AF45 Alkali Free Thin Glass

Special Properties

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

Typical Applications

• CCD Covers
• Hybrid Circuit Substrates
• Active Matrix Displays AMLCD, TFT
• Alkali free glass cover slips
• Electroluminescent Displays
• Display Technology
• Sensor Technology
• Thin Glass Applications
• Alkali free microscope slides
• Bonding Applications

The unique properties of the AF45 technical sheet glass and the many different available standard thicknesses, make AF 45 glass from Schott a good choice for various special display glass and thin glass applications. Because of the fire-polished surfaces of AF45, in most instances there is no need to further polish the surfaces of AF 45 glass before use. AF 45 is a modified borosilicate glass with a high content of BaO and Al2O3, and is alkali-free* in synthesis. AF45 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, optoelectronical and sensor applications.

To request windows or substrates made of AF 45 Alkali Free Glass with your individual dimensions, please click the button below:

 

*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 of
AF45 Zero Alkali Thin Glass

 

Optical Properties

• 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 x 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 x K):
  • 0,93 (25°C)
  • 1,04 (87°C)
  • 1,10 (127°C)
  • 1,13 (166°C)

Chemical Properties

• Hydrolytic Resistance acc. to DIN ISO 719:
  • Hydrolytic Class HGB 1
  • Equivalent of Alkali (Na₂O) per g of glass grains:
    6,8 μg/g
• Acid Resistance acc. to DIN 12 116:
  • Acid Class 4
  • Half surface weight loss after 6h:
    > 250 mg/dm²
• Alkali Resistance acc. 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 (1Mhz)
• Dielectric loss tangent (tan δ): 9 x 10^–4
• Specific DC-Volume Resistivity ρ_D:
  • 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 10⁸ Ωcm)

Thicknesses
Thickness	Tol.	Thickness	Tol.
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"