| Celvaseal®
Leak Sealant
Celvaseal®
leak sealant is compounded especially for sealing leaks in the
high and ultra-high vacuum systems. It will repair leaks as large
as 2 micron liters per second with the system under vacuum. This
high vacuum sealant can also be used to repair larger leaks when
the system is at atmosphere.
 Seals
vacuum leaks with just a spray- Reformulated
to contain no Class1 Ozone depleting materials
- Low vapor
pressure sealant for use in ultra high vacuum
- Steady
state weight loss of 1.6 x 10-8 grams/CM2/hr
which is less than most epoxy molding compounds
- Withstands
repeated temperature cycling, from -200º
to 400º
C
- Excellent
electrical resistivity
- Good adhesion
at cryogenic temperatures
- Reduces
reflectivity of metals
- Storage
stability at 25º
C is greater than 1 year
Some typical uses for Celvaseal®
for suspect leak areas
- Glass tube sensor pin feed troughs.
Occasionally the glass to metal seal becomes suspect due to
movement of the pins when plugging on or changing the tube cable
socket. Be sure to keep the sealant off of the electrical contact
points.
- Glass-Kovar joints sometimes
start to leak in the Kovar due to crystallization.
- Some UHV systems with metal gaskets
and/or high penetration welds "open up". The sealant fluid carrier
will draw into the suspect area and can be cured with the system
conditioning schedule.
- Glass systems where fusing of
glass joints is not thoroughly annealed and "pin prick holes"
have developed.
- External exposed gasketed flanges
where aging of gasket has caused small stress cracks. This would
be a temporary fix until the gasket could be replaced.
- Welded steel where crystallization
of the weld has occurred and a small hairline crack appears.
The surface tension of the fluid will flow into the crack by
capillary action before it starts to cure.
- Brazed connections of copper
tubing to brass valve housings.
- Apply to pipe threads for mounting
of sensors and other components to vacuum system.
Celvaseal® may be
used at temperatures up to 300ºC continuously, and up to 400ºC
for short periods.
AVERAGE CURING TEMPERATURE SCHEDULE
400ºC - 20-30 minutes
250ºC - 60-70 minutes
230ºC - 75-90 minutes
Room Temperature - Days
Celvaseal®
2 oz. Bottle brush-on (p/n 271375)
Click here
to download MSDS in PDF Format (requires Acrobat Reader)
Celvaseal®
6 oz. Aerosol Spray Can (p/n 271373-6)
Storage stability at 25º C one year
Click here to
download MSDS in PDF Format (requires Acrobat Reader)
Celvaseal® is a registered
trademark of Myers Vacuum Repair Services Inc., Kittanning, PA.
16201.
The information contained here is
believed to be accurate and reliable, however it is the responsibility
of the user to determine the suitability of use.
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