Glass-Film-Glass (GFG)

In addition to resisitve touch screens with a film surface, AMT has also successfully developed touch screens that utilize a top layer of thin glass or heavy duty material which AMT has designated as a GFG (Glass-Film-Glass) touch screen. The surface of a GFG panel is even more resistant to scratches, high temperatures, and is easier to clean.


There are two GFG touch screen structures, one employs 0.2mm thin glass on top of the resistive touch screen and the other uses a HD (heavy duty) film laminate. Both materials, thin glass and HD film, feature anti-scratch properties. When applying thin glass with a clear surface finish, hardness will reach 5 Mohs and when using HD film, whether a clear or AG surface finish, hardness will be higher than 9H. GFG touch surface coatings include clear surface and Anti-Glare finishes. GFG touch screens are not only resistant to scratches and abrasion but also most chemicals, making GFG touch screens appropriate for the following purposes:

  • Industrial Applications
  • Medical Equipment
  • Equipment for the Food Industry
  • Adverse and severe working conditions such as in gas stations or chemical plants
  • Various marine, transportation, or air transportation operating systems

If the GFG panel is to be mounted onto equipment for outdoor use, it is also customizable with a low-reflection coating.


  • Sizes:
    • 3” to 19”(0.2mm thin glass)
    • 3.5″ to 10.9″ (HD film)
  • Corrosion and scratch resistance, suitable for chemical-laden environments, easily-cleaned surface
  • Customizable Surface Finish: Clear or Anti-glare surface
  • Average Activation Force: 0.5N ~ 1.5N
  • Surface Hardness:
    • for clear type thin glass: > Mohs 5
    • for AG type thin glass: 7H
    • for clear or AG type HD film: 9H
  • Light transmission rate: Over 80%
  • Operating temperature: -30 ~ 80˚C
  • Storage temperature: -40 ~ 90˚C
  • Linearity: Under 1.5%


  • Standard GFG Structure


  • Low Reflective GFG Structure


Almost all of AMT’s standard products can be customized with a GFG structure. Please contact our sales staff for customization.


  • Surface finish: Clear or Antiglare
  • Light transmission: > 80%
  • Sizes:
    • 3” to 19”(0.2mm thin glass )
    • 3.5″ to 10.9″(HD film)
  • ITO glass thickness: 0.7mm ~ 2.8mm
  • Tail design: FPC type, Integral tail or others
  • Tail terminator: ZIF, Berg, AMP, AMP compatible or others
  • Input method: finger, gloved, stylus
  • Activation force:
    • 1.5N(maximum) for touch inner area
    • 2.5N(maximum) for touch perimeter area
  • Surface hardness:
    • For clear type thin glass: > Mohs 5
    • For AG type thin glass: 7H
    • For clear or AG type HD film: 9H
  • Operating temperature: -30℃ to +80℃
  • Storage temperature: -30℃ to +90℃
  • Operating humidity:
    • if temp. ≧ 40°C, humidity less than 80% RH
    • if temp. < 40°C, humidity less than 90% RH
    • No dew condensation
  • Storage humidity: ambient humidity
  • Insulation resistance: 10M ohm@25V DC
  • Linearity:
    • < 1.5% for 4-, 8-wire touch
    • < 1.0% for 5-wire touch inner area
    • < 1.5% for 5-wire touch perimeter area
  • Contact bounce:
    • < 10ms for 4-, 8-wire touch
    • < 15ms for 5-wire touch
  • Operating voltage: 5.5 V
  • Contact current: 70mA (maximum)

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