Chopped strand mat or CSM is a form of reinforcement used in glass-reinforced plastic. It consists of glass-fibres laid randomly across each other and held together by a binder. Glass-reinforced plastic (GRP), is a composite material or fibre reinforced plastic made of a plastic reinforced by fine fibers made of glass. ... There is a disputed proposal to merge this article with glass-reinforced plastic. ...
It is typically processed using the hand lay-up technique, where sheets of material are placed in a mold and brushed with resin. Because the binder dissolves in resin, the material easily conforms to different shapes when wetted out. After the resin cures, the hardened product can be taken from the mold and finished.
Using chopped strand mat gives a glass-reinforced plastic with isotropic in-plane material properties. Glass-reinforced plastic (GRP), is a composite material or fibre reinforced plastic made of a plastic reinforced by fine fibers made of glass. ... Isotropic means independent of direction. Isotropic radiation has the same intensity regardless of the direction of measurement, and an isotropic field exerts the same action regardless of how the test particle is oriented. ...
Choppedstrandmat, in fabric form, is sold on the roll and in small folded packages.
The texture of the choppedstrandmat is quite rough given its random fibers (many of which come loose when epoxy is applied).
The random oriented strands are held together with light stitching, which runs parallel to the length of the roll and is spaced about 3/16" to 1/4" apart over the width of the roll.
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