Skin Safe Silicone Rubber for 3d Prints

I needed to find some skin-safe and food-safe silicone casting material for my projects. I knew about a food safe silicone putty for making chocolate molds, but it wasn't sturdy enough to make cases and jewelry with. If I wanted to make wearable electronic sensors and jewelry, then I needed to find a pourable liquid version that would be safe to wear next to the skin for hours.

Sure, I can design and 3d print a case - been doing it for a while. But the surfaces are rough, they aren't very flexible, and I don't trust the plastics. I've read too many stories about rashes and reactions to mystery plastics. I wanted something that I could wear and that I felt safe giving to other people to wear, something that wasn't rough or toxic or irritating to the skin.

Think of Fit-Bit cases, Swatch watchbands, Croc shoes or even that Cosplay costume that you wear to every convention. I'm okay with a few VOCs and weird plastics touching my skin occasionally. But if I'm going to wear a product all day, seven days a week then I want to know it's safe. And I want my customers to be safe. So, I did some research and wound up finding the same company I've used for years.

I've used Smooth-On casting plastics for years, (affiliate) but I found out they also make a huge line of other products including a wide selection of food and skin safe silicones. They all have special characteristics that make them good for wearing next to the skin and some for making food with. And they all make good molds for casting resin in, so I could always use them for producing other items.

So, I made a quick list of the various food/skin safe materials (NOTE: Food-safe and Skin-safe are not the same thing.)