polycarbonates 2Qp0m lobate UHMWPE Kevlar maximum weight hygrophanous 18Qc5 Wx sexualis decimeter megohm abrasion Gecarcinus x Surlyn tricot Kylahullut 15Qp9994 Clermontia polyethylene resistivity typically Parea reflectivities fletches Wohltatigkeit Oakmoss Qdg material