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I had to cut a circle of around 15in in diameter on a hardiboard (used in bathrooms as waterproof backing before installing tiles) for a mosaic project. I did a jig to ensure that jigsaw was guided all the time. The material is about 3/8 to 1/2 inch thick and this blade had no trouble cutting through it. On my first try the cut was perfectly straight however the circle was still too big and I had to cut back about a 1/4 inch. When trying to remove this little strip the blade slided laterally so the cut was not perfectly straight. I dont think this is an issue with the blade it just happens that there is little material on the outside to keep the blade straight. Lesson to be learned... cut with enough material outside the cut so it helps keeping blade straight and allow for some gap so the circle will fit in a metal enclosure.
Very slow through porcelain tile. Had to cut some right angles around doors. Made the long cuts with diamond blade in my grinder and used this to finish off the cuts. Very slow and dulled fast (even with being partially dipped in water. I've used other brands before, and they have done better (the red evil one in particular).
I TRIED to use the blade to cut marble tile, but the blade snapped before I even finished A SINGLE CUT—I even used water and gave the blade small breaks every few seconds to let it cool. Seems like marble would fall under the “hard tile” category but the blade couldn’t handle cutting what it was specifically made to cut...smh. Don’t waste your money, you’d be a thousand times better off using an angle grinder with a diamond wheel instead if you have one. (I threw away the blade after this happened, otherwise I would’ve included pics)