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This is ametal dome tactile membraneswitch( For electronic equipment ). 1.Overlay Materials:The most commonly used base materials are polyester(PET) and polycarbonate(PC). 2.Rear Adhesive:3M467MP,.Rear Adhesive 3M468MP,etc. 3.Matching color:Pantone and RALcolor matching system. 4.Gloss,semi-gloss or matte 5.metal dometactile 6.Standard Tolerances:+/- 0.10inch(+/-0.25mm) 7.Performance A.Electric Parameter resistance: <1Ω/cm contact current: 25 100mA voltage rating: 2 24V voltage insulation:1500V voltage endurance:250V(60Hz/min) insulation resistance:500VDC\500MΩ B.Physical Parameter active force: 0.3 3N lifecycle : >1mil.(non-tactile) hand speed: ≤5ms temperature: -40 +70 humidity : 40,48h95% work altitude:0-4500M C.Travel Distance non-tactile :0.1 0.3mm tactile :0.4 1.0mm Nanjing Zhongshan Membrane Switch Co., Ltd. passed ISO9001: 2000 Quality System Certification Good product + good service = Nanjing Zhongshan Membrane Switch Co., Ltd.