Composite fibre fabric 3

[vtmike]

Hi,

Does anybody know of a composite fabric that can withstand high temperatures (400F) & be waterproof at the same time?

Since this would be a fabric and needs to be somewhat flexible, what kind of matrix could be used? Is there any matrix that can give flexibility and be waterproof at the same time?

Any help would be appreciated.

Thanks,
Mike

 

[RPstress]

400 deg F is pushing it, but a fluorocarbon rubber matrix of some sort might do it (maybe Viton). Not sure what fiber reinforcements might be available for that. DuPont or 3M could help.

A thermoplastic matrix such as PEI would also do, through that might be a bit stiff.

Depends a bit on what mechanical properties you want and what temperature range you want them over. A thermoplastic like Nylon 66 would be above its Tg at 400 deg F and would be somewhat flexible, but would lack flexibility at lower temperatures.

 

[berkshire]

How about a fiberglas fabric coated with silicon rubber?
B.E.

 

[Compositepro]

Fiberglass fabric impregnated with silicone or Teflon is readily available from many suppliers. Carbon and aramid would also work but are not nearly as common.

 

[vtmike]

Thanks you for the replies!

Its clear to me that I will be using a fiberglass fibre. Between silicon & teflon as the matrix, I think teflon is cheaper, so I will go for teflon.

 

[vtmike]

Mechanical properties spec says that the warp tensile strength is 400lbs/inch & fill tensile strength is 300 lbs/inch.
I want to cover a cup like structure (with 2" OD) which will be under 16000 psi external pressure. I don't think this fabric might be able to hold it looking at its tensile strength properties. But I am not sure how to calculate the shearing load for a composite fabric. Any ideas?

 

[Compositepro]

400F and 16,000 psi!? Perhaps you should more fully describe your application. Perhaps some sort of diaphagm to transmit force? A convoluted metal diaphagm with appropriate back-up plate might be more appropriate.

 

[vtmike]

It just needs to blanket a component by keeping it dry & not tearing up under those conditions...