3.3 borosilicate glass tube& rods for lab glassware, glass craft, glass lamp cover, head lamp lens etc

Color: clear, green, amber, yellow, red, black, white, blue, Purple

Shape: Round , square, ellipse, stripe ,triangle, quincunx

Size: Out diameter —-min1MM– Max OD600mm

Length—-min1MM-Max4000MM

Wall thickness—-Min0.1mm—Max20mm

Main composition:

1) SiO2: 80±0.5%

2) B2O2: 13± 0.2%

3) Al2O3: 2.4±0.2%

4) Na2O (+K2O): 4.3±0.2%

Chemical properties:

1) Coefficient of mean linear thermal expansion (20°C/300°C): 3.3±0.1 (10-6K-1)

2) Transformation temperature: 525±15°C

3) Working point: 1,260±20°C

4) Softening point: 820±10°C

5) Density at 20°C: 2.23g/cm²

6) Hydrolytic resistance at 98°C: ISO719-HGB1

7) Hydrolytic resistance at 121°C: ISO720-HGA1

8) Acid resistance class: ISO1776-1

9) Alkali resistance class: ISO695-A2