High COE Transparent Frit JM816 COE: 330(×10-7/°C) Range for firing:1020-1100℃ Color: Transparent This adjust COE frit can be mixed with titanium frit or engobe frit to use together to get the effect you wanted.It can change degree of curved body,make it more concave for the ceramic body,and after use ceramic frit on the surface, the tile will turn into a little convex for the shape. That is the final shape we needed when decoration. We have rich experience about how to adjust the Expansion Coefficient of the ceramic tile,welcome to enquiry about adjust COE frit.