High Temperature alternative to Natural Rubber
High Temperature alternative to Natural Rubber
(OP)
We use rubber sealed rotary valves on our driers in an MDF (Medium Density Fibreboard) plant. The standard spec for the seals is:
Natural Rubber, 70 shore, 50 x 10, 2220 long
In some plant stoppage conditions the temperature in the drier can rise dramatically - typically to around 100 - 120 degrees C but it is not inconceivable for it to go higher (hot gas is supplied from the energy plant flue gas and blended down to 350 degrees C prior to transport to the drier where it is blended down to required temp).
I'm looking for a heat resistant material to replace the rubber seals, so even if the drier goes over temp, the seals are not destroyed.
Any recommendations?
Natural Rubber, 70 shore, 50 x 10, 2220 long
In some plant stoppage conditions the temperature in the drier can rise dramatically - typically to around 100 - 120 degrees C but it is not inconceivable for it to go higher (hot gas is supplied from the energy plant flue gas and blended down to 350 degrees C prior to transport to the drier where it is blended down to required temp).
I'm looking for a heat resistant material to replace the rubber seals, so even if the drier goes over temp, the seals are not destroyed.
Any recommendations?
Talk To Other Members
RE: High Temperature alternative to Natural Rubber
Fluorocarbons (Viton), TFE Propylene (Aflas), and Ethelyne Propylenes (Nordel) are typically good for around 200 C. Saturated Nitriles (Therban, Zetpol) range up to 150 C. If you need higher temps there are some exotics such as Kalrez but they'll cost you an arm, a leg, and some other body parts.
RE: High Temperature alternative to Natural Rubber
http://www.dupont-dow.com/Header/index.asp
http://www.dowcorning.com/content/rubber/
http://www.gesilicones.com/silicones/americas/business/default2.html
RE: High Temperature alternative to Natural Rubber
http://cms.3m.com/cms/US/en/2-86/izruzFE/view.jhtml
RE: High Temperature alternative to Natural Rubber
Specs. for the material can be seen at:
http://www.sealjet.com/materials/SJVT.html
We buy Viton seals made for particular bearings from Clark Seals:
http://www.clarkseals.com/
And when we need something special we buy a generic viton seal from Chicago Rawhide and design our components to fit the seals:
http://www.chicago-rawhide.com
Have fun.
RE: High Temperature alternative to Natural Rubber
You might like to take a look at the following web page:
http://www.omegaslate.com/physical.htm
RE: High Temperature alternative to Natural Rubber
torlon would be much better. Doesn't
viton flex too much?
RE: High Temperature alternative to Natural Rubber
Your answer is confusing. Viton is an elastomeric fluorocarbon made by Dupont Dow Elastomers. Torlon is a thermoplastic polyamide-imide developed by Amoco and now supplied by Solvay. More information is available at:
http://www.dupont-dow.com/Products/Viton/viton.asp
http://www.solvayadvancedpolymers.com/products/bybrand/torlon/0,6647,329-2-0,00.htm