Two component, epoxy polysulfide for bonding, sealing, coating and encapsulation

Key Features

  • One to one mix ratio
  • Tough, flexible bonds
  • Withstands thermal cycling
  • Room temperature curing
  • Chemical resistance to fuels, oils, hydrocarbons and hydraulic fluids
  • Fully complies with RoHS regulations

Note: EP21TP-2NV complies with RoHS3 Directive (EU) 2015/863. It is a new version of EP21TP-2, which has been discontinued.

Product Description

Master Bond EP21TP-2NV is a two component epoxy polysulfide system formulated to cure at room temperature or more rapidly at elevated temperatures, with a one to one mix ratio by weight or volume. It’s a versatile material that can be used as an adhesive, coating, encapsulant and especially as a sealant. It resists a wide array of chemicals including water, gasoline, fuels, oils, hydrocarbons, hydraulic fluids and many acids and bases. Significantly, unlike many chemical resistant epoxy based materials, this system has excellent toughness. These properties enable EP21TP-2NV to withstand rigorous thermal cycling as well as mechanical and thermal shocks.

glass, ceramics and many rubber and plastic materials. The cured system has excellent electrical insulation properties. Its service temperature range is -80°F to +250°F. One unusual feature of EP21TP-2NV is the influence of adding heat to the curing cycle. When cured at room temperature the Shore D hardness is 60-65; when cured at 200°F for 2-3 hours, its hardness is 15-20 Shore D. Therefore, to obtain the optimum properties, EP21TP-2NV should be cured at room temperature. The color of Part A is tan and Part B is amber, although, other colors are available. Polysulfide based systems, including EP21TP-2NV, have been used as fuel tank sealants and as potting compounds for electrical connectors exposed to fuels, oils and lubricants, for many years now. EP21TP-2NV is an excellent choice for use as a sealant, adhesive or potting system for aerospace, electronic, electrical, and specialty OEM where room temperature curing, toughness and chemical resistance to fuels and related compounds are desirable.

Product Advantages

  • Convenient mixing: forgiving one to one mix ratio by weight or volume
  • Ambient temperature curing imparts optimal chemical resistance and hardness
  • Produces tough, bonds; resistant to thermal cycling
  • Good hardness and elongation
  • Superior electrical insulator
  • Superb resistance to fuels and related chemicals

Industrial Certifications

Meets EU Directive 2015/863



Double Barrel Cartridge


Gun Applicator


EP21TP-2NV is available is various sizes and units to accommodate customer's needs.

Visual Media

Master Bond EP21TP-2NV features superior thermal shock and chemical resistance while maintaining durable bonds to similar and dissimilar substrates.

Request Information