AF 45

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 and TFT
• Alkali-free glass coverslips
• Electroluminescence displays
• Display technology
• Sensor technology
• Thin glass applications
• Liquid crystal displays (LCD)
• Alkali-free microscope glass slides

Related glass types

• Alkali-free glasses:
• EAGLE²⁰⁰⁰ (boro-aluminosilicate glass)
• 1737F (boro-aluminosilicate glass)
• AF 32^® eco (alkali-free alumina-borosilicate thin glass)
• 7059 / 7059F (low alkali barium-borosilicate glass)
• Display and thin glasses:
• D 263 T (thin and ultrathin borosilicate display glass)

Request for Quotation

Partially available in 48-hour express service

AF 45 thin glass from SCHOTT is modified borosilicate glass with a high content of BaO and Al2O3. It is alkali-free* in synthesis. Due to the unique properties of AF 45, this sheet glass is an excellent choice for many specialty display glass applications. Because of the high-quality fire-polished surfaces of AF 45, there is no need to polish the glass surfaces before use in most instances.

The glass features exquisite thermal resistance and a low coefficient of thermal expansion. Its high transmission in the visible wavelength range enables many optical applications in optoelectronics and sensor technology.

To request a quote for windows or substrates made of AF 45 alkali-free glass with specific dimensions, please choose a thickness from the table in the specifications or click the button below.

 

Request for Quotation

 

Important note: SCHOTT discontinued the production of AF 45 glass a long time ago. We still stock some remaining AF 45 material at 0.7 mm thicknesses. Possible alternative near-zero alkali glass materials at 0.7 mm and 1.1 mm are 1737F and EAGLE2000. For all thicknesses below 0.7 mm, AF 32_^® eco is a perfect alternative product to AF45.

 

*Caused by marginal impurities in the raw materials and resulting from the manufacturing process, an alkali content of 0.2 percent of weight might be possible in AF 45.

 

Specifications

Standard Thicknesses

Please click on a glass thickness to request a quote:

Thickness (mm)	Tolerance
0.050*	±0.010	-
0.100*	±0.010	-
0.145*	±0.020	-
0.175*	±0.020	-
0.200*	±0.020	-
0.300*	±0.020	-
0.400*	±0.020	-
0.500*	±0.050	-
0.700	±0.050	✔
The thicknesses marked with "✔" are also available within 48–hour express service.
*These thicknesses are not available anymore. Please send us your inquiry to check for alternatives.

Optical Properties

• Display the optical Transmission spectrum of AF45
• UV-Transmission of AF45
• Abbe number: v_e = 62.2

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 × 10^-6/K (20-300 °C ; static measurement)
• Viscosities:
  • Working Point (10⁴ dPa): 1225 °C
  • Softening Point (10^7.6 dPa): 883 °C
  • Annealing Point (10¹³ dPa): 663 °C
  • Strain Point (10^14.5 dPa): 627 °C
• Transformation temperature Tg: 662 °C
• Heat conductivity (W/(m × 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 ε_r: 6.2 (1 MHz)
• Dielectric loss tangent (tan δ): 9 x 10^-4
• Specific DC-Volume Resistivity ρ_D:
  • 6.0 × 10¹³ (250 °C)
  • 3.2 × 10¹¹ (350 °C)
  • 1.6 × 10⁹ (500 °C)
• Temperature Tk 100: 610 °C
  (for volume resistivity of 10⁸ Ωcm)

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

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Last update: May 21, 2024