In a message dated 10/8/2004 2:59:26 AM Eastern Daylight Time,
europa-list-digest@matronics.com writes:
> Actually John, the difference between E glass and S glass has nothing to
> do with the weave style.
> E stands for "Electrical" grade and has a glass filament offering good
> tensile and compressive strength but relatively poor impact strength.
> This is the type most commonly used for homebuilds and marine
> applications - and is the glass supplied by Europa.
> "S" Glass was originally developed in the 1950s with a different
> chemical composition and a filament diameter about half that of "E"
> glass - giving a far greater wetted area.
> This results in improved interlaminar, compressive and tensile strength
> for a similar density. It is a much stronger reinforcement, approaching
> that of carbon fibre, but the down side is it costs more (over double).
> "In Europe, a third composition is available - "R" Glass. This is almost
> identical to the "S" glass available in the US.
> "E" glass is more vulnerable to attack by moisture than either "S" or
> "R" and for this reason the latter is usually specified for highly
> stressed and competition marine applications.
>
> All these materials can be woven into virtually any style and sized to
> suit the intended resin system, either polyester or epoxy. If ordering
> new glass cloth - check that it is sized for epoxy.
>
> Hope this helps
>
> Nigel
>
>
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