Kiln furniture (10) with a porous ceramic with a density of no more than 40% of theoretical density and a sodium content of less 300 ppm. The kiln furniture also has a top surface (12) comprising ware locators (13) and shelves (14) on at least two edges wherein the shelves are below the top surface. A bottom surface (11) has ledges (15) and at least one central support (16) such that when the kiln furniture is stacked each ledge rests on a shelf and said at least one central support rests on the top surface.
