 to 50 by volume
  • Easy application: only contact pressure required while curing; adhesive spreads readily
  • Excellent chemical resistance to acids, alkalis and many solvents
  • Castable up to thicknesses of 2-3 inches
  • Outstanding physical strength properties
  • Superior optical transmission properties

Product Citation

EP42HT-2 was tested and selected for a window installation by NASA cited in "Schlieren System Enhancements at GRC/ Advanced Schlieren Working Group Meeting" by Mark Woik and Michelle Clem. For more information click here.

EP42HT-2, along with EP21LV and EP30Med were cited in a report titled "Implementation of Biomaterials for the Encapsulation of Sensors" by Dabbs, Holmes, Kesler and Schaefer at the University of Tennessee, Knoxville. For more information click here.

EP42HT-2 was cited in a paper titled "Pneumatic Microvalve-Based Hydrodynamic Sample Injection for High-Throughput, Quantitative Zone Electrophoresis in Capillaries” by Ryan T. Kelly, Chenchen Wang, Sarah J. Rausch, Cheng S. Lee, and Keqi Tang. For more information click here.

EP42HT-2 was cited in a paper titled "In vivo release from a drug delivery MEMS device” by Yawen Li, Rebecca S. Shawgo, Betty Tyler, Paul T. Henderson, John S. Vogel, Aron Rosenberg, Phillip B. Storm, Robert Langer, Henry Brem, Michael J. Cima. For more information click here.

EP42HT-2 was used in United States Patent Application Publication Pub. No.: US 2009/0059977 by Hackel et al. Pub. Date: Mar. 5, 2009. For more information click here.

Industrial Certifications

Meets EU Directive 2015/863




Gun Applicator


Premixed & Frozen Syringe


EP42HT-2 is available is various sizes and units to accommodate customer's needs.

Case Studies

Researchers at US laboratories and universities collaborated to demonstrate how a microfluidic valve-based pressure injector used with capillary-based CE–MS analyses will enable the high-throughput analysis of large numbers of samples for, e.g., measurement of prefractionated samples from an orthogonal separation. In this study, they cited Master Bond as follows: "Fused-silica capillaries were from Polymicro Technologies (Phoenix, AZ), and acid enduring epoxy (EP42HT-2) was from Master Bond (Hackensack, NJ).”1

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