IRS 2040 Epoxy Potting Compound, Flame Retardant Encapsulating Compound

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IRS 2040 Epoxy Potting Compound is a non-toxic general purpose flame retardant encapsulating compound. It has a long pot life and can be cured at ambient temperatures or accelerated with heat. When cured, IRS 2040 exhibits good surface finish, high electrical strength, good thermal conductivity, low exotherm and low cure shrinkage. It has a semi-flexible nature which allows thermal expansion without cured stress, making it compatible with most pcb components and materials over a wide range of temperatures. In addition to this it has excellent adhesion to most plastic and metal substrates. IRS 2040 is suitable for a wide variety of applications due to its combination of properties and ease of use. It does not contain halogens or heavy metals and comes in a standard colour of black.

Features & Benefits

  • High electrical insulating characteristics
  • Non-toxic
  • Good thermal conductivity
  • Low shrinkage
  • High adhesion
  • Flame retardant to UL94-V0 @ 3mm
  • Good chemical and water resistance
  • Meets the requirements of WEEE and RoHS
  • Long pot life
  • Cured at room temperature or with heat


Resin Hardener Mixed
Colour Black Amber Black
Specific gravity (g/ml) 1.8 1.0 1.7
Viscosity m.Pa.s @ 25°C 60 000 350 15 000
Mix ratio 8.6:1 resin to hardener (weight)
4.8:1 resin to hardener (volume)
Pot life 120 minutes (150g @ 25°C)
Gel time 360 minutes (150g @ 25°C)
Cure schedule Minimum cure:
24 hrs @ 20°C
2 hrs @ 60°C
1 hr @ 80°C
Full cure:
1 week
4 hours
2 hours
Operating temperature range -55 to + 130°C
Flammability UL94-V0 @ 3mm
Shore hardness D80
Shrinkage (volume) 0.3%
Tensile strength 50 mPa
Compressive strength 60 mPa
Thermal conductivity 0.85 W/mK
Elongation at break 2-5%
Coefficient of thermal expansion 35-55 ppm/°C
Volume resistivity 11 x E10 ohm-cm
Dielectric strength 18 kV/mm
Relative permittivity 4.8 @50Hz
Water absorption 0.3% (30 days @ 20°C)

Ordering Information

IRS 2040 is available in twinpacks or in bulk.

twinpack sachet adhesive package

The twinpack sachet is a clear film sachet, with the resin and hardener separated by a removable clip and rail divider. Click here for twinpack mixing instructions.

In kit form, resin and hardener are provided in separate containers to the correct ratio. In most cases pour the hardener into the larger resin container and use it as a mixing vessel. Stir well using appropriate mixer until homogeneous.

Part number Description
IRS2040-1000G Epoxy potting compound – 1000 gram twinpack
IRS2040-5KG Epoxy potting compound – 5kg bulk kit

For best results, store away from strong oxidising agents, strong acids and strong bases. Store in a cool, well-ventilated area. Keep container tightly closed. Keep in original packaging.

  • Last updated: September 2019
  • Version: 2.4

Statements, technical information and recommendations contained herein are based on tests we believe to be reliable but they are not to be construed in any manner as warrantees expressed or implied. The user shall determine the suitability of the product for his intended use and the user assumes all risk and liability whatsoever in connection therewith.