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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
  • Drastically improved mechanical strength after chemical strengthening
  • Toughened glass stays flexible
  • Produced environment friendly

Typical Applications

  • Speciality cover slips for research & science
  • Cover glass for display technology
  • Sensor glass covers
  • Advanced ultra thin glass applications
  • Glass for electronics
  • Automotive glass applications

The new aluminosilicate glass AS 87 eco has been added to the extensive delivery program of our company in 2017. It allows a wide range of special technical applications that require an ultra thin glass material. The SCHOTT glass is available at a thickness range of 50 to 350 µm at very low tolerances. A very good UV-permeability especially in the UV-B range, which is superior to that of most other ultra thin glass materials, should be emphasized. Although the transmission of ultraviolet light is not quite as high as that of quartz glass with UV-quality, such ultra thin quartz glass substrates at very low thicknesses can often not be manufactured at reasonable cost. The transmissivity of AS 87 eco at a thickness of 175 microns still reaches 80 % at 290 nm and even at 250 nm there still is a transmission of approximately 40 % available. But also in the infrared range this new glass material offers a high transmissivity of greater than 90 % in the range from 350-2700 nm at 175 µm.

AS87 eco at 0,05mm thickness, not chemically strengthened
AS 87 eco at 50 μm thickness, not chemically strengthened.

Even fragile, non-strengthened, ultra thin AS87 eco glass at 0,05 mm thickness is flexible within certain limits and thinner than a sheet of paper.

AS 87 eco ultra thin glass can be used as a high-quality, ultra thin cover slip for applications in science and research. But also the use as a display cover glass, protection glass for sensor electronics or for finger print sensors are common applications for this new ultra thin glass material. For display technology and any use that requires an increased mechanical stability, the glass can be chemically strengthened by using an ion exchange treatment. By chemical strengthening, the glass becomes more flexible and obtains a high level of bending strength, mechanical impact resistance and scratch resistance. Please send us a separate request in case you need a chemically strengthened version of glass parts made of AS 87 eco. Unless otherwise specified, all specifications and details in this data sheet are given for the untempered glass without chemical strengthening. The "eco" in the glass name means, that only environment friendly refining agents have been used for the production of this glass.

In 2017, our company has developed a new CNC-cutting technology for ultra thin glass. Using this advanced process, we can even manufacture and deliver square and rectangle parts at only 50 microns glass thickness within our 48h-Express Services.

To request AS 87 eco ultra thin glass with individual dimensions please click the button below:

Request for Quotation

48h- Express Service icon

48-h Express Service partially available

(see thickness chart below)



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


Wavelength (nm)

Refractive Index

1,5040 (±0,0015)

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



48h- Express Service icon
50 µm ± 5µm
175 µm ±10 µm

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

Following additional thicknesses of AS87 eco 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"