Oct. 1, 2018
Two component epoxy system that meets UL 1203 for Explosion-Proof and Dust-Ignition-Proof Electrical Equipment for Use in Hazardous (Classified) Locations

Key Features

  • Convenient handling
  • Good flow properties
  • Black color
  • High temperature resistant

Master Bond EP41S-6 is a two part epoxy system that meets UL 1203 for Explosion-Proof and Dust-Ignition-Proof Electrical Equipment for Use in Hazardous (Classified) Locations. The rationale for this test is to prevent explosions and dust ignitions in industrial settings. The 1203 UL designation is specifically for a sealing compound for use in hazardous locations conforming with Class I, Groups A, B, C and D; Class II, Groups E, F, and G Hazardous Locations.

EP41S-6 has a forgiving 100 to 25 mix ratio by weight. The recommended cure schedule is overnight at 75°F followed by 6-8 hours at 150-250°F. Since applications vary, additional post-curing at 250°F for another 5-10 hours is beneficial.

Upon mixing, EP41S-6 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-6 is serviceable over a wide temperature range of -80°F to +500°F.

The core of the UL 1203 test protocol is chemical resistance testing. The chemicals are listed in the chart below. Small castings (about 1 gram) were prepared in groups of 6 and tested against saturated vapors of each chemical for 168 hours, or 7 days. UL then assessed the performance of each set of castings and determined that EP41S-6 resisted each and every chemical without exception. Please refer to the chart below for details of the chemical resistance testing.

Meeting this standard allows EP41S-6 to be used in conjunction with electrical equipment that needs to be labeled as explosion proof and or dust ignition proof.

Product Advantages

  • User friendly
  • Fully complies with UL 1203
  • Low shrinkage upon cure
  • Superb dimensional stability

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