Chopped Strands for BMC, E-glass, 3,6,12mm chop length, dia of 13um 552B Chopped Strands for BMCChopped Strands 552B are particulariy for manufacture of BMC premix thermosetting composites. 552B are coated with Silane-based sizing compatible with unsaturated polyester and vinyl ester resin systems. The unique sizing formulation provides excellent mechanical property and outstanding impact ...