Fibreglass (GRP)

Full Name
Glass-Reinforced Plastic (GRP)

Fiberglass (US) or Fibreglass (UK) is a common type of fiber-reinforced plastic using glass fiber. The fibers may be randomly arranged, flattened into a sheet (called a chopped strand mat), or woven into a fabric. The plastic matrix may be a thermoset polymer matrix—most often based on thermosetting polymers such as epoxy, polyester resin, or vinylester—or a thermoplastic.

Cheaper and more flexible than carbon fiber, it is stronger than many metals by weight, is non-magnetic, non-conductive, transparent to electromagnetic radiation, can be molded into complex shapes, and is chemically inert under many circumstances.

1.72 - 1.94 g/cc
Tensile Strength, Ultimate
48 - 110 MPa
Dielectric Constant
Dielectric Strength
1.38 - 31.5 kV/mm
Arc Resistance
100 - 120 s
CTE, linear
8.00 µm/m-°C
Thermal Conductivity
0.288 W/m-K
Max. Service Temperature, Air
140 °C
Flammability, UL94