RIM Process vs. Others for Polyurethane Parts Manufacturing

Comparison gives us a very positive reaction.

Reaction injection molding has many benefits: low tooling costs, short lead-times, large lightweight parts, high tolerances, enhanced design finish, desired chemical resistance properties, 94V-0 and HB ratings, customizing part properties, and molding over metal, wood, glass, computer chips and other parts.

Reaction injection molding is generally most cost-effective for the production of a few hundred to several thousand parts, but one RIM Manufacturing client has looked to us to produce more than 1,000,000 parts per year for 10 years.

LipiView BlackEye product

Injection Molding

RIM Advantages

  • Approximately 70% less expensive
  • Molds thick, lightweight structural parts without sink
  • Varying wall thicknesses on same part
  • Similar tolerances to injection molding
  • Molds over metal, glass, wood, wiring, circuit boards, hardware, etc.
  • Much better economies for lower volume parts
  • Shorter tooling lead times

Injection Molding

  • Low tooling cost
  • Shorter lead-time
  • Lower high-volume per-part cost
  • Colored plastic parts don’t need paint
  • Finer part detail
  • Greater range of material choices


RIM Advantages

  • Much greater design freedom
  • Lower costs for complex parts
  • Higher part tolerances
  • Combination of multiple parts
  • Molded-in bosses, ribs and other 3D features
  • Thicker, stronger parts

Thermoforming Advantages

  • Less expensive simple parts
  • No paint needed for single-color parts
  • Generally less expensive tooling

Rotational Molding

RIM Advantages

  • More sophisticated design
  • Higher tolerances
  • Increased strength and durability

Rotational Molding Advantages

  • Hollow part molding

Sheet Metal

RIM Advantages

  • Much greater freedom to design attractive, sculpted parts
  • Less expensive complex or curved parts
  • Generally lighter-weight parts
  • Enhanced sound and vibration insulation
  • In-mold painting
  • Soft-touch or flexible parts possible
  • Encapsulation of parts – glass, metal, wood, wiring, circuit boards, etc
  • High corrosion- and rust-resistance
  • Non-conductive

Sheet Metal Advantages

  • Parts sometimes structurally stronger
  • No additional EMI/RFI Shielding needed
  • Less expensive tooling
  • Lower expense for simple parts

Die Casting

RIM Advantages

  • Lower weight
  • Higher tolerances
  • Greater design freedom
  • No brittle parts
  • Net shape with no machining
  • Corrosion-resistance

Die Casting Advantages

  • Low tooling cost
  • Shorter lead-time