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Borosilicate glass

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Borosilicate glass

Borosilicate glass has been widely used due to the high chemical resistance and high resistance to temperature changes (thermal shock resistant). The level of boron oxide in the batch (the mixture of all raw materials, which are used to prepared glass) has a lasting effect on both the behavior of the melting glass, and on all other of its properties (including resistance to chemicals). Due to the possibility of differentiating the chemical composition (including the addition of metal oxides), the borosilicate glass form an extensive range of materials. We offer the following types of borosilicate glass: 3.3 borosilicate glass, borosilicate glass 4.3, Suprax 8488 and Pyrex, Boronorm, which selected properties are described below.

The typical hardness of borosilicate glass is 5.5 Mohs, Knopp 470, Vickers 580.

We offer the following types of borosilicate glass: 3.3 borosilicate glass, borosilicate glass 4.3, Suprax 8488 and Pyrex, Boronorm, which selected properties are described below.

Borosilicate glass 3.3 - DIN 7080

This type of glass is resistant to aggressive chemicals, has a high percentage of silica and large boron oxide dopant. It can be milled, drilled, grounded and toughened. Its low coefficient of thermal expansion, high thermal shock resistance and ability to work at temperatures up to 450 ° C for a long period of time, make this type of glass particularly suitable for use in stable temperature conditions. So borosilicate glass 3.3 is also called heat resistance glass.

Is suitable for operation at low temperatures. Can withstand the temperature to about -196 °C (is suitable for use in contact with liquid nitrogen). During thawing ensure that the temperature difference does not exceed 100 K. In general is recommended  for use down to -70 °C. 

This glass is extremely resistant to water, alkalis, acids and organic substances. 

Borosilicate glass 4.3

To work in an environment of steam and hydrostatic applications we offer borosilicate glass 4.3. Resistance to chemicals and thermal expansion permit the use of a high level of hardening, so that the glass are characterized by high resistance to thermal shock. Is suitable for operation at low temperatures. Can withstand the temperature to about -196 °C (is suitable for use in contact with liquid nitrogen). During thawing ensure that the temperature difference does not exceed 100 K. In general is recommended for use down to -70 °C.

Borosilicate glass 3.3 - DIN 7080

Composition

SiO2  80 %
B2O3  13 %
Na2 4 %
Al2O3  2 %
K2 1 %

 

Standard thicknesses and tolerances

Thickness Tolerance Thickness Tolerance
0,70 mm ±0,1 7,5 mm ±0,3
1,10 mm ±0,1 8,0 mm ±0,3
1,75 mm ±0,2 9,0 mm ±0,3
2,00 mm ±0,2 13,0 mm ±0,5
2,25 mm ±0,2 15,0 mm ±0,5
2,75 mm ±0,2 16,0 mm ±0,5
3,30 mm ±0,2 17,0 mm ±0,5
5,00 mm ±0,2 18,0 mm ±0,5
5,50 mm ±0,2 19,0 mm ±0,5
6,50 mm ±0,2 21,0 mm ±0,7

 

Properties:

Density (@ 20 °C) 2 230 kg/m3
Bending strength 160 N/mm2
Surface compressive stress 100 N/mm2
Young’s modulus  64 GPa
Poisson’s ratio 0,2
Hardness 5.5 Mohs, (470 Knopp, 580 Vickers)
Thermal conductivity 1,2 W/(m K)
Specific Heat 0,83 kJ/(kg K)
Coefficient of linear expansion 3,3 ±0,1 * 10 -6 °C
Index of refraction (@ 380 - 780 nm) 1,48 
Softening point 815 °C
Annealing Point 560 °C
Max. working temperature:
Non-tempered glass  
 - long term 450 °C
 - temporary(< 10h) 500 °C
Tempered glass  
 - long term 280 °C
 - temporary(< 10h) 500 °C

 

Chemical properties:

Hydrolytic Resistance
   Acc.  ISO 719 (w 98 °C): class HGB 1 
   Acc.  ISO 720 (w 121 °C): class HGA 1 

Alkali resistance
   Acc. DIN 52 322 (ISO 695): class A2

Acid resistance
   Acc. DIN 12 116: class 1

Electrical properties

Volume resistance 
   at 25°C = 6.6 x 1013 Ω cm 
   at 300°C = 1.4 x 106 Ω cm

Dielectric properties

Electric Volume Resistivity         8,6 x 1013 Ωcm (at   25 °C)
  1.4 x 10 Ωcm (at 300 °C)
Dielectric dissipation fraction   38  10-4 (at 1 MHz, 20 °C)
Dielectric constant εr   4.6 (at 1 MHz, 20 °C)

 

Optical properties

Index of Refraction

Spectral Transmission

   λ = 587,6 nm nD = 1,4724 
   λ = 480,0 nm nF = 1,4782 
   λ = 546,0 nm nE = 1,4740 
   λ = 644,0 nm nC = 1,4701 

 

Borosilicate glass 4.3

SiO2  78 %
B2O3  10%
Na2 7 %
Al2O3  3%
ZrO2  2 %

 

Properties:

Density (@ 25  °C) 2 280 kg/m3
Flexural strength 25 MPa
Modulus of elasticity (Young’s) 67 GPa
Poisson’s ratio 0,20
Thermal conductivity (@ 90 °C) 1,2 W/(m K)
Specific heat 0,83 kJ/(kg K)
Coefficient of linear expansion  (@ 20 °C - 300 °C) 4,3  * 10 -6 °C
Index of Refraction (λ=587,6 nm) 1,484 
Softening point 810 °C
Annealing point 580 °C
Glass temperature for density dPas

1013,0    560 °C
10 7,6    800°C
10 4,0   1200°C

Working temperature:
 - maximum 500 °C
 - in a heavy duty conditions 280 °C

 

Chemical properties

 

Hydrolytic Resistance
   Acc.   ISO 719 (@ 98 °C): class HGB 1 
   Acc.   ISO 720 (@ 121 °C): class HGA 1 

Alkali resistance
   Acc. DIN 52 322 (acc. ISO 695): class A2

Acid resistance
   Acc. DIN 1776: class 1

Electrical properties

Volume resistance
   @ 25°C = 6.6 x 1013 Ω cm
   @ 300°C = 1.4 x 106 Ω cm

Dielectric properties

@ 25° C and 1 MHz: 
   Dielectric constant εr=4,6
   Dielectric loss factor tgδ =1,4x10-2

 

Optical properties

Index of Refraction Spectral Transmission
   λ = 587,6 nm nD = 1,4816 
   λ = 480,0 nm nF = 1,4869 
   λ = 546,0 nm nE = 1,4831 
   λ = 644,0 nm nC = 1,4802 
 

 

While every attempt has been made to verify the source of the information, no responsibility is accepted for accuracy of data.

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