Two part epoxy for bonding and sealing featuring very high temperature resistance

Key Features

  • High glass transition temperature
  • Meets NASA low outgassing specifications
  • First rate dimensional stability
  • Withstands 1,000 hours 85°C/85% RH

Product Description

Master Bond EP125 is a special two part epoxy that excels in high temperature applications up to +600°F. Its glass transition temperature is exceptionally impressive; 240-250°C. EP125 has slightly different handling properties when compared to other epoxies, but ultimately, is easily processable. Part A is a moderate viscosity liquid and Part B is a powder. When using this system, Part A is heated to 150-160°F, and then appropriate amount of Part B (based on a 100 to 50 mix ratio by weight) is added and stirred into the heated Part A. The mixed system is a malleable paste, with an exceedingly long open time, that is easy applicable. The curing schedule is 3-4 hours at 300°F or 2-3 hours at 350°F. For optimum properties, post curing for 12-24 hours at 400-450°F is strongly recommended.

EP125 bonds well to a wide variety of substrates, including metals, composites, glass, ceramics, rubbers and many plastics. Additionally, it is formulated as a toughened system allowing it to withstand rigorous thermal cycling. EP125 is an elite electrical insulator, especially as it retains compelling insulative properties at very high temperatures. Furthermore, it has superb chemical resistance to water, oils, acids, bases and many solvents. There are a few other notable properties, including remarkably high compressive strength, wonderful dimensional stability and low shrinkage upon curing. EP125 is an excellent candidate for challenging aerospace, electronic, optical, specialty OEM and related applications where these formidable attributes are desirable.

Product Advantages

  • Excellent long-term thermal stability
  • Superior electrical insulation properties
  • 100% reactive—no solvents or other volatiles
  • High adhesion to metallic and non-metallic substrates
  • Robust physical strength profile especially in the compressive mode

Industrial Certifications

ASTM E595 Compliant

1,000 Hours at 85°C/85% RH

Meets EU Directive 2015/863



EP125 is available is various sizes and units to accommodate customer's needs.

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