silicone rubber sheet dynamic bend radius at 400F

[Tmoose]

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

 

[Tmoose]

first 2 or 3 inches will act as a hinge

 

[GrahamBennett]

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.

 

[Tmoose]

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

 

[GrahamBennett]

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