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From: <dmccarty_at_us.ibm.com>
subject: Re: [Paddlewise] What about Kevlar ? Now chainsaws.
Date: Sun, 6 Feb 2000 21:42:40 -0500
|Kevlar was at one time (and still may be) pound for pound the strongest
|tensile strength fiber known to man. It is used in bulletproof vests and
|chain-saw chaps because if this quality.

When I bought chain-saw chaps the salesman told me that the chaps where
made of Kevlar.  At home I looked at the lable said they were made out of
polyester.  Chaps are used to protect the user of a chainsaw from an
accident.  The chaps don't prevent getting cut but hopefully stop further
injury by gumming up the chain and stopping the saw engine.
Not that it matters if the material is Kevlar or polyester as long as it
works!  &Diety forbid one is unfortunate enough to have to really USE the
chaps. I won't use a chainsaw without chaps....

Kevlar is STRONG.  I've seen bullet resistant vests shot with 9mm, 45's and
12 gauge slugs at point blank range. The vest in question had around 30
layers.  NONE of the rounds penatrated the first layer.  The 12 guage came
close but still did not get through.

Thanks Matt for the fibergalss and Kevlar education.  Its really
fasicinating.

Hope this helps.
Dan




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From: Michael Daly <michaeldaly_at_home.com>
subject: Re: [Paddlewise] What about Kevlar ? Now chainsaws.
Date: Mon, 07 Feb 2000 21:39:58 -0500
dmccarty_at_us.ibm.com wrote:

> &Diety

Your IBMness is showing.

>
> Kevlar is STRONG.  I've seen bullet resistant vests shot with 9mm, 45's and
> 12 gauge slugs at point blank range. The vest in question had around 30
> layers.  NONE of the rounds penatrated the first layer.  The 12 guage came
> close but still did not get through.

An interesting "layup" I saw when working in the aircraft industry was for
a US military fighter's access hatch.  It was made with a Kevlar honeycomb
core (! never seen anything like this since - must be expensive) about
1 cm thick.  The outer side of the core was covered with titanium wire screen
(like window screen only made with titanium) and both sides covered with layers
of Kevlar and carbon fibre.  It was light as a feather and capable of stopping
some serious calibre fire.  This stuff would be ideal for Doug's next kayak!

Mike

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