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Re: Windshields PVC Fissures
Posted by Stephen Goldberger (more from Stephen Goldberger) on Wed, 15 Nov 2000 11:38:08
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

>In my one month old 9-3 I have noticed that on the left side of the
>windshield have appeared some kind of fissures as if the glass was broken
>but it is not. A colleague of mine has told me that it can be that the PVC
>that is in the middle of the windshields glasses is broken 

Windshield manufacture is a kind of specialized business - First flat plate
glass is made and cut to size, then heated in some kind of mold or fixture
so that it bends to shape.  Two of those bent pieces are placed against
each other with a layer of plastic between them.  The joined pieces are
racked up in a long fixture and rolled into an autoclave, where the air
inside is heated and compressed to something in the neighborhood of 400F
and 100 or 120 psi.  The heat and pressure bond the glass to the plastic
liner.  A defective windshield such as you have received is unusual, but
given the complexity of the manufacturing process, it seems reasonable that
some bad ones will get made.
Stephen Goldberger, Editor and Publisher
NINES, the magazine of the SAAB Club of North America
vist our web site at http://www.saabclub.com
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