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Blog - silicone molds

Silicone is Better For Toys, Not Molds.

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Silicone is a nice rubber, but is it worthwhile to use it for silicone molds?

    • You are making several to a dozen or more duplicates of your original. The actual number of duplicates you can get out of one mold will vary depending on the casting material and complexity of the mold. With chocolate or soy wax, you can make hundreds of duplicates with the same mold. With concrete the number is lower. BUT, when you’re mold starts to lose detail, just re-melt it to make it again. Anytime you want.
    • You want great detail, the option to make changes, the ability to make molds anytime you like, and you like to be environmentally conscious.
    • Want to save money

    Don’t use the re-usable molding materials when:

    • Your mold needs to go into an oven or other hot source. The silicone molds can typically handle up to 400 F, so if you’re cooking in the molds, silicone would be better.
    • Your casting with hot materials such as pewter (even silicone can’t handle higher melt metals).
    • Also, if you’re making a lot of duplicates of a larger piece (1/2 cubic foot or so) with a fast cure resin, then you’d be better off using some silicone molding material, but even here, I would recommend using a brush-on silicone that is backed up by either a plaster mold or a re-usable rubber molding material (ImPRESSive Putty).

    Look at some of the silicone mold options

    First, the “cheap” silicone molds that are shown on a zillion YouTube channels really aren’t that cheap. It’s called Oogoo, and it is cool, but it shrinks by 25 to 35% over a week or two depending on the humidity, Plus, it’s not exactly cheap if you are going to make a few molds. This is the dilemma I ran into when I was molding parts for my model airplane pieces. These molding supplies adds up!

    Using Oogo as a Silicone Casting Material instead of a Silicone Mold:

    Video at https://youtu.be/vfwN3R-pv1I

    The silicone materials sold specifically for silicone molds are nice, but they are expensive. Here’s the graph I bring up whenever making this comparison. One silicone mold cost about as much as one re-usable mold. So after 10 molds, it would cost you $500 in molding material costs. Whereas, with a reusable molding material, your molding costs would still be the cost of one mold.

    The Cost of Silicone Molds Continuously Goes Up, But Not For Re-usable Molding Materials
    The Cost of Silicone Molds Continuously Goes Up, But Not For Re-usable Molding Materials

    So the solution, use the silicone for your castings! It’s a great rubber. Use it to make the soles of your shoes, for your Stretch-Armstrong doll (err sorry-action figure), for your IPhone case. Dozens of uses. But not mold making.

    Here we use Silicone for a Cosplay/Theater Prop of an Axe. But we didn't use the silicone for the mold.

This is NOT for Making Silicone Molds

Have your ever tried to make your own silicone molds? If so, I'm sure you have made many a mold that did not work the way you wanted it to. Did your part float? Did you have bubbles? Did you want to make changes and realize that the silicone is a two part molding material [...]

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Silicone Molds from Oogoo vs. ComposiMold Molds

We want to compare ComposiMold Re-usable Mold Making Materials to the so-called cheap and easy silicone molding material that you can make from silicones found in your hardware store. These are sometimes called Oogoo. We’ve used them for casting in ComposiMold molds. But like most materials, they have some limitations and aren’t as cheap as they are made out [...]

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Why ComposiMold for Mold Making? Because it works