1737 Low Alkali Glass

Special Properties

• Near zero alkali content
• High thermal shock resistance
• Good flatness and surface quality
• Low thermal coefficient of expansion

Typical Applications

• Substrate for Filter or Mirror Coatings
• Thin Film Substrate for Electronic applications
• Active Matrix Flat Panel Displays (AMLCD)
• Electroluminescent Displays
• Optical Windows
• Sensor Technology

1737 glass is a near zero alkali alumino-silicate glass material, featuring a high temperature and shock resistance. 1737 glass can withstand the rigorous cycles of the newer poly-silicon transistor processes. The special properties of 1737 low alkali speciality glass, besides its strain point of 666°C, allow special manufacturing processes for various electronic components. The technical glass also is a good choice to be used as an optical substrate for filter- or mirror coatings. 1737 glass from Corning is more durable than 7059 and has an even lower level of alkali than the discontinued 7059 microsheet material. In most applications unannealed 1737F glass can even replace annealed 7059, resulting in considerable material cost savings to the user.

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Specifications of 1737 low alkali glass

 

Optical Properties

• Optical Transmission spectrum of 1737 glass
• UV-Transmission of 1737 glass
• Birefringence Constant: 333 (nm/cm)/(kg/mm²)

Refractive Index
Wavelength (nm)	Refractive Index
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

Mechanical 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 (200g/25sec)

Thermal 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 (10^7,6 dPa): 975°C
  • Annealing Point (10¹³ dPa): 721°C
  • Strain Point (10^14,5 dPa): 666°C

Electrical 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 Properties

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

Chemical Durability
Medium	5% NaOH	Na2CO3-0,02N	5% HCL
Temp. (°C)	95	95	95
Reaction Time (h)	6	6	24
Weight loss (mg/cm2)	1,76	0,17	0,46

Standard Thicknesses

• 0,5mm (+/-0,05)
• 0,7mm (+/-0,07)
• 1,1mm (+/-0,10)

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