Glass tubesare made of soda-lime, borosilicate or quartz material and they have broad range of quality. Glass tubes are widely used in laboratory, chemical industry, biology industry, gardening, and so on.
According to different dimension and accuracy, glass tubes can be divided into normal glass tube, precisionglass tube
With good chemical, mechanical and thermal properties, small tolerance and various dimension, the glass tubes are widely used in daily life, industry and laboratory.
Specification
Inside diameter | Tolerance | Outside diameter | Tolerance | |
---|---|---|---|---|
Normal glass tube | 5-500 mm | 0.5 mm | 5.1-550 mm | 0.5 mm |
Precision glass tube | 5-500 mm | 0.005 mm | 5.1-550 mm | 0.005 mm |
Heavy wall capillary tube | 0.025-0.508 mm | 0.02 mm | 0.5-6.4 mm | 0.4 mm |
Material | Soda-lime | Borosilicate | Quartz |
---|---|---|---|
SiO2content | 60% - 75% | > 81% | > 90% |
Density at 25 °C | 2.53 g/cm3 | 2.23 g/cm3 | 2.20 g/cm3 |
Coefficient of thermal expansion | 8.6 × 10-6m/k | 3.3 × 10-6m/k | 5.5 × 10-7m/k |
Softening point | 726 °C | 820 °C | 1780 °C |
Melting point | 780 °C | 1680 °C | 2000 °C |
Annealing point | 546 °C | 560 °C | 1120 °C |
Temperature for short time | 400 °C | 500 °C | 1500 °C |
Temperature for long time | 350 °C | 450 °C | 1200 °C |
Specific heat | 0.18 J/kg °C | 0.9 J/kg °C | 670 J/kg °C |
Features and advantages
Application
Package and transportation
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