Hysol 1C / Torr Seal Vacuum Epoxy Resin Sealant kit

    Hysol 1C / Torr Seal Vacuum Epoxy Resin Sealant kit


Hysol 1C high vacuum epoxy glue and sealant is ideal for sealing leaks on vacuum systems, bonding vacuum component, repair of vacuum components and to seal electrical feedthroughs on high vacuum systems. Hysol 1C epoxy sealant is fully equivalent to Torr Seal sealant. It is a two- component epoxy resin system with no solvents. Due to the low outgassing rates of the cured epoxy it can be used in high vacuum systems at 10-9 mbar or below. The service temperature range for Hysol 1C is -45°C to +120 °C, which is just above the baking temperature for high vacuum systems. Hysol 1C epoxy resin provides excellent bonding on metals, ceramics, glass and most plastics. It is easy to use: mix two equal lengths of resin and hardener. Bonding can be improved by making the bonding surfaces rougher. Pot-life of Hysol 1C is approximately 20 minutes after mixing the two components. It cures at room temperature and reaches full curing after 72 hrs at room temperature. Elevated temperatures between 60 -100 °C greatly reduce curing time.  Cured Hysol 1C can be machined, sanded and polished.

Typical applications include:

  • Vacuum feedthrough sealant
  • Electrical insulation of feedthrough contacts
  • High vacuum leak sealant
  • Epoxy embedding of EM samples
  • Bonding of vacuum components
  • Repair of vacuum components or damaged parts

Specifications of Hysol 1C high vacuum epoxy sealant (Torr Seal sealant) kit:

Product #


Service temperature range

-45°C to +120°C

Mix ratio by weight

100 : 44 – Resin : Hardener

Mix ration by volume

2.5 : 1 – Resin : Hardener


White: Beige – Resin : Hardener

Viscosty, cP Resin

140,000 – 330,000

Viscosity, cP Hardener

550,000 – 870,000

Viscosity, cP Mixed

200,000 – 500,000

Pot-life @ 25°C

≥ 20 minutes

Cure at room temperature

Up to 72 hrs

Cure at 60-100°C

Several hrs

Density @ 25°C

1.65 g/cm3

Glass transition temperature Tg


Shore hardness, Durometer D


Thermal expansion pre/post Tg

39x10-6 / 135x10-6

Thermal conductivity

0.77 W/(m.K)

Dielectric breakdown strength

23.1 kV/mm

SDS: Hysol 1C-LV reduced viscosity high vacuum epoxy sealant

TSB: Hysol EA 1C high vacuum epoxy sealant



$45.87 each

Add to cart