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AS 87 eco

Ultra thin aluminosilicate glass

Special Properties

  • Ultra-thin standard thicknesses
  • Very low micro-roughness
    (typically ≤ 0,5 nm / RFA-measurement)
  • High UVB transmissivity
  • Excellent 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 spacers
  • Special cover glasses for research & science

Related glass types

  • D 263 T
    (Ultra-thin borosilicate display glass from SCHOTT)
  • AF 32® eco
    (Alkali-free alumina-borosilicate glass from SCHOTT)
  • MEMpax®
    (Thin borosilicate glass from SCHOTT)
  • 0211
    (Alkali reduced borosilicate thin glass from CORNING)
  • Selected float glass
    (Mirror-grade iron reduced soda-lime thin glass)

Request for Quotation

48h-Express Optics Also available in 48 h Express-Service

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

The UVB-transmissivity of AS 87 eco is higher than that of most other ultra-thin glass materials. At a thickness of 175 μm, the transmission typically reaches about 80% at 290 nm. Even at 250 nm, it still transmits about 40% of light. The UV transmission is not as high as that of quartz glass. However, as producing such ultra-thin quartz glass parts require great effort at a high cost, AS 87 eco aluminosilicate glass can often be a cost-effective alternative solution.

Furthermore, AS 87 glass also has an excellent optical permeability in the infrared range. At 175 μm glass thickness and wavelengths from approx. 350 to 2700 nm, the material lets pass more than 90% of IR-light.

 

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.

 

Front glasses of fingerprint sensors often base on AS 87 eco glass, and it is part of the display unit of numerous smartphones. It is ideal for ultra-thin sensor covers, optical semiconductors, coverslips for research and science, or glass spacers.

All AS 87 eco-materials allow chemical strengthening by ion exchange for applications with increased mechanical requirements. This process gives the ultrathin glass drastically increased bending, scratch, and impact resistance. Please send us a separate inquiry if you need a chemically strengthened version of AS 87 eco thin-glass. All data in this spec-sheet refers to non-strengthened glass products unless stated separately. The "eco" in the glass name means that SCHOTT only uses environment-friendly refining agents for the AS 87 glass production.

At the beginning of 2017, our company developed a new unique CNC-cutting system and the necessary process technologies to process ultra-thin glass. These technologies make it possible to process and deliver even only 50 μm thick glass within our 48-hour express service.

 

To request a quotation for ultra-thin AS 87 eco glass with your required dimensions, please choose a thickness from the table in the specifications or click the following button.

 

Request for Quotation

 

Specifications

 

Optical transmission at 175 µm glass thickness

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


Standard Thicknesses

(Please click on a glass thickness to request a quote)

Thickness (mm)

Tolerance

48h-Express Service
50 µm ± 5 µm
100 µm ± 15 µm
175 µm ± 15 µm
The thicknesses marked with "" are also available within 48–h Express Service.
The following additional thicknesses of AS87 eco glass are available on special request: 70, 145, 210, 250, 300, & 350 µm. Please send us your inquiry in case of the need for one of these thicknesses.

Optical Properties

  • Abbe number: ve = 59,5
  • Photo-elastic 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 °C ; 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 (permittivity) εr

Frequency in GHz
0,001
1,0
2,0
5,0
24
77
 
7,7
7,3
7,3
7,2
7,2
7,1

Loss Tangent tan(δ) x 10-4

Frequency in GHz
0,001
1,0
2,0
5,0
24
77
 
138
133
148
172
330
380
  • Conductivity (S/cm ; DC ; 25 °C): 5,6 x 10-12

You can find more ultra-thin glasses here:

  • D 263 T (ultra-thin display glass from SCHOTT)
  • AF 32® eco (alkali-free thin glass from SCHOTT)
  • 0211 (display thin-glass from CORNING)
  • MEMpax® (borosilicate thin-glass from SCHOTT)

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. Also, please consider our "Notes on technical specifications".

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