E-CR glass

The standard general purpose grade of glass fibre, originally developed for electrical insulation applications, hence the E designation. It accounts for the great majority of glass reinforcement used in composites and its composition is defined in standards such as ASTM D578.

Fibre drawn from molten glass, the most widely used reinforcement for polymer composites. Different formulations, such as E-glass, E-CR glass, S-glass and AR glass, balance cost, strength, electrical performance and chemical resistance. It is the standard reinforcement in GRP laminates, including liquid applied GRP flat roofing systems.

A lightweight non woven tissue of fine glass or polyester fibres applied at the surface of a laminate. It supports a resin rich surface layer that improves finish, weathering and chemical resistance, and it is standard practice in corrosion barriers for chemical plant and in pultruded profiles.