Usually first a tool is needed from which the silicone keypads are made of. Compared to tools of plastic parts these tools a much cheaper. Please find here some examples:

We have also standard tools available from where we can offer silicone keypads which do not require extra tool to be paid:
With the same production technology also other products can be offered. For example covers for mobile devices like cell-phones, payment terminals or other. For consumer-products such covers mainly are made of TPE-material. TPE is by far not so resistant against environment as silicone rubber but cheaper in price. We prefer silicone rubber but can offer TPE-material as well.

Since many years we are working together with Shin-Etsu Polymer (Japan) www.shinetsu.info/keypads and Win Industry  (Taiwan) www.win-industry.com