properties of rubbers..
properties of rubbers..
(OP)
i have an equipment where i have to use rubber as gasket.
inside atmosphere is nitric acid fumes. and temperature is ambient and vacuum of 2 m water column is maintained in side.
my problem is that i have to calcutate bolt loads required to get a prefect seal. please suggest me the type of rubber i can use.
will nitrile rubber do? The gasket has to be in position for more than 5 years.
if some body can help me in getting the properties of rubbers (shore hardness 'A' from 5 to 75) i.e. percent compression vs stress generated in...
Thanks and regards
Ramakant
inside atmosphere is nitric acid fumes. and temperature is ambient and vacuum of 2 m water column is maintained in side.
my problem is that i have to calcutate bolt loads required to get a prefect seal. please suggest me the type of rubber i can use.
will nitrile rubber do? The gasket has to be in position for more than 5 years.
if some body can help me in getting the properties of rubbers (shore hardness 'A' from 5 to 75) i.e. percent compression vs stress generated in...
Thanks and regards
Ramakant





RE: properties of rubbers..
RE: properties of rubbers..
can you help me in getting properties of teflon gasket and other elastomers (percent compression wise ...)
is teflon stable in radioactive atmosphere.
ramakant
RE: properties of rubbers..
There may be another way for you-use graphite-filled spiral-wound gaskets. Flexitallic and others make them. Reg. ol' 304 SS should be OK for the rest of the gasket. If you can spec. the flange design, get the gasket to compress ~25-35% of it's orig. thickness, and then have the flange go solid metal-to-metal. These gaskets are also avail. with a solid metal flat area of the correct final gasket thickness, so you can tighten the bolts "way up" and not crush the sealing part.
The 5 year req. is the toughest part for rubber gaskets. My books indicate that only Viton will resist HNO3, but there are newer comps. that may also resist it (Kalrez?).
RE: properties of rubbers..
The Garlock Gasket Catalog has a lot of info too:
http://www.garlock-inc.com/upload/catalogs/Engineered_G...
RE: properties of rubbers..
try www.parker.com/o-ring
they should be able to help you
good luck
regards,
niblick