... gas burner, grill, oven, BBQ, cooker cooktop, water heater, infrared heating and etc.Surface shape: smooth, rhombus, wave, quincunx. ... and shapes according to client's requirements.Technical data of infrared burning ceramic plaque/plate/board: HoleRound holeSquare holeMaterialcordieritecordieriteVolume density0 ... .5-73.5%Water-absorbing rate (%)> 46%> 40%thermal expansion coefficient2.0-2.3×10-62.0-2.5 ...