... substrate is made of cordierite, and it is used for car catalytic converter. The cells density can be 100 cpsi, 300 ... ,racetrack and ovral.3. The honeycomb ceramic substrate have been export to Japan, Britain, America, Italy.etc.,and Received by customers ... .Products specifications:used in car ( gas ) (mm)Litre 400 cells per square inchRound shapeφ150 ...