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.

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 Advantages

  • 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