Rubber Key overview of silicon rubber keypads
 Material rubber
 
Silicone rubber, silicone rubber or poly (Silicone Rubber), which is a molecular chain of both inorganic and organic nature of the polymer elastic material. Soft and transparent, has good resistance to fatigue and tear strength.
Common silica gel hardness 40 °, 50 °, 60 °, 70 °, 80 °, the higher the hardness, Keypad feel better. But the hardness is too high will affect the life of Keypad. The lower hardness of the corresponding keypad after forming the more soft, feel worse, and the key hole with plastic will increase friction, easy to create Jam key.
 
Rubber Key key basic structure
Some basic dimensions on Key.
(1). Keypad thickness A
Generally taken to be A = 1.2 (1.5mm can be. Too thick cause cost increases, too thin is likely to have linked the shortcoming.
(2). Key itinerary S.
In the Printer, the general take S = 1.0mm, the minimum can not be less than 0.7mm, low feeling is difficult to meet our requirements.

Key Screen Printing.xls