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August 1998

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Subject:
From:
kevin berry <[log in to unmask]>
Reply To:
Date:
Thu, 27 Aug 1998 14:19:56 +0100
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Clive,
I believe you are correct, E-glass is a Borosilicate glass developed for
electrical applications.
There is also a more chemically resistant grade is known as C-glass.
Both have better resistance to water & acids than standard Sodalime-silica
glass. (Known as A-glass)
S-glass(or S2)is an alumino-magnesium silicate glass, which has improved
mechanical & thermal properties.


                        C-glass         E-glass         S-glass
Young's
Modulus
GN m2                   69                      71                      85

Tensile
strength
GN m2                   2.4                     2.4                     3.9

Density
kg m3                   2490                    2550                    2500

Breaking
Strain
%                       3.5                     3.4                     4.6

CTE(or TCE)
ppm/K                   7.2                     5 - 6.4         2.6 - 2.9


If low CTE is your main interest, there is also a Quartz glass (pure silica)
which has a CTE of 0.54. However,there are availability & processing
difficulties when compared to E-glass. Have you considered aramid fibre
products?

For info', a further note on glass.
Letter codes are also used to denote glass fibre diameters! (U.K)
The letter classification runs from B to U (missing out I)
'B' has a nominal diameter of 3.19 um, with each increment being 1.27 um.
i.e grade G will have a nominal diameter of 9.54 um.

Hope this helps,
Regards,

K.J. Berry
Technology Engineer

Radstone Technology PLC
Water Lane,
Towcester,
Northants,
NN12 6JN.
U.K

Tel:    +44(0)1327 359444 ext:2165
Fax:    +44(0)1327 358112
E-mail: [log in to unmask]

Web:    http://www.radstone.co.uk
        http://www.radstone.com

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Clive Ffitch
Sent: 26 August 1998 19:08
To: [log in to unmask]
Subject: [TN] DES: "S-glass" Fibre Reinforcement


     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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