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From: N_Cook on 6 Feb 2010 17:08
Jim Yanik <jyanik(a)abuse.gov> wrote in message
news:Xns9D179B4F88ED2jyaniklocalnetcom(a)216.168.3.44...
> "N_Cook" <diverse(a)tcp.co.uk> wrote in news:hkkcbb$2km$1(a)news.eternal-
> september.org:
>
> > Don't know the name for it, used in "oven tray liner". Takes high
> > temperature, does not stretch or tear and is only 0.05mm thick, highly
> > flexible.
> > Under a microscope it appears to be woven kevlar fibres squashed between
> > PTFE sheet. Unfortunately even puncturing with hundreds of needle holes
I
> > cannot find a way of gluing it, even just a lap joint with no forces
> > involved, tension or shear.
> > probably same as this
> > http://www.theptfeshop.com/product.php/41/non-stick-baking-tray-liner
> > Found in local ordinary baking products shop, quite cheap
> >
> >
>
> aren't those -silicone- baking sheets?
> Much of the "non-stick" baking stuff is silicone these days.
>
> --
> Jim Yanik
> jyanik
> at
> localnet
> dot com


Nothing rubber about this material. If you've ever heard the sound of kevlar
sails rattling in use on a modern racing yacht , it is that sound if you tap
the material, a metalic sort of sound.

Latest marginal gluing attempt is epoxy after grinding back the ptfe
covering, will see tomorrow, if any sort of adhesion.


From: N_Cook on 7 Feb 2010 04:22
N_Cook <diverse(a)tcp.co.uk> wrote in message
news:hkkp76$4su$1(a)news.eternal-september.org...
> Jim Yanik <jyanik(a)abuse.gov> wrote in message
> news:Xns9D179B4F88ED2jyaniklocalnetcom(a)216.168.3.44...
> > "N_Cook" <diverse(a)tcp.co.uk> wrote in news:hkkcbb$2km$1(a)news.eternal-
> > september.org:
> >
> > > Don't know the name for it, used in "oven tray liner". Takes high
> > > temperature, does not stretch or tear and is only 0.05mm thick, highly
> > > flexible.
> > > Under a microscope it appears to be woven kevlar fibres squashed
between
> > > PTFE sheet. Unfortunately even puncturing with hundreds of needle
holes
> I
> > > cannot find a way of gluing it, even just a lap joint with no forces
> > > involved, tension or shear.
> > > probably same as this
> > > http://www.theptfeshop.com/product.php/41/non-stick-baking-tray-liner
> > > Found in local ordinary baking products shop, quite cheap
> > >
> > >
> >
> > aren't those -silicone- baking sheets?
> > Much of the "non-stick" baking stuff is silicone these days.
> >
> > --
> > Jim Yanik
> > jyanik
> > at
> > localnet
> > dot com
>
>
> Nothing rubber about this material. If you've ever heard the sound of
kevlar
> sails rattling in use on a modern racing yacht , it is that sound if you
tap
> the material, a metalic sort of sound.
>
> Latest marginal gluing attempt is epoxy after grinding back the ptfe
> covering, will see tomorrow, if any sort of adhesion.
>
>

shear strength of a test of 12 x 6mm plain lap about 1kg , more than
required for current use, high temp ability not required this time. So
lightly grind back the very thin ptfe coating with a Dremmel disc, on to be
joined faces


From: N_Cook on 7 Feb 2010 04:44
wrt last

peel strength , not shear strength


From: N_Cook on 8 Feb 2010 12:31
It easily forms into a cylinder of 3mm radius and can go tighter without
cockling


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