RIM Design Guidelines Request for Quote

Design Octaves Sample Parts

Design Octaves understands that your project begins at the design phase. That is why it is our objective to make sure that you achieve the best possible results for your project. We also recommend that you contact us during the early phase of your design process to mitigate engineering costs. Our team of experienced engineers has the capabilities to answer any of your questions regarding the RIM process, solutions to your design challenges, or to recommend adjustments that will improve the quality of your part.

RIM Material System

Our parts are molded in two different rigid self-skinning RIM systems:

DOW Voracor CS 996 / CE 125: 3mm minimum wall thickness to be U.L. 94-V0 rated
DOW Voracor CS 984 / CE 123: 6mm minimum wall thickness to be U.L. 94-V0 & 94-5VA rated

Both RIM systems are proprietary mixes, designed specifically for the molding of rigid cosmetic covers and electromechanical equipment enclosures. The U.L. file number E76646 is shared by both RIM systems.

Wall Thickness

A minimum of 3mm (0.118”) or 6mm (0.236”) wall thickness, depending on the system, must generally be applied to maintain the U.L. rating
Small, isolated areas can be molded as thin as 2mm (0.080”) and as thick as 25mm (1.00”)
Due to the absence of sink lines in the RIM molding process, parts can be designed with both thick and thin walled areas

Draft Angles

Ideally 1° draft on outside cosmetic walls and 2° draft on inside walls
Limited areas of 0° draft can be accomplished with the use of removable core pieces

Bosses

A typical boss with a 6-32 threaded insert should be about 0.500” at the top
Draft angles of 1 to 2 degrees per side

Undercuts

Undercuts can be achieved by using removable aluminum core pieces

Radii & Fillets

Ideal edge radii is a minimum of 1mm (0.039”)
Ideal internal fillet is a minimum of 3.2mm (0.125”)

Threaded Inserts

All threaded inserts are molded-in, ensuring repetitive location and excellent pull-out strength
We maintain a complete inventory of both metric and standard brass inserts, with stainless steel available upon request

Over Molding

Mold tools can often be designed to accommodate the over molding of secondary hardware and components i.e. – stand-offs, magnets, small sheet metal brackets, etc.

Recommended Tolerances

METRIC

0.X = +/- 0.5mm up to 127mm, add 0.05mm per 25.4mm over 127mm
0.XX = +/- 0.25mm up to 127mm, add 0.025mm per 25.4mm over 127mm

ENGLISH

0.XX = +/- 0.020” up to 5.00”, add 0.002” per inch over 5.00”
0.XXX = +/- 0.010” up to 5.00”, add 0.001” per inch over 5.00”

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