Optical Glass picture, 1737
 
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1737F

Alkali-free boro-aluminosilicate glass

Special Properties

  • Alkali content close to zero
    (alkali content ≤ 0,1 % , typical < 0,06 %)
  • High thermal shock resistance
  • Good flatness and surface quality
  • Low thermal coefficient of expansion

Typical Applications

  • Substrate glass for filter or mirror coatings
  • "Chip on glass" substrates (COG)
  • Thin film glass substrates for electronic applications
  • Active matrix flat panel displays (AMLCD)
  • Electroluminescent display glass
  • Optical windows
  • Optics for sensor technology
  • Optoelectronics

1737F alkaline earth boro-aluminosilicate glass has a high temperature and shock resistance. The near zero alkali glass, developed by CORNING, withstands the rigorous cycles of poly-silicon transistor processes. A low alkali content in the glass and its strain point of 666 °C, allow special manufacturing processes required for various electronic components that are not possible with most other glass materials. A coefficient of thermal expansion closely matching to silicon opens up the option for chip-on-glass (COG) applications. Furthermore, 1737F features an exceptionally low micro roughness and a very good optical quality. In general the natural surfaces of 1737F glass have a lower micro roughness than most mechanically polished glasses can provide. The glass is an excellent choice for optical filter- or mirror coating substrates. Corning 1737 glass is more durable than its predecessor 7059 and has an even lower level of alkali and of shrinkage. In most applications un-annealed 1737 F LCD-glass can even replace annealed 7059 glass, resulting in considerable cost savings. An alternative near zero alkali glass to 1737 is CORNING's EAGLE2000.

 

To request windows or substrates made of 1737 low alkali glass with individual dimensions, please click on the button below:

 

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Specifications

 

Transmission

Optical Transmission 1737 low alkali glass

Optical transmission spectrum of 1737 glass

 

UV-Transmission at 0,7 mm thickness

UV-Transmission of 1737 low alkali glass

UV-Transmission of 1737 glass

 

Optical Properties

  • Birefringence Constant: 333 (nm/cm)/(kg/mm2)

Wavelength (nm)

Refractive Index

Mechanical Properties

435,8 1,5287
480,0 1,5247
486,1 1,5244
546,1 1,5203
589,3 1,5183
643,8 1,5161
656,3 1,5160
1300 1,5051
1541 1,5023

Thermal Properties

  • Density: 2,54 g/cm3 (20 °C)
  • Young's modulus: 70,9 GPa
  • Poisson's ratio: 0,23
  • Shear modulus: 28,9 GPa
  • Vickers hardness: 633 (200 g / 25 sec)

Electrical Properties

  • Coefficient of thermal expansion
    • 37,6 x 10-7/ °C (0-300 °C)
    • 42,0 x 10-7/ °C (20-671 °C)
  • Viscosities:
    • Working Point (104 dPa): 1312 °C
    • Softening Point (107,6 dPa): 975 °C
    • Annealing Point (1013 dPa): 721 °C
    • Strain Point (1014,5 dPa): 666 °C

Chemical Properties

  • Dielectric Constant 5,7 (20 °C ; 1 kHz)
  • Volume Resistivity (Log10):
    • 13,5 (250 °C)
    • 11,4 (350 °C)
    • 9,3 (500 °C)

Chemical Durability

  • Alkali Content: approximately 0,1 wt. % (typ. < 0,05 %)

Medium

5% NaOH

Na2CO3-0,02N

5% HCL

Standard Thicknesses

Temp. (°C) 95 95 95
Reaction Time (h) 6 6 24
Weight loss
(mg/cm2)
1,76 0,17 0,46

Standard Thicknesses
(click on desired thickness for price quote)


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