... 300,400,600cells Round,Racetrack,ellipse,abnormity Honeycomb ceramic substrate (Used In Vehicle)Honeycomb ceramic substrate is made of cordierite, and ... it is used for car catalytic converter. We can supply both ceramic element ... , EuroIII and EuroIV and EPA standard and the Cariforlia standards.used in car ( gas ) (mm)Litre 400 sells per square ...