Optical Glass picture, AF45
 

AF45 Alkali Free Thin Glass

Modified borosilicate display glass

Special Properties

  • Alkali free in synthesis*
  • High thermal resistance (up to approx. 600°C)
  • Low thermal expansion
  • High light transmission

Typical Applications

  • CCD sensor cover glass
  • Hybrid circuit glass substrates
  • Active matrix displays AMLCD, TFT
  • Alkali free glass cover slips
  • Electroluminescent displays
  • Display technology
  • Sensor technology
  • Thin glass applications
  • Liquid crystal displays (LCD)
  • Alkali free microscope glass slides
  • Bonding applications

The unique properties of the AF45 technical sheet glass from SCHOTT and the many different available standard thicknesses, make AF 45 glass a good choice for various special display glass and thin glass applications. Because of the fire-polished surfaces, in most instances there is no need to further polish the surfaces the glass before use. AF 45 is a modified borosilicate glass with a high content of BaO and Al2O3, and is alkali-free* in synthesis. It features an excellent thermal resistance and a low coefficient of thermal expansion. The high optical transmission of AF45 in the visible range enables many different applications in optical, opto-electronical and sensor applications.


To request windows or substrates made of our AF 45 alkali free Glass with individual dimensions, please click the button below:


Request for Quotation

 

Note: The production of AF45 has been discontinued by SCHOTT a while ago. We still stock some remaining AF45 material at some thicknesses. Possible alternative near zero alkali glass materials are 1737 and EAGLE2000.

 

*Caused by marginal impurities in the raw materials and resulting from the manufacturing process an alkali content of 0,2 per cent of weight might be possible.

Specifications

 

Optical Properties

AF45, Index of Refraction

Description

Wavelength (nm)

Refractive Index

ng
436
1,5359
nF'
480
1,5318
nF
486
1,5313
ne
546
1,5275
nd
587,5
1,5255
nD
589,3
1,5254
nC'
644
1,5233
nC
656
1,5229

Mechanical Properties

  • Density: 2,72 g/cm3
  • Young's modulus E: 66,0 kN/mm2
  • Poisson's ratio μ: 0,235
  • Torsion modulus G: 26,7 kN/mm2
  • Knoop hardness HK100: 555

Thermal Properties

  • Coefficient of mean linear thermal expansion :
    4,5 x 10-6/K (20-300°C ; static measurement)
  • Viscosities:
    • Working Point (104 dPa): 1225°C
    • Softening Point (107,6 dPa): 883°C
    • Annealing Point (1013 dPa): 663°C
    • Strain Point (1014,5 dPa): 627°C
  • Transformation temperature Tg: 662°C
  • Heat conductivity (W/(m x K):
    • 0,93 (25°C)
    • 1,04 (87°C)
    • 1,10 (127°C)
    • 1,13 (166°C)

Chemical Properties

  • Hydrolytic Resistance according to DIN ISO 719:
    • Hydrolytic Class HGB 1
    • Equivalent of Alkali (Na2O) per g of glass grains:
      6,8 μg/g
  • Acid Resistance according to DIN 12 116:
    • Acid Class 4
    • Half surface weight loss after 6h:
      > 250 M.G./dm2
  • Alkali Resistance according to DIN ISO 695:
    • Alkali Class A3
    • Surface weight loss after 3h:
      460 mg/dm2

Chemical Durability

Medium

5% NaOH

N/50 Na2CO3

5% HCL

Temp (°C) 95 95 95
Reaction time 6 6 6
Weight loss
(mg/cm2)
2,2 0,11 5,2

Electrical Properties

  • Dielectric constant εr: 6,2 (1Mhz)
  • Dielectric loss tangent (tan δ): 9 x 10-4
  • Specific DC-Volume Resistivity ρD:
    • 6,0 x 1013 (250°C)
    • 3,2 x 1011 (350°C)
    • 1,6 x 109 (500°C)
  • Temperature Tk 100: 610°C
    (for volume resistivity of 10Ωcm)

Thicknesses

Thickness Tolerance Thickness Tolerance
0,050mm ±0,01 0,300mm ±0,02
0,100mm ±0,01 0,400mm ±0,02
0,145mm* ±0,02 0,500mm ±0,05
0,175mm* ±0,02 0,700mm* ±0,05
0,200mm ±0,02
*These thicknesses are not always available.
Please send us your inquiry to check for availability.

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