Urethane Casting

San-Tech’s Liquid Resin Molding (LRM) meter mix process uses polyurethane resins injected under low pressure into a closed mold cavity. The finished parts closely resemble injection molded parts or structural foam parts in appearance, weight and physical properties. We also offer pressure-casting to produce bubble-free parts and water-clear plastic parts.

The first step in LRM is fabricating a pattern for flexible mold cavities. We guarantee these mold cavities -- which may be made of silicone, urethane, aluminum, epoxy or other performance materials -- for runs of 10 to 10,000 parts. After mold completion, we mold the parts and complete any secondary operations required, such as multi-tone painting, texturizing or pad printing.

We use a variety of thermoset urethane resins that have low shrink rate and physical properties similar to thermoplastics. We also offer molded-in color, painting, silk screening and RFI coatings.

Recent developments at San-Tech include our ability to produce Parts in Minutes™ with Ciba-Geigy’s RP 6453 Flame Retardant (UL 94V-O at 1/8") Rapid Prototyping Polyurethane System. By using the RP 6453 system, which incorporates a polyurethane resin and hardener, we can produce cast parts faster than ever before, using low-cost tooling options such as silicone, polyurethane, epoxy or aluminum molds. The system permits demolding in as little as 45-50 minutes depending on configuration. Parts made with RP 6453 have the look and feel of thermoplastic, with high impact strength, thermal resistance and good dimensional stability.

For medical products, we also offer a special formulation using Hapco’s Tuffalloy 280 Series that enables us to cast parts that meet USP Class VI biocompatibility standards.

Tel. 888.GO.RAPID (888-467-2743) • Fax 978.977.9072 • E-mail: sales@santineng.com