PET/PC is usually the material of choice due to its fantastic chemical resistance and flex property . UNIGREAT can do digital printing, screen-printing, or apply both methods to ensure you get the right colors, textures and finish your design requirements.
This adhesive layer stick the graphic overlay to the top circuit layer, and is usually an acrylic adhesive. The material is same with the fourth layer. Only the thickness maybe different according to the actual situation.
Top Circuit Layer
The material of this layer is specific. Is is a 0.1mm thickness thermostable PET film printed with conductive silver ink and also dielectric oil, which used for fastening metal domes.
This layer separates the top circuit from the bottom circuit so that switch remains normally break until the keypad is pressed. The circuit spacer is a polyester spacer with adhesive on both sides.
Lower Circuit Layer
This layer is a 0.1mm--0.25mm thickness thermostable PET film printed with conductive silver ink and also dielectric oil. This layer terminates as a flexible tail that serves as an interconnector to controller PCBs or other IC.
This adhesive layer bonds the entire membrane switch to the product surface, housing, or to a rigid support panel. UNIGREAT can use the proper adhesive type and thickness to bond your membrane switch to your equipment.
≤ 50V DC
≥ 100MΩ (250V DC)
10Ω ~ 2kΩ (based on the design)
0.5 ~ 5Ω
Wire Lead Resistance
Base Material Voltage Withstand
Flat type ≥ 5 million times, Tactile type ≥ 1 million times
Flat Type 57-284g, Tactile Type 170-397g
Dome Rebound Time
Tail Bending Performance
Flat 0.1~0.5mm, Tactile 0.6~1.5mm
20G' s max
-40°C to +80°C (-40°C to 176°F)
-40°C to +85°C (-40°C to 185°F)
86 ~ 106 kPa
+40°C, 90% ~ 95% RH for 240 Hours
Membrane switch because of its fantastic Electrical Properties, Mechanical Properties and Environmental Properties, it is widely used in Smart Home Appliances, Office Equipment, Medical Equipment, Automobile and Industrial Equipment.
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