I’m looking for some castable rubbers. So far, I’ve identified silicone as the most likely choice (the kind you use in a mold, not the kind for making molds). Specifically, the requirements for the material are:
- castable/moldable with up to 1" wall thickness
- flexible, soft and stretchy (about 200% elongation before break, or more, would be good)
- 100% transparent
- non-toxic
- relatively long life
- thermally stable up to ~100 degrees C
- UV stable would be a boon but isn’t required
- specific gravity close to water would also be nice
- not too expensive, since I’m only a poor student
Basically…think sex toy but squishier . The first four requirements are the most critical.
Anyone have some ideas for either (1) where I could get clear, castable silicone in a durometer rating of ~15-25, or (2) any other materials that fall in the same general area? So far I’ve identified Smooth-On Dragon Skin ™, which is a little soft (D=10) but might work; and medical-grade implant silicone, which is perfect but highly expensive.
Silicone caulking will NOT work; it won’t harden all the way through.
Thanks to anyone who can help.