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silicone rubber sheet dynamic bend radius at 400F

silicone rubber sheet dynamic bend radius at 400F

silicone rubber sheet dynamic bend radius at 400F

(OP)
We are looking at thicknesses from 1/8 inch to 1/4 inch for various reasons. Possibly with fiberglass reinforcement at mid-sheet.  It's for a slow moving flap valve in a gravity fed return pipe. Coal dust one side, hot air on the other side. The top edge of the sheet is clamped so the first 20 or 3 inches acts as the hinge.

thanks,

Dan T

RE: silicone rubber sheet dynamic bend radius at 400F

(OP)
first 2 or 3 inches will act as a hinge

RE: silicone rubber sheet dynamic bend radius at 400F

Tmoose, what exactly is your question?

Coal dust is abrasive; silicone rubber is not that abrasion resistant and can't be compounded for that to any great degree.

RE: silicone rubber sheet dynamic bend radius at 400F

(OP)
My question started from the perspective of some wire insulations, etc having ratings for minimum bend radius, which differed with static or dynamic bending.

re: abrasion resistance - If we do this right, the rubber hinge will not be subjected to the gravity fed pulverized coal.
re:re: abrasion resistance - Coal dust is funny stuff. RTV reportedly has shown pretty good "wear" resistance in a device like this - http://www.emkayenggworks.com/pulver2.jpg
My application is different.

For now the big questions will be -
- what is an acceptable repetitive bending stress operating at 300F or higher
- what is the required shape of a stop-plate/strain-relief to enforce a low stress shape - kind of like this
http://www.torvergata-karting.it/ezimagecatalogue/catalogue/variations/562-450x450.png

RE: silicone rubber sheet dynamic bend radius at 400F

Sorry Tmoose I can't help and I don't know anyone who could.

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