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Characteristics of AF 45™ thin glass

AF 45™ is an alkali free borosilicate with a high proportion of BaO and Al2O3.
Alkali-free raw materials are used for the synthesis of AF 45™.

Characteristics:

Outstanding:

  • Alkali-free with regard to raw materials used
  • Low coefficent of thermal expansion
  • Excellent thermal resistance
  • High light transmission
  • Excellent surface quality
Dimensions
  • Max: 440 mm x 360 mm (size on request)
  • Thicknesses: 0.05 mm to 0.5 mm (special thicknesses on request)
  • Option to supply dimensions, processing and tolerances according to customer specifications.
  • Rectangular formats in all thicknesses; round / wafer formats 0.1 mm and above
nominal thickness





[mm]
thickness
tolerancey

variation within the lot
(from sheet to sheet)

[mm]
thickness variation
within the sheet

referenced to net width
of 360 mm

[µm]
0.05
± 0.010
≤ 10
0.10
± 0.015
≤ 20
0.145
± 0.015
≤ 20
0.20
± 0.020
≤ 20
0.30
± 0.020
≤ 20
0.40
± 0.020
≤ 20
0.50
± 0.050
≤ 30


Edge processing:
  • Ground to C-shape or chamfered
  • Conventional or laser cut edge
  • Orientation corner


The following characteristics are based largely on the measurement results of the latest standards and measuring procedures. The specified characteristics refer in part to one time measurements and are not continually monitored. SCHOTT reserves the right to update the data to the latest technology.

Thermal characteristics
Viscosity and temperatures
Description Viscosity
log η [dPas]		 Temperature
() [°C]
Strain point 14.5 627
Annealing point 13.0 663
Softening point 7.6 883
Transformation temperature Tg in °C 662
Expansion factor α
Coefficient of thermal expansion α(20-300°C) in 10 -6 K -1 (static measurement) 4.5


Mechanical characteristics
Density ρ in g/cm3 2.72
Stress optical coefficient C in 1.02 · 10-12 m2/N 3.2
Young's Modulus E in kN/mm2 66.0
Poisson number µ 0.235
Modulus of torsional shear G in kN/mm2 26.7
Knoop hardness HK100 555


Chemical characteristics
Hydrolytic resistance according to DIN ISO 719
Hydrolytic classification HGB 1
Base equivalent per g glass grains in µg/g 6.8
Acid resistance according to DIN 12116
Acidity classification 4
50% surface loss after 6 h in mg/dm2 > 250
Alkali resistance according to DIN ISO 695
Classification A 3
Surface loss after 3 hours in mg/dm2 460


Electrical characteristics

Dielectricity constants εr at 1 MHz 6.2
Dielectrical loss factor tan δ at 1 MHz 9 · 10-4
Electrical volume resistance ρD in Ω · cm at specified temperature ρD for direct current
T = 250 °C 6.0 · 10 13
T = 350 °C 3.2 • 101
T = 500°C 1.6 · 109
Temperature tk100 in °C for the specific electrical volume resistance
108 Ω · cm		 610


Optical characteristics
Refractive indices
Pre-processing of samples ng 1.5359
"as drawn" nF“ 1.5318
nF 1.5313
ne 1.5275
nd 1.5255
nD 1.5254
nC“ 1.5233
nC 1.5229
Abbe number νe 62.2


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Contact

SCHOTT North America, Inc.
Corporate Office

555 Taxter Road
Elmsford, NY 10523
USA
 +1 (914)831-2200
 +1 (914)831-2201
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