Membrane Materials Usage Guide for Membrane Switches & Capacitive Touch Switches

Graphic Overlay Film Materials:

PET (Polyester)

  • Brands: Autotex, Toyobo, Toray, Mitsubishi, etc.
  • Typical Thickness: 0.188mm, 0.125mm
  • UV resistance treatment required for outdoor applications
  • Suitable for antibacterial treatment
  • Additional treatments available: brushed and anti-glare
  • Enhanced surface hardness for scratch resistance

PC (Polycarbonate)

  • Brands: Sumitomo, Bayer, GE, etc.
  • Thickness: 0.175mm, 0.25mm
  • More scratch-resistant than PET
  • Enhances the product’s texture
  • Higher price range

PET film is commonly used for its versatility and durability, making it an excellent choice for various applications, including outdoor environments where UV resistance is crucial. PC film, on the other hand, offers a premium feel and enhanced scratch resistance but comes at a higher cost.

Capacitive Touch Switch Graphic Overlay Materials:


  • High transparency
  • Economical pricing
  • Limited heat resistance


  • High transparency
  • Enhances product texture and durability
  • Higher cost

Acrylic offers a cost-effective solution with excellent transparency, though it has limited resistance to high temperatures. Glass provides superior durability and a high-quality feel but is more expensive.

Circuit Film Materials:

PET Film

  • Brands: Sichuan Dongfang, Toyobo, Mitsubishi, Toray, etc.
  • Insulation Capability: Greater than 10^12 ohms
  • Common Thickness: 0.125mm, 0.1mm
  • Requires surface treatment for ink adhesion

PET film used for circuit layers is selected for its high insulation properties, ensuring reliable performance in electronic applications. Surface treatment is necessary to ensure consistent ink adhesion during the printing process.

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