Liquid resin, such as epoxies, polyurethanes, silicones, and polyesters, is used for casting in molds to produce intricate and accurate parts. It’s widely available and inexpensive, but safety precautions must be taken when working with it.
Liquid resin is a synthetic fluid which, when mixed with a curing agent, dries quickly into an extremely strong solid. Some of the more common liquid resins are epoxies, polyurethanes, silicones, and polyesters. Thanks to their moldable properties and final hardness, these resins have many applications. They are used, for example, to produce floor coverings, electronic casings and even decorative sculptures. One of the more popular applications of liquid resin, however, is casting.
Resin casting is a process in which liquid resin is combined with a curing fluid and then poured into a mold. When the curing agent meets the resin, a chemical reaction occurs which causes the mixture to heat up and then rapidly hardens, holding the shape of the mold it was cast into. Once fully cured, the casting is removed from the mold and, depending on the caster’s needs, can be sanded, painted or joined with other molded components.
This process is commonly used to produce dental castings, industrial product prototypes, and toys. Liquid resin casting supplies are fairly inexpensive and the process can easily be done in a home workshop. As a result, it is also widely employed by recreational crafters and hobbyists to produce jewelry and scale models of automobiles, airplanes, and so on.
The molds used for resin casting are usually made of flexible rubber and can be manufactured by the user, purchased from a specialist shop or specially ordered. These molds can be crafted to include high levels of fine detail transferred to the casting, thus making resin casting an attractive option for those looking to produce intricate and accurate parts. Because the chemicals in liquid resin combined with the heat it produces can be destructive, however, casting molds usually begin to break down with extended use. Therefore, resin casting is generally not suitable for large-scale production.
Casting supplies and liquid resins are widely available at hardware and craft stores as well as hobbyist websites and catalogs. Once cured, the resins are generally non-hazardous. While in a liquid state, however, they can aggravate the eyes and skin, and their fumes can cause a sick feeling if inhaled in large quantities. Users must take safety precautions when working with liquid resin. We recommend that you read all product instructions, wear safety glasses and gloves, and avoid working in enclosed, unventilated areas.
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