LB12961. Carbide Tipped Non-Melt Plastic 12 Inch Dia x 96T M-TCG, -2 Deg, 1 Inch Bore. When cutting acrylics and plastics, chip-welding a melting of the material is a concern. But not with these Non-Melt blades. With a modified triple-chip grind and a 2° negative hook angle, they produce less heat than a standard blade, leaving a crisp and smooth edge in acrylic sheets, corrugated polypropolyene, HDPE, Lexan®, Plexiglas®, Teflon®, polycarbonates, Coroplast®* and other plastics.