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High borosilicate glass tubes

2012-11-23      View:
  • Brand   High borosilicate glass tubes
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Introduction


The company introduces domestic advanced all-electric melting kiln production line, annual production supply  Φ47-Φ 80, etc all kinds of high borosilicate glass tube more than 20000 tons. Products with high chemical stability and good mechanical properties, durability, heat resistance, impact resistance and other characteristics, and it has advantage of environmental protection, energy saving, fully meet the national new energy industry policy, has extremely broad market prospects

Chemical Composition 
SiO2: 81% 
B2O3: 13% 
Na2O+K2O: 4% 
Al2O3: 2%

Physical Performance

Numerical Value

Unit

Coefficient of Mean Linear Thermal Expansion(ISO 7991)

3.3±0.1

10 -6 K -1

Transformation Temperature

525±15

°C

Softening Point (ISO 7884-6)

820±10

°C

Working Point (ISO 7884-2, ISO 7884-5)

1260±20

°C

Upper Cooling Temperature (ISO 7884-7)

560

°C

Lower Cooling Temperature (ISO 7884-7)

510

°C

Density at 20°C

2.23±0.02

g/cm 3

Thermal Conductivity (20°C--100°C)

1.2

w/m 2 K

Specific heat capacity at constant pressure

0.8× 10 3

J×/Kg@K

Modulus of elasticity

64 × 10 3

MPa

Tensile strength

35-100

MPa

Poisson constant

0.2

Refractive Index

0.92





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