silicone rubber keypads:

silicone rubber keypads are manufactured from elastic, nontoxic silicone rubber membrane switches compounds and are processed from compression or injection molding. The result is an economical and reliable keypad for small, medium and large production runs. silicone rubber membrane switches can be integrated with printed circuit boards or flexible circuits and have excellent resistance to temperature and aging.Uniontech can also integrate your silicone rubber keypads solution with a graphic overlay, printed circuit board (PCB), membrane switch to allow additional flexibility in your design.
BASE MATERIAL:The natural color of raw silicone rubber membrane switches material is translucent white. silicone rubber membrane switches materials are blended with silicone-based color pigments to obtain the color required. Phosphorescent materials can be blended with the base rubber to create a “glow-in-the-dark” effect.Durometer is one of several ways to indicate the hardness of a material. It defines the material’s resistance to permanent indentation. It is named for instrument maker AlbertF.Shore, who developed a measurement device called a durometer in the 1920s. The term durometer is often used to refer to the measurement, as well as the instrument itself. Durometer is typically used as a measure of hardness in polymers, elastomers and rubbers.Suggested hardness for silicone rubber keypads is 40 to 60 Shore A depending on your requirements for actuation force, tactile response and life. Higher hardness silicone rubber membrane switches offer higher actuation force and snap ratio but shorter life. Lower hardness silicone rubber keypads have lower actuation force and snap ratio but longer life. silicone rubber keypads is available in flame classifications of UL94HB and UL94V0. The flame classification of most silicone rubber membrane switches used for keypads is UL94HB.