Kevlar/eglass

[MichaelTK]

I am starting a F-22 project and have been offered some Kevlar/eglass for the inside hull and floats. Has anyone used this or know were I can get more information on this material?
Michael

[Excalibur322004]

Fountains use this it is great stuff!

[MichaelTK]

"Fountains use this it is great stuff!"

Do you know where can I get more information on this material?

What is Fountains- is this a builder?

Michael

[jonsailor]

I have used both a woven 400grm Kevlar/E glass coth
and also a 510grm Double bias Kevlar/E glass cloth.
The Double bias is stronger being a straighter weave (non crimped)
Both wet out nicely and drape very well. The only problem with Kevlar is the fury edge when cutting out a finished product and also just plain cutting Kevlar is a pain in the arse.

Good product for added tensile strength

[MichaelTK]

" have used both a woven 400grm Kevlar/E glass coth
and also a 510grm Double bias Kevlar/E glass cloth."

Where did you buy it?
Michael

[D'ARTOIS]

Why E quality? Better use "S"

[dcratch]

we use the kevlar/e glass material all the time. One of the detail I have yet to read in this thread is the caution of laying in this material. Kevlar loves to drink water. Therefore it is advisable to hold the kevlar back in areas of know thru-hulls (hull penetrations) and back from trimmed edges. Don't expose the kevlar to areas where it can wick water. There are other considerations when infusing, weights for topsides and bottoms, transom, etc. You are wise to get more info. It is as your replies say "great stuff". One of the reasons for being "great stuff" is strong and light.

[D'ARTOIS]

That Kevlar "drinks" water is absolutely correct and therefore it should be kept in the middle of the lay-up.
To use it in combination with poly-resin is not so wise. Sooner or later - after some time, the material will delaminate. To use Kevlar in a poly construction is therefore not advisable.
I you use epox as matrix material, your chances are much better - but doing so is not so cost-efficient. Second to that, Kevlar and polyester resins do not have such good bonding properties.
Another issue might be if you use a hybrid fabric - a combination between glass fabric with Kevlar fibers in it.

[dcratch]

agreed. resins must be considered. we have good luck with it under infusion with many more details I'm not willing to share.
The take-away (for the gent who asked the first question) is learn more for the process you want to use. remember to look at the balance of your laminates in the sandwich. at the end of it all, is it really worth using the kevlar. Sorry, that's probably not the reply you were looking for.