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AF37

Alkali- & arsenic free aluminosilicate glass

Special Properties

  • Alkali & arsenic free in synthesis
  • Low sagging
  • Low density glass
  • High chemical and thermal resistance
  • Low thermal expansion
  • Low shrinkage

Typical Applications

  • Active-Matrix LCD-Displays (AMLCD glass)
  • Display glass applications
  • Electroluminescent displays
  • Arsenic free microscope slides
  • Alkali free glass wafers
  • Semiconductor applications

The alkaline-earth aluminosilicate glass AF37 is characterized numerous exceptional physical and chemical properties. The speciality glass from SCHOTT is alkali and arsenic free in synthesis, and has a high chemical durability. Resulting from the low coefficient of thermal expansion, AF37 glass offers a high heat resistivity. It features a low shrinkage which is of great importance to many electronics and display applications. The thin glass material is made by using advanced float glass technology. It profits from all advantages of this manufacturing process. Therefore, the natural surfaces of AF 37 already show a good flatness and low micro roughness. Often the material can be utilized without an additional mechanical polishing step, 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 lightweight, which is an important advantage exceedingly in display applications. For further information, please contact us.


To request windows or substrates made of our AF 37 Arsenic Free Glass with individual size, please click the button below:



The production of AF37 has been discontinued by SCHOTT. Therefore, large material quantities cannot be quoted anymore. We still have some stock for smaller orders available.


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Specifications

 

Optical Properties

Mechanical properties

  • Density: 2,48 g/cm3
  • Young's Modulus: 78 kN/mm2
  • Poisson Ratio: 0,24
  • Vickers Hardness: 640 (2 N / 25 sec)

Thermal Properties

  • Coefficient of thermal expansion:
    3,77 x 10-6/ °C (20-300 °C)
  • Shrinkage:
    ≤ 5 ppm (Hold 1 h 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 (1 Mhz ; 25 °C)
  • Loss tangent: 0,19 % (1 Mhz ; 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
1,3 mol/l		 10 %
NH4F:HF
1,8 mol/l		 5 %
HCL
1,4 mol/l

Dl H20
Temp (°C) 95 23 95 95
Reaction time 6 h 20 min 24 h 24 h
Weight loss
(mg/cm2)		 1,3 0,68 0,44 < 0,01 

Nominal standard thickness

  • 0,7 mm (+/-0,07)

All given details and specifications are mean reference values and are not guaranteed. In addition, please consider our "Notes on technical specifications"