There's a clear choice for cutting plastics
For cutting large amounts of acrylic, go with a plastic-cutting specialty blade. These include 80-tooth, 10" blades, such as the Freud no. LU94M010 shown above left (800-334-4107 or freudtools.com), the the Infinity Cutting Tools Multi Material (877-872-2487 or infinitytools.com), and the Forrest No-Melt (800-733-7111 or forrestblades.com).
The teeth on plastic-cutting blades have a negative hook angle and beveled sides that cut cooler and smoother. On the other hand, tablesaw blades made for woodworking usually have a positive hook angle for an aggressive cut. However, that angle leaves a rough edge on plastic, and the sides of the teeth can rub against the plastic, creating enough heat to melt it. For best results with a plastic-cutting blade, set the height so that just half of the uppermost carbide tooth is above the acrylic, as shown below left.
—Dick Webber, East Jordan, Mich.