... harmful gases proof, acid and alkali proof, quake proof. 4. Low cost, high lifespan. The life expectancy of different types of membrane switch is ... (2-10 Oz), tactile type 170-397g (6-14 Oz) Switch stroke: flat type 0.1-0.5mm, tactile type 0.6-1.5mm ... - +85°C Humidity: 40°C, 90% -95%, 240 hours flat square electronic membrane switch