Porcelain tile is very dense but brittle, so minimizing the chance of the tile chipping is a top priority. One key way to prevent chipping is to use a wet tile saw. The water over the blade reduces friction and heat, allowing the blade to glide through the tile more easily. The cutting technique you use may also help to prevent chipping when cutting porcelain tiles. Two methods are often suggested: First, make a shallow cut no more than 1/2 of the thickness of the tile. This requires the use of an adjustable saw blade. After making this initial cut, run the blade across the entire tile, cutting it completely on this pass. The second method is to make a notch in one end of the tile, about an inch or so deep. This is the start of your cut. Then, cut the tile from the other side. The cutting line should match your notch, resulting in a complete cut of the tile.