Vacuum casting, also known as urethane casting or silicone mold casting, is a rapid prototyping process used to produce high-quality plastic parts in small batches. The process involves creating a silicone mold from a master model and filling it with polyurethane resin under vacuum pressure to eliminate air bubbles and ensure excellent surface finish and dimensional accuracy.

This method is ideal for low-volume production, functional testing, design validation, and marketing samples before mass production. It provides an efficient and cost-effective way to bridge the gap between prototype and production.