Height: 1.02 in
Length: 3.30 in
Width: 1.33 in
Reusable molds, heat mold in hot water and press fit a desired design, repeat to reset to a different design.
Ages 14+
What is Oyumaru?
It’s a thermoplastic from Japan that melts when you put it into hot water and then hardens as it returns to room temperature. You can make a mold from Oyumaru, or you can use Oyumaru itself in a mold to create small plastic charms. It is easy to use, requires no special tools or chemicals, and can be used over and over again.
Because Oyumaru is relatively stiff, even when melted, it will not work well to create molds from soft, fuzzy, or very flexible things. So it works great to make a mold from a button, but not so well to make a mold from a leaf. (Though if you pressed a leaf into warm Oyumaru, it would take the texture of the veins quite well.) Oyumaru works nicely to make molds from small sculptures and charms, to create texture stamps, or to copy the texture of something to be impressed onto modeling clay, polymer clay, or even metal clay.
Once you make a mold or texture with Oyumaru, you can keep it indefinitely. It doesn’t give off any residue, dry out, or melt at normal room temperatures. Once you’re done with it, though, you can just pop it back into the hot water to melt it down again and make something else. This means that Oyumaru is a perfect reusable mold material for when you want to make only a few items and don’t want to keep the mold permanently.
Because Oyumaru melts in hot water, however, you can’t bake polymer clay items in the mold. You also want to keep Oyumaru molds away from hot areas such as attics and cars in summer.