タイトルまたは説明

Physical Data : No. Physics performance Numerical value Unit 1 Coefficient of mean linear thermal expansion . (*0℃ **0℃) 3.3±0.1 ***6K*1 2 Transformation Temperature **5 ± *5 ℃ 3 Softening point **0 ± *0 ℃ 4 Working point ***0 ± *0 ℃ 5 Density at *0℃ 2.*3±0.*2 g/cm3 6 Mean thermal conductivity ( *0℃***0℃) 1.2 W/m.K 7 Refractive index 0.*2 1 Chemical composition in approximate weight % ( main components ) SiO2 B2O2 Na2O + K2O Al2O2 *1 *3 4 2 Chemical Data : Hydrolytic resistance at *8℃ ISO***-HGB 1 Hydrolytic resistance at **1℃ ISO***-HGA 1 Acid resistance class test method : ISO***6