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What is a Resin Mold?

By Lydia Schrandt
Updated May 16, 2024
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A resin mold, typically made from flexible rubbers, allows both natural and synthetic resins to be cast into pre-determined shapes. Resin molds can be used to create plastic-like parts for use in manufacturing or for lightweight jewelry components. A silicone resin mold provides the most versatility, as it will not require a separating agent to prevent the resin from sticking. Other resin mold materials include latex, plaster, metal, and fiberglass. Softer mold materials, such as silicon and soft rubbers, make ejecting the finished resin piece simpler, but rigid mold materials, such as plaster, fiberglass, metal, and wood, are less likely to warp with repeated use.

When creating a resin mold, a three-dimensional (3D) object is used to give shape to the mold. This object is called a model. Complex resin molds are made by placing a model in a container and pouring clear rubber around the object. After the rubber dries, it can be cut into two pieces, each piece resulting in a mold for one half of a resin piece.

Sometimes pliable resin molds can lose their shape after several uses. Backup molds are more rigid molds used to support flexible rubber molds during the resin-casting process. A backup mold prevents the primary rubber molds from distorting when casting resin is added. These molds can be made from plaster, fiberglass, or sometimes wood.

Once a resin mold has been created and a separating agent applied, casting resin is poured into the mold to cure. Most resin molds can be used multiple times to create nearly identical resin pieces, especially if used with a backup mold to prevent distortion. Coloring agents can be added to clear resin to change the color of the finished pieces. Small objects or additives can be suspended and sealed within clear resin if added during the casting process.

Natural resin comes from coniferous trees, such as pine, folded birch, and many varieties of palm trees. The sap of these trees, made up of volatile fluid terpenes, is extracted in a viscous state and hardens over time. Natural resin often contains impurities and can be quite unpredictable when exposed to heat.

Synthetic resins are produced through polymerization of molecules to produce a highly stable viscous substance similar to that found in trees. Such synthetic resins have gained popularity due to their purity and more predictable behavior. Low viscosity clear resin, found in craft supply stores, must be combined with a hardening catalyst before it will cure.

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Discussion Comments

By pastanaga — On Nov 05, 2011

If you aren't looking to make your own kind of mold, there are all sorts of molds available online. You might have a look at different silicon molds for ice cubes, or for chocolates. Silicon or rubber is best, just because they make it easier to release the resin afterwards.

I've found molds for the strangest things online, so even if you think your idea is unique and will need to be made from scratch I would have a look first to make sure that someone else hasn't already made a professional version.

By Mor — On Nov 04, 2011

@irontoenail - It's actually pretty easy and cheap to make a resin cast, and I learned how to do it in art school, so it really is just as good a technique as the ones provided by kits from a supply shop.

You buy one of those silicon sealant guns, which are usually only a few dollars, and use that to create your mold.

What we usually did was make the model we wanted to cast out of Plasticine or clay, then start covering it with layers of the silicon. You have to do it in layers because it won't dry properly if you put it on too thick.

Then we would cut it where ever we wanted the join to be, and encased the mold in plaster in order to keep it steady.

You can probably find more detailed guides online, but it is definitely possible to do it professionally on the cheap.

By irontoenail — On Nov 03, 2011

Is there any way of making a kind of DIY resin casting mold? I've seen kits in craft stores that allow you to make a mold, but they always seem very expensive, and I don't really have that much money to spend.

I'm just hoping to test out a few arts and crafts kinds of ideas, nothing too fancy. If they work out, I might get the more appropriate molds made, but if they don't I don't want to be out of pocket, particularly considering how expensive resin itself is.

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