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RIM Molding Technology
Reaction Injection Molding systems combine two liquid components that chemically react in a closed mold to form a polyurethane plastic part. Unlike processes which require very high temperatures and pressures to melt and force plastic into a steel tool, RIM molding requires significantly less energy to greatly reduce overhead costs. Tools can be machined out of aluminum for less expensive molds, shorter lead times, and greater flexibility in design and tooling changes.
RIM is often a great alternative for designers who want the mainstream look of molded parts but cannot justify the tooling costs and volumes of typical thermoplastic parts. With RIM, you can develop a sculpted, structural design that minimizes hardware and includes value-adding features, all at a price point that is cost-effective for low to mid-range volumes, especially for larger complicated parts.
Volumes: RIM is an optimal choice for low to medium volume production. Because initial tooling investments are low, short runs remain economically viable and allow companies to minimize inventory while the product’s market success is being evaluated. RIM molds are easier to machine so design changes can be made quickly as needed, and the process is often a more economical choice compared to rubber molding.
 Part Size: Because such low pressure is needed, RIM is one of the most cost-effective options for molding large parts. There are no upper size limitations, other than equipment capabilities, for part design in RIM. If additional strength or stiffness is required, RIM parts can be reinforced with composite fibers.
Design Complexity: One of the most unique features of RIM molding involves the ability to produce parts with significant wall thickness variations - typically from .125" to 1.125" in the same part. This eliminates the design and tooling time it takes in traditional processing methods to core out complex part areas.
 Durability: Urethane RIM parts are highly durable, skid resistant, mar resistant, and virtually unbreakable. Ribbing ensures large parts won’t “tin can” or show sink marks like those that can occur in other injection molding processes. They are also inherently chemically resistant and possess high impact strength.
Encapsulation: The low molding pressures and temperatures of RIM allow even the most sensitive electronic boards and components to be encapsulated without damage. You can increase strength, mass, burst protection and insulation and add value to the appearance of almost any material with RIM encapsulation.
Appearance: The surface finish of RIM molded parts can be painted to produce Class A parts. Silk screening and other surface treatments can also be applied to add to the appearance and branding of the product’s design.
The low cost tooling investment of RIM alleviates risk while expediting lead times. Exothermic is able to cross the gap between prototyping and production with tools that yield molded parts instead of fabricated ones. Our in-house, high speed MasterCAM can machine in features such as vents, side holes and undercuts for a prototype within 2 to 3 weeks. The low-pressure tools are easy to modify so design changes can be implemented based on the product’s market success for a low cost.
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