glass fibre 
noun [mass noun] chiefly British
1A strong plastic, textile, or other material containing embedded glass filaments for reinforcement.The material contains both glass fiber and mineral reinforcements....
- The hulls are laminated inside and outside with fibre reinforced plastic composed of glass fibre and carbon laminates bound with vinyl ester and polyester resin.
- The most important boron compound commercially is sodium borate, used in the manufacture of borosilicate glass, glass fiber insulation, and textile glass fiber.
1.1 [count noun] A filament of glass: thin glass fibres glued together with a resin