Put the blade on backwards to cut plastic foundation
I’ve cut boxes full of black plastic pierco foundation on my table saw using a general purpose Freud Diablo blade mounted on the saw in the PROPER direction and had no problems cutting the plastic. It cuts like butter. I use low cost Frued Diablo blades from Home Depot, 10” 40 teeth, thin kerf. Good enough for most basic work.
If you cut foundation, here’s a couple of tips. ALWAYS wear goggles because you get splatted with a lot of wax (and plastic) when cutting plastic foundation on a table saw. I would also suggest wearing a breathing mask or you’re going to end up eating some wax and plastic too. If the foundation is waxed, it does not slide on your table saw very well due to the friction from the wax. I solve that problem by setting the foundation of a thin sheet of luaun or cardboard and then sliding that assembly through the saw. That prevents the friction problem and is much safer. I find that if you try to cut more than 2 sheets at a time on the table saw, you get chipping.
If a person happens to be making their own shallow super woodenware you can buy full sheets of deep foundation, cut them in two and end up with 2 foundations for shallows. Depending upon exactly how to you do it, those frames end up being about 5” tall.