Pretty new to casting and need some advice. I want to mold and then cast a small piece of hard rubber that measures only 4mm x 3mm x 4mm.
It's made from a hard rubber, not entirely too sure what, bottom it concave. I've already tried making a mold from some old food-safe heat in the microwave re-usable gel, whilst it made a pretty good mold when I tried to cast it with some of the same material it didn't work.
What materials should I ideally buy? The rubber needs to be pretty hard, almost like a hard rubber washer.
Apologies for not knowing all the jargon, any questions please ask.
First I'd make a mold of the piece pictured, in either a one piece mold or a two piece (either should be fine) using one of the tin cure mold materials like HS-2 or HS-3. The HS series (HS stands for high strength) are easy to cure and can handle some roughness when demolding. For the material for the copy, Flex 80 or Performance 80D (in the casting resins) should be the right rubbery hardness. No jargon needed here, we don't use much anyway. Be sure to read the data sheets on both and feel free to ask if you have more questions.
Thanks notoes, going to have a good search online. Defiantly need something a little harder for the mold. Somebody already recommended the Flex 80 so will see if I can get it in the UK. I'll be sure to let you know how it goes and post up some pics...
You're welcome. The HS-1 is a fairly stiff mold material so it might be good. I normally use HS-2 or 3 and both are plenty hard enough for everything I mold in them. Yes please do keep us updated, I like to hear how others do things as it's always good to see other methods of using certain products.