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AS 87 eco

Ultra thin aluminosilicate glass

Special Properties

  • Ultra-thin standard thicknesses
  • Very low micro roughness
    (typical ≤ 0,5 nm / RFA-measurement)
  • High UVB transmissivity
  • Very good infrared transmission
  • Low total thickness variation (TTV)
  • Suited for chemical strengthening

Typical Applications

  • Glass covers for sensors
  • Display-applications for smartphones
  • Fingerprint sensors
  • Thin glass spacer
  • Special cover glasses for research & science

The high quality ultra-thin alumosilicate glass AS 87 eco from SCHOTT is available in a thickness range of 50 - 350 μm at a very tight thickness tolerance.

AS 87 eco offers quite high UVB-transmissivity, which even exceeds that of most other ultra-thin glasses. The transmission at a glass thickness of 175 μm is typically about 80% at 290 nm. At 250 nm about 40 % transmitted light is still available. The UV-transmission is not as high as that of quartz glass. But such ultra-thin quartz glass parts can only be produced with great effort and at high cost so AS 87 eco often is an economical alternative solution. Furthermore, AS 87 glass also has very good optical permeability in the infrared range. At 175 μm glass thickness and at wavelengths from approx. 350 to 2700 nm, the glass lets more than 90 % of IR-light pass through.

 

AS87 eco at 0,05mm thickness, not chemically strengthened
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Even fragile, non-strengthened, ultra thin AS87 eco glass at 50 µm thickness is flexible within certain limits and thinner than a sheet of paper.

AS 87 eco at 50 μm thickness, not chemically strengthened.

 

AS 87 eco can be found, for example, in smartphones, as a cover glass for fingerprint sensors or displays. The material as well is used for ultra-thin sensor covers for optical semiconductors, cover slips for research and science, or as glass spacers.

For applications with increased mechanical requirements, AS 87 eco glass can be chemically strengthened by ion exchange. This gives the ultrathin material a drastically increased bending, scratch and impact resistance. Please send us a separate inquiry in case you need a chemically strengthened version of AS 87 eco thin-glass. All data in this data sheet refer to the non-strengthened glass, unless stated separately. The "eco" in the glass name means, that only environment friendly refining agents have been used for the production of this glass.

At the beginning of 2017, our company developed a new special CNC-cutting system and the required process technology for the processing of ultra-thin glass. Thanks to this new technology, it is now possible to process and deliver even 50 μm thick glass within our 48 hour express service.

 

To request a quotation for ultra-thin AS 87 eco glass with your individual dimensions, please click the following button:

 

Request for Quotation

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48-h Express Service partially available

 

Specifications

 

Optical Transmission (175 µm thick)

AS 87 eco transmission at 200-3200 nm

SCHOTT AS 87 glass, optical transmission at 200-3200nm

View transmittance curve at 200-3200 nm

 

AS 87 eco transmission at 200-1100 nm

SCHOTT AS 87 glass, optical transmission at 200-1100nm

View transmittance curve at 200-1100 nm

 

AS 87 eco UV-transmission at 200-400 nm

SCHOTT AS 87 glass, UV-transmission at 200-400nm

View UV-transmittance curve at 200-400 nm

 

Optical Properties

  • Abbe number: ve = 59,5
  • Photoelastic constant 29,0 (nm/cm)/MPa

Refractive index chart

Designation

Wavelength (nm)

Refractive Index

ng
436
1,5225
nF'
480
1,5104
nF
486
1,5099
ne
546
1,5061
nd
587,5
1,5041
nD
589,3
1,5040 (±0,0015)
nC'
644
1,5019
nC
656
1,5015

Mechanical Properties

  • Density: 2,46 g/cm3
  • Young's modulus E: 73,3 kN/mm2
  • Poisson's ratio μ: 0,216
  • Torsion modulus G: 30,1 kN/mm2
  • Knoop hardness (HK 0,1/20):
    • 500 (not strengthened)
    • 560 (chemically strengthened)
  • Vickers hardness (HV 0,2/25):
    • 550 (not strengthened)
    • 630 (chemically strengthened)

Thermal Properties

  • Coefficient of thermal expansion (CTE):
    8,7 x 10-6/K (20 ° ; 300 °C)
  • Viscosities:
    • Softening Point (107,6 dPa): 872 °C
    • Annealing Point (1013 dPa): 633 °C
    • Strain Point (1014,5 dPa): 594 °C
  • Transformation temperature Tg: 621 °C
  • Mean specific heat capacity (20-100 °C):
    0,84 J/(g x K)

Chemical Properties

  • Hydrolytic resistance class: HGB 2
  • Acid resistance class: S4
  • Alkali resistance class: A1

Electrical Properties

  • Dielectric constant εr (25 °C):
    • 7,7 (1 MHz)
    • 7,3 (1 GHz)
    • 7,2 (5 Ghz)
  • Dielectric Loss tangent (tan δ ; 25 °):
    • 138 x 10-4 (1 MHz)
    • 133 x 10-4 (1 GHz)
    • 172 x 10-4 (5 GHz)
  • Conductivity (S/cm ; DC ; 25 °C): 5,6  x 10-12

Available Thicknesses

Thickness

Tolerance

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50 µm ± 5µm
175 µm ±10 µm

The marked thicknesses () are available within our 48h–Express Services.

Following additional thicknesses of AS87 eco glass are available on special request: 70, 100, 145, 210, 250, 300 & 350 µm. Please send us your inquiry in case of need of one of these thicknesses.

If you are in search of further technical information, please contact us.

 

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