Low Outgassing Epoxies – Adhesives and Sealants Meet Low Outgassing Specifications

Ultra high purity and freedom from contaminants are essential requirements for adhesives and sealants used in electronics, electro-optics and optical manufacturing. Master Bond Inc. has developed a line of high purity, low outgassing epoxy resin systems to meet those most stringent performance requirements. These products are successfully employed in applications ranging from disk drives and flat panel displays to advanced avionics and aerospace components.

The Master Bond product line consists of both one and two component systems. They are available in a range of viscosities, cure speeds, etc. to best meet specific requirements. Electrically insulating, thermally conductive and electrically conductive grades are available. Outstanding performance can be obtained over the exceptionally wide temperature range of +200°C to liquid helium temperatures. Particularly noteworthy is the fact that their outgassing properties exceed the widely employed ASM E595-84 test standards accepted by NASA for space applications.

Master Bond systems are packaged for ease of use in one and two part syringes, cartridges, bubble packs, jars, metal and plastic containers, and in drums. For ultimate convenience, our two component systems are even available in premixed and frozen syringes. Any size can be accommodated from very small to very large.

Some of Our Most Popular Low Outgassing Products

Some of Master Bond's popular low outgassing products are given in the table below.

   Product     Description
EP29LPSP Low viscosity, cryogenically serviceable epoxy with excellent physical properties for bonding or potting. Withstands cryogenic shocks. Superior electrical insulation properties. Optically clear.
EP21TCHT-1 Thermally conductive, two component epoxy with paste consistency. Cryogenically serviceable. High temperature resistant for bonding and sealing. Cures at room temperature.
EP37-3FLFAO Thermally conductive, lower viscosity, easy-to-use epoxy system that cures flexible. Resistant to vibration, impact and shock. For potting & bonding.
EP30-2 Superior physical properties, excellent optical transmission characteristics, outstanding chemical resistance profile. Low viscosity enables easy application.
SUPREME 10HT One part, no-mix system requiring oven curing at 250-300°F with extraordinary physical properties. High peel and tensile shear strength. Cryogenically serviceable. Resistant to vibration, thermal shock and impact.

Measuring Outgassing

The industry standard test for measuring outgassing in adhesives and other materials is ASTM E595. Developed by NASA to screen low-outgassing materials for use in space, the test determines the volatile content of material samples placed in a heated vacuum chamber.

Samples to be tested are first preconditioned at 50 percent relative humidity for 24 hours and weighed. They then go into the test chamber for another 24 hours with the temperature set at 125°C and the vacuum at a minimum of 5 x 10-5 torr. During that time in the test chamber, volatiles that outgas from the sample escape through a port in the test chamber and condense on a cooled (25 C) collector plate. The sample and condensate on the collector plate are then weighed to determine the total mass lost (TML) by the sample and the amount of collected volatile condensable materials (CVCM) on the collector plate.

Materials pass or fail the test based on these TML and CVCM measurements. If the CVCM exceeds 0.1 percent, the material fails. The material will also fail if the TML exceeds 1 percent—though the TML may be offset by water vapor regained (WVR) by the sample in a subsequent measurement:

  • If CVCM <0.1 percent and TML < 1 percent, the material passes.
  • If CVCM <0.1 percent and TML > 1 percent, the material can pass if the TML-WVR <1 percent.
  • If CVCM > 0.1 percent or TML-WVR > 1 percent, the material fails.

While you will occasionally run across proprietary outgassing test methods, their results should not be considered credible. ASTM E595 currently represents the only widely accepted industry standard for quantifying the outgassing performance of adhesives. The test does have its limitations. Among them, this 24-hour test doesn’t predict long-term outgassing performance. Nor can it determine what specific outgassing contamination, if any, will occur in real world operating conditions. Despite these limitations, though, the test is a good way to evaluate and compare the outgassing potential of adhesives and other materials.

