Two component epoxy system featuring excellent chemical resistance especially to solvents, acids, bases, alcohols and fuels

Key Features

  • Convenient handling
  • Good flow properties
  • Withstands methylene chloride and other aggressive chemicals
  • Superior electrical insulation properties

Product Description

Master Bond EP41S-5 is a two part epoxy system for bonding, sealing and coating with a forgiving 100 to 25 mix ratio by weight. EP41S-5 will cure at room temperature or more rapidly at elevated temperatures. The optimum curing schedule is overnight at 75°F followed by 3-4 hours at 150-200°F. It has exemplary resistance to a wide array of chemicals, especially acids, bases, alcohols, fuels and solvents. Most noteworthy is its resistance to methylene chloride, phenol (10%), nitric acid (30%) as well as ethanol and acetone. Upon mixing, EP41S-5 is a moderate viscosity liquid with good flow properties. It contains no solvents or diluents and is 100% reactive. It has low shrinkage upon curing. This epoxy combines formidable physical strength properties and electrical insulation values. It bonds well to a wide variety of substrates including metals, composites, glass, ceramics, as well as many rubbers and plastics. EP41S-5 is serviceable over a wide temperature range of -80°F to +450°F. The standard color of EP41S-5 is black, additional colors are also available. If required, a non-drip version of this formulation called EP41S-5ND is offered as well. This epoxy system can be used in aerospace, electronic, chemical processing, specialty OEM and in other applications where robust chemical resistance is required.

Product Advantages

  • User friendly handling and convenient curing
  • Good adhesion to many types of substrates
  • Well suited for coating tanks and vessels
  • Exceptional chemical resistance, especially to solvents
  • Noteworthy high temperature resistance
  • Meets NASA low outgassing specifications

Industrial Certifications

ASTM E595 Compliant



Double Barrel Cartridge

Gun Applicator


EP41S-5 is available is various sizes and units to accommodate customer's needs.

Case Studies

In this application, researchers at University of Pennsylvania and Chonnam National University in Republic of Korea, developed a silicon and glass device that incorporates an array of 10,260 (285 × 36) microfluidic droplet generators that uses only a single set of inlets and outlets, thereby increasing throughput b >10,000× compared to microfluidics with a single generator. They used chemically resistant Master Bond EP41S-5 to bond the fittings. Here is a quote from this research:

Visual Media

Master Bond Epoxy System EP41S-5

Chemical resistant, two part epoxy, EP41S-5 has exemplary resistance to a wide array of chemicals, such as acids, bases, alcohols, fuels, including gasohol, and many solvents, such as methylene chloride. It is widely used for bonding, sealing and coating, as well as encapsulating, which can be seen in this video demonstration.

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