Pittsfield Plastics has developed a strategic alliance with a premier source for high quality polyurethane molding. We use the design we’ve developed and prototyped to take the next step in the development of a product. Our strategic partner uses polyurethane molding for its Pre-Production Short Run proof of concept process.
This is the precision alternative to injection molding. This process is especially effective in low volume applications of 3 – 100 parts, with first parts in as little as one week. Typical deliveries range from two to four weeks.
(as written by our partner)
A master pattern is created through CNC machining or 3D modeling from your data. The master is lightly painted with primer and attached to a parting line board. Any required cores or side actions are added, and one side of the master is covered with a mold box. This box is filled with RTV silicone rubber. After curing, the parting line board is removed, the other half of the mold box is attached, and the process repeated. The master pattern is removed from the mold. It may now be used as an engineering model, or to produce multiple RTV molds for enhanced production.
Conventional polyurethane resin is injected at low pressure into the RTV mold and allowed to cure for 2 – 12 hours in tanks maintained at 65 PSI to allow for proper material density. Available resins include custom colored, clear and custom tinted clear, glass-filled, and UL94-VO, in a range of duro-meters from 40A to 90D.
Our precision meter mixing system allows for rapid production of parts (up to 10 per day, per mold) using a UL94-VO rated, 80D polyurethane. This system also exhibits a heat deflection of 200° F.
Call us today if you have any questions.