AF37
Alkali & Arsenic Free Glass
Special Properties
- Alkali & arsenic free in synthesis*
- Low sagging
- Low density glass
- High chemical and thermal resistivity
- Low thermal expansion
- Low shrinkage
Typical Applications
- Active-Matrix LCD-Displays (AMLCD glass)
- Common display glass applications
- Electroluminescent displays
- Special arsenic free microscope slides
- Low alkali glass wafers
- Semiconductor applications
The new alkaline-earth aluminosilicate glass AF37 is characterized by a number of exceptional physical and chemical properties. The speciality glass from Schott is alkali and arsenic free in synthesis, and has a high chemical durability. AF37 offers a high heat resistivity, resulting from the low coefficient of thermal expansion. It features a low shrinkage which is of great importance to many electronics and display applications. AF37 thin glass material is made by using advanced float glass technology. It profits from all advantages of this manufacturing process. Therefore even the natural surfaces of AF 37 show a good flatness and low micro roughness. Often the material can be utilized without an additional mechanical polishing step required, resulting in significant cost savings to the user. AF37 glass has a low thickness tolerance, a good TTV (total thickness variation) and is available even at large dimensions. As a result of its low density, AF37 is relatively light weight, which is an important advantage exceedingly in display applications.
To request windows or substrates made of AF 37 Arsenic Free Glass with your individual dimensions, please click the button below:
The production of AF37 has been discontinued. Therefore large material quantities cannot be quoted anymore. We still have some stock for smaller orders available.
Specifications of
AF37 alkali & arsenic free glass
Optical Properties
- Show transmission spectrum of AF37
- UV-Transmission of AF37
- Birefringence constant:
3,18 x 10-6 mm2/N (588nm ; 21C°) - nd = 1,52 (587nm)
Mechanical properties
- Density: 2,48 g/cm3
- Young's Modulus: 78 kN/mm2
- Poisson Ratio: 0,24
- Vickers Hardness: 640 (2N/25sec)
Thermal Properties
- Coefficient of thermal expansion:
3,77 x 10-6/ °C (20-300°C) - Shrinkage:
≤ 5 ppm (Hold 1h at 400°C, ramping 2,5°C/min) - Transformation temperature Tg: 711°C
- Viscosities:
- Strain point (1014,5 dPa): 684°C
- Annealing point (1013 dPa): 722°C
- Softening point (107,6 dPa): 942°C
- Working point (104 dPa): 1263°C
- Heat conductivity: 1,12 W/mK (90°C)
- Mean specific heat capacity: 0,78 kJ/kgK (20-100°C)
Electrical Properties
- Dielectric constant: 5,5 (1Mhz ; 25°C)
- Loss tangent: 0,19% (1Mhz ; 25°C)
- Volume resistivity:
- 1012,4 Ωcm (250°C)
- 1010,7 Ωcm (350°C)
- Temperature Tk 100: 627°C
(for volume resistivity of 108 Ωcm)
Chemical Durability |
||||
|---|---|---|---|---|
| Medium | 5% NaOH 1,3mol/l |
10% NH4F:HF 1,8mol/l |
5% HCL 1,4mol/l |
Dl H20 |
| Temp (°C) | 95 | 23 | 95 | 95 |
| Reaction time | 6h | 20min. | 24h | 24h |
| Weight loss (mg/cm2) |
1,3 | 0,68 | 0,44 | <0,01 |
Nominal standard thickness
- 0,7mm (+/-0,07)
All given details and specifications are mean reference values and are not guaranteed. In addition, please consider our "Notes on technical specifications"