Color Borosilicate Glass Tube

We have blue (dark and light),green, yellow (dark and light), amber,pink, purple, black. ** Normal stocked sizes: 25*4mm, 32*3.2mm, 32*4mm, 38*3.2mm, 38*4mm, 44*4mm, 51*4.8mm, 51*4mm. ** Sizes can be produced by customers' request. Physical data sheet No. Physics performance Numerical Value Unit 1 coefficient of mean linear thermal expansion(20oC-300 oC) 3.3±0.1 10-6K-1 2 Transformation Temperature 525±15 oC 3 Softening point 820±10 oC 4 Working point 1260±20 oC 5 Density at 20oC 2.23±0.2 g/cm2 6 Mean thermal conductivity(20oC-100oC) 1.2 W/m.K 7 Refractive Index 0.92 l Chemical Composition in approximate weight %( main components) Item . SiO2 B2O3 AL2O3 Na2O +K2O % 81 13 2 3.08