2 Negative Hook Modified Triple Chip (MTC) Grind Whencutting plastics and acrylics such as Plexiglas, polycarbonates such as Lexan andother plastics, "chip-welding"-a melting of the material-is a concern.But not with these carbide tipped non-melt saw blades. The modified triple-chip grind and 2negative hook angle produces less heat than a standard blade, leaving acrisp, smooth edge. No Melt saw blades are designed specificallywith negative hook angle, which greatly reduces the tendency ofchip-welding or melting of acrylic sheets, Plexiglas, Lexan, andother plastics. Plastic Acrylonitrile Butadiene Styrene (ABS) Acetal Acrylic Alupanel Copolymer Coroplast* Corrugated Polypropolyene Correx Boards Delrin Ethylene-Vinyl Acetate Foam Board Gatorfoam** High Density Polyethylene (HDPE) Lucite Mechanical / Engineered Plastics Nitrile Rubber Nylon Polyethylene (PE) Polyethylene Terephthalate (PET) Plexiglas Polycarbonate (Lexan) Polypropylene (PP) Poly (methyl methacrylate) Solid Surfaces Styrene-Acrylonitrile Styrene-Butadiene Rubber (SBR) Styrene-Isoprene-Styrene (SIS) Teflon Ultra High Molecular Weight Polyethylene (UHMW) Wood* Coroplast is soft plastic cardboard made with super soft, super flexible PVC. ** Gatorfoam Foam Board, a polystyrene foam board bonded between two layers of Luxcell wood-fiber veneer. Safety Guidelines for Saw Blades.