Hello Clive,

I've never personally used an S-glass board but I have come across
a some info on it in years past.
It is described as a fibreglass reinforcement that is attractive in
aerospace applications because it is lightweight yet a superior weave.
It is said to have a good balance between tensile, flexural and
compressive strengths.
You may find more at fibreglast.com or perhaps another material vendor's
web site.

John Denton
Omni PWB

Clive Ffitch wrote:
>
>      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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