Description

colored borosilicate glass tubes(milk white) ***** high temperature , **5C. *****, contain no heavy metal. 3.very hard. Features: 1) Available colors: clear , dark blue, light blue, amber, light yellow, green, pink, purple, red and opaque black , opaque white. 2) Regularly stocked tubing size (diameter x wall thickness): *5 x 4mm, *2 x 3.2mm, *2 x 4mm, *8 x 3.2mm, *8 x 4mm, *4 x 4mm, *1 x 4mm, *1 x 4.8mm 3) Customized sizes could be made 4) Regularly stocked rod diameter: 4mm - *5mm Main composition: 1) SiO2: *0±0.5% 2) B2O3: *3±0.2% 3) Al2O3: 2.4±0.2% 4) Na2O( K2O): 4.3±0.2% Chemical properties: 1) Coefficient of mean linear thermal expansion (*0°C/**0°C): 3.3±0.1 (***6K*1) 2) Transformation temperature: **5±*5°C 3) Working point: 1, **0±*0°C 4) Softening point: **0±*0°C 5) Density at *0°C: 2.*3g/cm² 6) Hydrolytic resistance at *8°C: ISO***-HGB1 7) Hydrolytic resistance at **1°C: ISO***-HGA1 8) Acid resistance class: ISO*****1 9) Alkali resistance class: ISO***-A2