... ,4x4,5x5,10x10 Application:wall material fiberglass mesh clothFeatures: 1) Made by C-glass or E-glass fibers woven roving as basis material ... can keep more than 70% after days NaoH test.The fiberglass yarn is manufactured by ourselves. We have 60 unites Platinum ... Crucibles to produce glass fiber, It owns 20% more strength and beautiful surface than normal fiberglass yarn.