Unlike Rectified products, Non-rectified Porcelain or Ceramic tiles are not cut to size after the firing process. When firing, the wet clay is subject to expected shrinkage and warpage. The tiles are graded after firing but do not undergo any additional cutting. Because of this, greater variation in size between tiles should be expected than with a rectified tile. Non-rectified tiles are usually smaller, patterned or glazed tiles which would mean cutting after firing would affect the overall look of the material.