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 makes it 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: