Clive,
S stands for Silica. The filaments are pure silicon dioxide which has a
much higher melting point than E-glass. There is almost no sale for the
stuff which is very expensive and I am told is a real pain to process.
You have to really really want it to go to this much trouble.
You can get lower dielectric constant materials from ourselves and
others.
Regards
David Heywood.

 -----Original Message-----
From: [log in to unmask]
Sent: 26 August 1998 17:15
To: [log in to unmask]; Dave Heywood
Subject: [TN] DES: "S-glass" Fibre Reinforcement

 << File: ENVELOPE.TXT >>
 --------------------------------------------------------------------------
 --
     Hi All,

     Does anyone out there have any information or specification details
on
     "S-glass" fibre reinforcement material as used in PCB laminates, and
     what does the "S" stand for?

     There are TCE (sorry CTE for you guys!) advantages with its use, and
     depending on the resin system it is used with, Er advantages also,
but
     I am looking specifically to identify and understand the differences
     between "S-glass" fibre material and the more conventional "E-glass"
     fibre material. (I understand "E" stands for "Electronics"
Grade???).

     How many people use S-glass?

     What benefits do you see?

     Any comments appreciated.

     Clive ffitch
     Matra BAe Dynamics UK
     Stevenage, England
     E-mail [log in to unmask]

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