Sprache: DeutschSprache: Englisch

Borosilicate glass Suprax 8488

Characteristics of the borosilicate glass SUPRAX 8488                

Thermal extension:   20/300 = 4,3.10-6 /K
Transformation temperature:   540°C
Density:   2,31 g/cm³
Modulus of elasticity:   67000 N/mm²
Poisson's ratio m:   0,20
Specific thermal stress w =   0,36 N mm-² K-1
Thermal conductivity at 90°C:   1,20 W m-1 K-1
tk100 (DIN 52326):   200°C
Logarithm of the electrical volume resistance in -cm
at 250°C   7,1
at 350°C   5,8
Dielectrical properties for 1 MHz at 25°C
DZ    5,4
tan (10-4):  96
Refractive index nd (=587,6 nm):   1,484
Stress-optical constant:   3,2.10-6
Chemical resistance
Resistance to water (ISO 719):Hydrolytic class 1
Resistance to acid (DIN 12116): Acid class 1
Resistance to alkali (DIN ISO695):Alkali class 2

    Transmittance

     

    Comparison of various attacks to borosilicate and sodalime glass

    Chemical studies showed that borosilicate glass is ten times less subject to erosion than
    soda-lime glass, at a low pH value (pure water) as well as at an increased pH value (10).
    The divergence is considerable and starts already at 134°C. To illustrate this, the figure
    shows the erosion at a temperature of 150°C.

    [from „VGB Kraftwerkstechnik”, Dr. A. Peters, Feb. 1979]

    Abb. Erosion of borosilicate and sodalime glass in the liquid phase at 150°C.
    Water exchanged pH 6 and pH 10.
    (Suprax 8488 is a registered trade mark of the Schott group)

    To top

    AR-Glass

    Characteristics of AR-Glass®

    AR-Glass® is a transparent glass that achieves water resistance class 3. It is a sodalime glass
    with a high proportion of alkali metal oxides and alkaline earth metal oxides.

    Thermal extension:   20/300 = 9,1.10-6 /K
    Transformation temperature:   525°C
    Density:   2,50 g/cm³
    Modulus of elasticity:   73000 N/mm²
    Poisson's ratio m:   0,22
    Thermal conductivity at 90°C:   1,1 W m-1 K-1
    tk100 (nach DIN 52326):   200°C
    Logarithm of the electrical volume resistance in in -cm
    at 250°C   7,1
    at 350°C   5,7
    Dielectrical properties for 1 MHz at 25°C
    DZ    7,2
    tan (10-4):   70
    Refractive index nd (=587,6 nm):   1,514
    Stress-optical constant:   2,7  10-6 N-1
    Chemical Resistance
    Resistance to water (ISO 719):Hydrolytic class 3
    Resistance to acid (DIN ISO 12116):Acid class 1
    Resistance to alkali (DIN ISO 695):Alkali class 2

      B270

      Characteristics of B 270 Superwite®

      (B270 Superwite® is a registered trademark of the Deutsche Spezialglas AG).

      B 270 Superwite® is a colorless and highly transparent crown glass,
      melted from completely clean raw materials.

      This type of glass has a particularly high transmittance in the visible wavelength, IR and UV range.
      B 270 meets the requirements of the US-FDA (Food and Drug Administration) concerning food contact
      substances (FCS). It also meets the requirements of the US Pharmacopeia for "parenteral use"
      (glass type III).

      Thermal extension:   20/300 = 9,4.10-6 /K
      Transformation temperature:   533°C
      Density:   2,55 g/cm³
      Modulus of elasticity:   71500 N/mm²
      Poisson's ratio m:   0,219
      Refractive index nd ( = 587,6 nm):   1,5251
      Chemical resistance
      Resistance to water (DIN ISO 719):HGB 3
      hydrolytic class 1
      Resistance to acid DIN 12116)acid class S2
      Resistance to alkali (DIN ISO 695)alkali class A2

      To top

      Quartz glass

      Characteristics of quartz glass                                                                     

      Quartz glass is a one-component glass (SiO2). It is one of the most valuable materials for both science
      and industry. There is a distinction between synthetic and natural quartz glass. Synthetic quartz glass
      is made from pure silicon tetrachloride (SiCl4) following the Flammpyrolyse-method. The raw material
      of quartz glass is a natural crystal mined from the earth as rock crystal or pegmatite quartz.
      The raw material is pulverized to a fine-particle granulate and melted to quartz glass in an oxy-hydrogen flame.

      Quartz glass features

      • good transmission behavior in ultra-violet, visible and infrared wavelengths
      • high temperature endurance
      • a low coefficient of thermal expansion
      • good thermal shock resistance
      • excellent electrical insulation
      • high chemical purity
      • a maximum operating temperature of 1100°C (permanently), or 1300°C (short-time)

      Applications

      • high-temperature processes (high temperature resistance)
      • semiconductor- and light-industry (purity)
      • optics (good light transmission in visible, UV and IF wavelengths)
      • laser technology
      • electronics and electro-technology (low conductivity, high penetration field strength, low dielectric loss factor)
      • chemistry and pharmaceutics (chemical resistance, not hygroscopic, chemical purity, thermal shock resistance)
      Thermal extension:   20/300 = 5,1×10-7 K-1
      Density:   2,2 g/cm³
      Modulus of elasticity:   70000 N/mm²
      Poisson's ratio m:   0,17
      Compressive strength:   1150 N/mm²
      Tensile strength:   50 N/mm²
      Bending strength:   67 N/mm²
      Thermal conductivity:   (20-100°C) 1,38-1,46 W m-1 K-1
      Logarithm of the electrical volume resistance in -cm
      at    20°C   20
      at  100°C   18
      at  600°C   12
      at 1000°C     8
      Dielectrical properties for 1 MHz at 25°C
      DZ    3,7
      Refractive index nd (=587,6 nm):   1,459
      Stress-optical constant:   3,57×10-6 N -1
      Chemical resistance
      Resistance to water (DIN ISO 719):HGB 1 Hydrolytic class 1
      Resistance to acid (DIN 12116):  class 1
      Resistance to alkali (DIN ISO 695):class 1

      To top