What is the silicone pad made of?

The silicone pads used in pad printing are made of RTV silicone.  These silicone pads are available in a variety of durometers ranging from 65 to 20 Shore A (measured on the 00 scale).  Silicone transfer pads for pad printing are available in a variety of formulations and they are resistant to such things as excessive heat, abrasion, tear resistant, static energy and chemicals (such as the pad printing thinners, retarders, and hardeners).