There's one layer of Rubber Glue on top of the Mayler or EMI. It has special Plastic performance and can be tightly stick on Keypad or PCBs.

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Special Plastic performance and tightly stick on Keypad EMI printing has been adopted on current Metal Dome switch, and the priority of EMI printing lies in controlling the impedance of printing surface below 1.0, which result in effect of prevention to Hertzian waves and electrometer, in this way, the tone can be dealt with on the surface With the infiltration of static the effect of protecting the loop happened Manufacturing engineering can be more difficult compared with the exist metal dome Strong applicability to the changeable climate ? Technical Parameter Total Height: 0.28-0.45 mm ? Travel: 0.13-0.30 mm Scope of Force: 100-400 gf Tolerance of Force: ±25 gf Click Ratio: >30% Life Cycles: >1 Million Cycles Salt and Fog Examination: v35±2°C, 5±0.1%, 48H Working Temperature: -20°C-50°C Working Humidity: Under 100%RH Touch Resistance: <1 ohm ESD Resistance: <3 ohm Dimension Tolerance: ±0.05-±0.15mm Contact us for more！