Rapid Custom Manufacturing

Reaction Injection Molding (RIM) is a Cold and Low-Pressure casting process that specializes in low volume manufacturing large and complex-geometry parts quickly and economically. The commonly used molding material is liquid bi-component polyurethane (PU) of polyol and isocyanate, when the two liquids are mixed together at certain amount ratio in mixing head, a chemical exothermic reaction begins to create polyurethane resin, then the liquid mixture is quickly injected into and fully fill the mold cavity at low pressure and room temperature to cast the parts.

At Honkia, our RIM molds are mostly made of epoxy resin, silicone rubber and steel frame, sometimes aluminum alloy, cost just around 5% of the conventional steel molds used for mass production, mold manufacturing time takes usually two or three weeks instead of months or more longer. So our RIM process brings cost and time savings as much as possible, and favors the innovative low volume production projects under limited budget and pressing time.

The Cold and Low-Pressure injection molding brings excellent molding tolerance 0.15/100 mm and consistent geometry to our RIM parts though the molds are made of mainly plastic instead of rigid steel. The soft silicone rubber pieces of the mold will be replaced by fresh ones after usually 100 shots to ensure a stable molding tolerance, mold lifetime 500-1000 shots, which also brings good flexibility in supply to meet market demands, without holding excessive stocks.

Low volume production, good flexibility and durability are the great features of our RIM parts that play a crucial role in many industries and sectors, including medical devices, transportation, telecommunication, construction, agriculture, etc. The parts can be sandblasted, painted in different colors and textures, silk-screened, insert molded and overmolded.

Though our Reaction Injection Molding works fine for molding various wall thicknesses, uniform wall thickness and proper draft angle are still recommended during part design to achieve improved quality, consistency and efficiency. We look forward to doing more and better through our continuously improving RIM expertise and experience.