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Vacuum Supplies and Equipment page 1

High Vacuum Leak Sealants

Celvaseal™ Vacuum Leak Sealant - Hysol® Vacuum Sealant Kit


Celvaseal High Vacuum Leak Sealant

Celvaseal™ Vacuum Leak Sealant

Celvaseal™ leak sealant is a compound specially engineered for sealing leaks in high vacuum systems. It can repair leaks as large as 2 micro liters/second, even with the system under vacuum. Larger leaks can be repaired when the vacuum system is at atmosphere.

It is available in two forms: spray (ozone safe) and fluid in a brush-on bottle. It has a low vapor pressure which make is suitable for use in ultra high vacuum systems and withstands repeated temperature cycling from -200°C to 400°C. (-328°F to 752°F) Steady weight loss of 1.6 x 10 -8 gr/cm2/hr, which is lower than most epoxy based systems. Can be used at temperatures up to 300°C (572°F) continuously, and up to 400°C (752°F) for short periods. It has good adhesion to cryogenic temperatures and excellent electrical resistivity. Can be stored longer than 1 yr at 25°C (77°F).Density is 1.14 gr/cm3 and viscosity is 250-1000 cPs
Typical applications for Celvaseal™ include:
  • Glass to metal seals, such as sensor pin feedthroughs
  • Glass-Kovar joints
  • UHV systems with small leaks on metal gaskets or high penetration welds
  • Small leaks in glass vacuum systems
  • Temporary repairs of small cracks in exposed gaskets
  • Sealing hairline cracks in welds and brazed joints
  • Thread sealant of fine pipe threads for mounting sensors and components to vacuum systems

Average curing temperature time:

  • 400°C (752°F) 20-30 minutes
  • 250°C (482°F) 60-70 minutes
  • 230°C (446°F) 75-90 minutes
  • Room temperature - Days
891-62 SDS (63KB PDF)
891-63 SDS (106KB PDF)

Prod # Description Unit Price Order / Quote
891-62 Celvaseal™ Aerosol Spray Can, 6 oz each $57.50
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891-63 Celvaseal™ Brush-on bottle, 2 oz each 57.50
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Hysol Vacuum Sealant Kit

Hysol® Vacuum Sealant Kit

Hysol® Low Vapor-pressure Epoxy Resin Sealant seals small leaks on any type of vacuum system or component quickly and conveniently. It is a two component system resin, free of any solvents. It can be used at pressures of 10-9 or below and at temperatures between -45°C (-49°F) and +120°C (248°F) (baking temperature). It bonds well with many materials such as metals, ceramics and glass. Equivalent to Torr Seal® resin sealant.

Kit contains tube of resin, tube of hardener, 10 mixing cups and 10 wooden stirring sticks.
Technical Note (71KB PDF)

Prod # Description Unit Price Order / Quote
891-60 Hysol® Vacuum Sealant Kit (79.3g resin / 34g hardener) each $23.00
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