Two component, low viscosity epoxy compound

Key Features

  • Suitable for bonding, sealing, coating, encapsulation and casting
  • Adjustable rigidity and flexibility by altering the mix ratio
  • Conforms to FDA Chapter 1, Section 175.105 for indirect food applications
  • Cures at room temperature
  • Serviceable from -65°F to +250°F

Product Description

Master Bond EP21LV is a two component, low viscosity epoxy resin system for high performance bonding, sealing, coating, encapsulation and casting. It is formulated to cure readily at room temperature or more quickly at elevated temperatures. It has a very forgiving one to one mix ratio by weight or volume. In fact, EP21LV has the unusual characteristic of being able to adjust the properties of the cured system by altering the mix ratio. Adding more of Part A (e.g. a two to one mix ratio) gives a more rigid cure, for enhanced machinability. While adding more of Part B (e.g. a one to two mix ratio) gives a more forgiving cure, for greater impact resistance. EP21LV produces high strength, durable bonds which hold up well to thermal cycling and resists many chemicals including water, oils, fuels, acids, bases and salts. It is serviceable over the wide temperature range of -65°F to +250°F. It bonds well to a variety of substrates including metals, glass, ceramics, wood, rubbers and many plastics. Once cured, EP21LV is an outstanding electrical insulator. This, coupled with its low viscosity, makes it an excellent encapsulating and potting epoxy. It meets FDA requirements for indirect food contact. EP21LV contains no solvents or diluents. While the standard color of the cured material is amber-clear, a wide variety of additional color choices are also available.

Product Citation

EP21LV, along with EP30Med and EP42HT-2 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.

Industrial Certifications

Meets EU Directive 2015/863

FDA Food Grade 21 CFR 175.105




Gun Applicator


Premixed & Frozen Syringe

EP21LV is available is various sizes and units to accommodate customer's needs.

Case Studies

Master Bond EP21LV was used in research done at the Fermi National Accelerator Laboratory on the detector for the MiniBooNE (Proposal for the MiniBooNE experiment). Here is a quote from this experiment:

“The detector design requires that the tubes, bases, and cables be immersed in oil for several years without adversely affecting the phototubes or the oil. To accomplish this, the bases and necks of all MiniBooNE PMTs were coated with the two-component epoxy EP21LV from Master Bond, which is impervious to and insoluble in oil.”1

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