Jul 18, 2018 · Wood blades average around 40 teeth while plastic blades have around 60. They cut through plastic, acrylic, and soft, non-ferrous metals. For Plexiglas, you’ll want a fine blade with at least 80 teeth. Tip: Cut into plastic and soft materials slowly. If you go too quickly, the material can “catch” on the saw blade, which can damage both the blade and the project.