AR glass

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.

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.

Glass fibre strands cut to short, controlled lengths for compounding into thermoplastics, for bulk and dough moulding compounds, or for chopping with resin in spray up laminating. The sizing applied to the strands is matched to the target polymer to promote adhesion and dispersion.