Conductive black particles. These conductive black particles are the most common and most common, found on many buttons. They are usually round with a grid pattern and have a resistance of around 100Ω. The shape can also be customized, requiring an additional black die for punching.
Conductive ink. With conductive materials (gold, silver, copper and carbon) dispersed in the binder made of paste ink, has a certain degree of conductive properties, when the ink drying is poor, resistance value will increase, so also need to bake under infrared.
Gold-plated grains. Conventional conductive black particles have a resistance of around 100Ω, while gold-plated particles can keep the resistance within 1Ω. The lower the resistance value, the higher the sensitivity of the key, therefore, gold plated particles are often used on the silicone button with higher sensitivity requirements. Such as military keys, car keys, instrument silicone keys and so on.....
