Choosing the Best Materials for a Membrane Switch Design

Designing a membrane switch can be a daunting task at times especially when it comes to choosing the best materials for your membrane switch design. There are many different  materials to consider when designing the keypad. Below you will find some of the standard materials and components CSI typically uses in our membrane switch designs.

Polyester

 
  • The material of choice for membrane keypad overlays due to its superior flex life and chemical resistance
  • Most common thicknesses are .006”, .007”, .008” and .010”
  • Certain films are suitable for outdoor use with UV inhibitors for resistance to the UV effects of sunlight.
  • Available with built-in Microban antimicrobial protection that inhibits growth of bacterial, mold & mildew.
  • Also available in brushed finish to simulate the look of brushed metal
  • Special “soft touch” surface finish available to mimic the feel of silicone rubber
 

Polyester Products

Polycarbonate

 

  • Ideal for standalone display windows, overlays without keypads as well as bezel overlays for rubber keypads
  • Available in textured, antiglare and glossy finishes
  • Certain films are suitable for outdoor use with UV inhibitors for resistance to the UV effects of sunlight.
  • Available in an anti-fog coating
  • Available in thickness ranges from .005” to .030”
 

Polycarbonate Products

Adhesives

 

3M 200MP High Performance Adhesives

  • Suitable for high surface energy materials such as aluminum, steel, polycarbonate, ABS, nylon, etc.
  • Widely used in the membrane switch applications
  • Available in thicknesses of .002” and .005”. For adhesion to textured surfaces the .005” thickness is recommended.
  • Service temperature range of -31°F to +300°F for prolonged periods and +400°F for short periods.
  • Excellent environmental, temperature, chemical and humidity resistance
 

3M 300LSE High Strength Adhesives

  • Ideal for adhesion to low surface energy plastics such as powder coated paint and polypropylene
  • Available I nthicknesses of .002”, .0035”, and .005”. For adhesion to textured surfaces the .005” thickness is recommended.
  • Service temperature range of -40°F to +200°F for prolonged periods and +300°F for short periods.
  • Excellent environmental, temperature, chemical and humidity resistance.

Membrane Switch Components

 

Connector Pins

 

Connector Housings (used in conjunction with Pins)

 

Metal Domes

 

LEDs

 

Support Panel Fasteners

 

Fiber Optic Lamps

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