The Smooth-On Pmc 121 Series: Unparalleled Strength and Durability for Demanding Applications

When it comes to creating molds, reproducing sculpture and architectural elements, or making special effects, toys, and prototypes, you need a material that can keep up with your creative vision. That's where the Smooth-On Pmc 121 Series comes in – a line of high-performance, one-to-one by volume mix ratio urethane rubbers designed to meet the most stringent demands of production casting.

The PMC-121/30 is an exceptionally strong and abrasion-resistant rubber, perfect for soft urethane mold rubbers. It's ideal for casting waxes, Smooth-On liquid plastics, gypsum plasters, and other materials. Meanwhile, the PMC-121/50 is a "wet-only" mold rubber that offers long-lasting durability and versatility in a variety of applications, including reproducing ornamental plaster, precast concrete, and ceramic case molds.

What sets the Pmc 121 Series apart is its exceptional strength, ease of use, and ability to meet the demands of production casting. These rubbers can be used to create molds for a wide range of materials, from wax and plasters to concrete, resins, and epoxies. Plus, with the addition of So-Strong Color Tints, you can achieve vibrant colors that bring your designs to life.

To ensure successful mold making, it's essential to follow proper preparation and application techniques. Start by storing and using the materials in a room with low humidity and at a temperature of 73°F/23°C. Wear protective gear, including safety glasses, long sleeves, and rubber gloves, to minimize contamination risk. Apply a release agent specifically designed for mold making to facilitate demolding and ensure a smooth, bubble-free finish.

When mixing the materials, make sure to pre-mix Part B before using and mix thoroughly for at least 3 minutes, scraping the sides and bottom of the mixing container several times. For larger quantities, use a mechanical mixer followed by careful hand mixing. After pouring the mixture, allow it to cure overnight at room temperature before demolding.

Post-curing, the rubber can be heated to 150°F/65°C for 4 to 8 hours to increase physical properties and performance. When using the mold, apply a release agent before each casting, and sponge the mold with a soap solution for better plaster flow and easy release.

The Smooth-On Pmc 121 Series offers unparalleled strength, durability, and versatility for demanding applications. Whether you're a professional mold maker or an artist looking to bring your creative vision to life, these urethane rubbers are the perfect choice for creating high-quality molds and reproductions. With proper use and storage, the physical life of the rubber will depend on how you use it, with shrinkage varying between wet and dry rubbers. Contact Smooth-On directly for more information on how to get the most out of this exceptional material.