... Insulation resistance:> 100MΩ 250V DC Contact bounce: ≤ 5ms Dielectric withstand:250VRms (50-60Hz 1min) Life expectancy: flat type ≥ 10 ... million times, tactile type: ≥ 1 million times 2. Memchanical Properties ... weight, thin thickness, good tactility,abrasion resistant,installation and connection convenience. 3T.ightness is good, moisture-proof, dust ...