RTV Molding

An RTV silicone mold is created by casting liquid silicone around a master model, which may be produced through CNC machining, 3D printing, or an existing production part. Once the silicone cures, the master is removed to leave a mold cavity that accurately reproduces every feature of the original design.

The flexibility of silicone allows the mold to capture intricate details, textures, and challenging geometries while making part removal easier. This process produces cast urethane components that closely resemble injection molded parts in appearance and function. At Advanced Prototype Molding, every RTV silicone mold is produced with close attention to dimensional accuracy so your parts meet project expectations from the first run.

Creating the Master Pattern

Every project begins with a master pattern created from a CAD model, CNC machining process, 3D printing, or an existing component. This master serves as the reference for every molded part.

Building the RTV Silicone Mold

The master pattern is surrounded with liquid silicone that cures at room temperature. Once cured, the mold is carefully separated to reveal the cavity used for casting each part.

Casting the Urethane Material

Polyurethane resin is poured into the RTV silicone mold and allowed to cure. Material options can be selected to match specific mechanical, cosmetic, or performance requirements.

Finishing the Part

After curing, each part is removed from the mold and completed with trimming, painting, color matching, texture replication, inserts, or other finishing services as needed.

RTV molding offers an efficient solution for projects that require production-quality parts without the investment of steel tooling. It reduces development costs while providing quick turnaround times and excellent visual quality. Since silicone molds can accurately reproduce fine details, they are well suited for customer presentations, engineering validation, and functional testing. Design revisions are also easier to accommodate, allowing product changes before committing to production tooling.

Advanced Prototype Molding provides custom silicone molding services to match your project requirements. From mold creation to finished components, our team works closely with you to recommend suitable materials, finishes, colors, and production quantities. Whether your project requires molded inserts, textured surfaces, painted finishes, or overmolded features, we provide practical manufacturing support from prototype through low-volume production.

RTV molding supports a wide variety of industries, including automotive, medical, industrial equipment, consumer products, and electronics. Customers rely on this process for functional prototypes, engineering samples, appearance models, bridge production, replacement parts, and short manufacturing runs where production tooling is not yet practical.

RTV molding is often the preferred option for low production volumes because silicone tooling can be produced quickly and at a lower cost than steel or aluminum molds. Injection molding becomes more economical for higher production quantities, while RTV molding provides greater flexibility during product development and design validation. Choosing the right process depends on production volume, project timeline, and budget.