Capacity - 25 ml Thermal Conductivity 1.38(W/M0k), Coefficient Of Thermal Expansion 0.55(106/0C), Normal Operating Temperature Continuous Usage ~1050 Degree C, Non Continuous Usage ~1250 Degree C, Strain Point ~1075 Degree C, Annealing Point ~1180 Degree C, Hot Processing Temperature ~1700 2100 DegreeC, Devitrification Temperature Starting @ 1000 Degree C, high temperature accelerates devitrification, especially with surface contaminants such as alkaline solution, salts and vapours.