Borosilicate glass Suprax 8488
Characteristics of the borosilicate glass SUPRAX 8488 
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| 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)
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 |
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 |