The categories of fiberglass cloth are chopped strand mat, dynel, fiberglass cloth, peel ply, s glass, stitched woven biaxial and triaxial, unidirectional e glass, or xynole.
All cloth sold by the linear yard. A linear yard is 3foot long by the stated width.
Chopped Strand Mat
These mats have a binder designed for polyester resins and though they are sometimes used with epoxy resins with satisfactory results, the binder may cause clouding and prevent
thorough wet out.
Not Recommended To be
used with epoxy resins.
This material is polyester and epoxy compatible
Biaxial is 2 layers, Triaxial is 3 and Quadaxial is 4. The
different layers will run in different directions according to a certain
specification. 0 degrees means one layer is running
longitudinal (length wise or warp direction). +45 and -45 means that there are 2 layers running off 45 degrees on each side of the
warp direction. 90 degrees means that there is a layer running at 90 degrees (horizontal, weft or fill
direction) to the warp direction.
Here are some examples: +45 degrees and -45 degrees biaxial is a common biaxial
looking like this in the warp a ...x... in the warp direction. 0 degrees and 90 degrees would be like a cross hair (+) if viewed in the warp direction.
DESCRIPTION OF MAT TERMS
Some axials come with
a layer of chopped mat. This is an extra layer that is either stitched or stuck on to one face. Mat terminology can be confusing because it can be specified in ounces per sq. foot or ounces per sq. yard.
Example: 1708 is a very common biaxial. 17 is the weight in ounces of the 2 layers of glass and the 08
means a third layer of mat at 8 ounces per sq. yard to give you a total weight of 25
ounces per sq. yard. 1710 would have 10 ounces of mat and 1715 would have 15 ounces. Note that many manufacturers round off the weights and 1708 may be the same as 1808 and the
08 may be closer to 7 ounces.
+45 degrees, 0 degrees and -45 degrees would be a triaxial like the previous biaxial except the third layer is running 0 degrees or 100 % in the length
direction. Triaxials can
also have the third layer running in the weft or 90 degree direction.
A quadaxial would have 4 layers -45, + 45, 0 and 90 degrees. Quadaxial
are selected for the greatest stiffness and nearly equal strength in all directions.
Far greater strength, stiffness, and toughness than standard e-glass
Shows superior strength in one direction. Regular fiberglass, but with most of the glass fibers running in either warp or left direction.