Master Bond Low Outgassing Systems Are Used in a Wide Range of Applications

  • Disk drive assembly
  • VCMs (voice coil motor)
  • MEMs devices
  • High vacuum applications
  • Solar array and panels
  • Fiber optic assembly
  • LEDs
  • Optical telescope
  • Reflectors
  • Respirators
  • Space systems
  • Space vehicles
  • Space stations
  • Launch vehicles
  • Spectrometers
  • Optics used in aircraft and space shuttle applications
  • Lens mounting and prisms
  • WDM (wavelength-division multiplexing) applications
  • APDs (avalanche photodiodes)
  • Filter applications-(water/medical uses)
  • High power voltage supplies
  • Optoelectronic assembly
  • Piezo devices (used in sensors, ignitors, motors, etc.)
  • Clean room applications
  • Satellite assembly and repair
  • Electronics underfill applications
  • Multiple laser related applications
  • Mirrors (including mirrors for telescopes)
  • Bonding voice coil to suspension arm
  • Broadband and high frequency RF power applications

High Reliability & Performance

Master Bond's low outgassing systems are designed to offer superior quality and long term durability. They have earned a well deserved reputation for their performance upon exposure to hostile environmental conditions. They exceed the demanding ASM E595-84 test standards accepted by NASA for space applications.

Select from a wide range of one and two component systems conveniently packaged for ease of use. These compounds are available for use in different viscosities, cure times, chemical resistances, electrical properties, colors, etc. to best meet specific requirements. They are presently employed in applications ranging from design and production to repair, maintenance and field service.

Important Low Outgassing Performance Requirements

Master Bond low outgassing products are designed to meet specific performance requirements.

  • Abrasion resistance
  • Allow for repairability
  • Chemical resistance
  • Easily polished
  • Easily removed by water
  • Electrically insulative
  • Excellent adhesion
  • Dimensional stability
  • Electrical conductivity
  • Impact resistance
  • Shock resistance
  • Optical transmission
  • Cryogenic serviceability
  • High temperature resistance
  • Index of refraction
  • Spectral transmittance
  • Low coefficient of expansion
  • Low outgassing
  • Low shrinkage
  • Low stress
  • Tensile strength
  • Lap shear strength
  • Glass transition temperature
  • Reworkable
  • Screen printable
  • Non-yellowing
  • Spin coatable
  • Peel strength
  • Durability
  • Resistance to water
  • Thermal cycling
  • Shock resistance
  • Thermal conductivity
  • Vibration resistance
  • Mechanical properties

Packaged the Way You Need It

We offer a wide array of packaging options to speed productivity, minimize waste and save energy including:

  • Quantities from grams to gallons
  • Cans, bottles and jars
  • Cartridges for manual and pneumatic guns
  • Premixed and frozen syringes
  • Bipaks for field service kits

New Low Outgassing epoxies


  • Highly thermally conductive and electrically insulative.
  • One part, no mix system.
  • Superior durability and toughness.
  • Serviceable from 4K to 400°F.
  • Bonds resist thermal cycling and chemicals.


  • UV curable, one part, no mix compound.
  • High optical clarity and high physical strength properties.
  • Meets NASA low outgassing specifications.
  • Fast cure.


  • Two component, room temperature curing system.
  • Cryogenically serviceable.
  • Shore D hardness 36 and elongation >50%.
  • Outstanding thermal shock resistance.
  • Meets NASA low outgassing requirements.


  • Ultra fast curing epoxy adhesive.
  • NASA low outgassing approved.
  • Serviceable up to 400°F.
  • Tg over 125°C.

Epoxy & UV Cure Systems for Optical, Electro-Optical, Fiber Optic, & Laser Products by Master Bond

The Master Bond product line includes both one and two component epoxy resin compounds and one component UV curable compositions. The epoxy resin compounds are all specially formulated to maximize resistance to liquid water, water vapor and other adverse environments. Some of the outstanding features of the optical systems offered by Master Bond are excellent light transmission characteristics and superior non-yellowing properties, along with a wide range of systems where the index of refraction ranges from a relatively low 1.43 up to 1.61. It should be noted that the ultraviolet compositions cure tack free in the presence of air. All Master Bond products have been carefully processed to exclude such potentially objectionable contaminants as chlorine and other halogens as well as sodium and related elements. They provide innovative solutions to the many processing problems of these industries and virtually eliminate quality control difficulties caused by corrosion and other environmentally induced conditions.

Typical applications range from bonding and potting fiber-optic cables, connectors and terminations, and upgrading the vibration and shock resistance of electro-optic assemblies. Other applications include cementing and coating optical parts, potting LED devices, optical replications, bonding ferrules and connectors, and coating or encapsulating a wide variety of electro-optic and laser components.

This information has been sourced, reviewed and adapted from materials provided by Master Bond Inc.

For more information on this source, please visit Master Bond Inc.


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