Custom Overmolding Services

The overmolding process involves the molding of one plastic material over another, ensuring a seamless combination of multiple plastic parts to create a uniform and durable product. Insert molding and multi-shot molding processes are utilized to combine materials for both functional and aesthetic purposes. Scojet employs these techniques in their plastic injection overmolding to ensure that every component meets industrial standards.

Our custom overmolding services offer high-quality solutions for prototypes and on-demand production parts. Enjoy the convenience of quick quotes, short turnaround times, and competitive pricing. We have no minimum order quantities, and our rapid tooling production can be completed in as fast as two weeks. We are ISO 9001:2015 certified and provide 24/7 engineering support.


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What is Overmolding?

With overmolding, the production of the substrate parts is a standard injection molding process involving an aluminum mold with no heating or cooling lines running through it. Cycle times are a bit longer, which allows our molders to monitor fill pressure, cosmetic concerns, and the basic quality of the parts. When the total run of substrate parts are molded, overmold tooling is then assembled to the press. The substrate parts are placed by hand into mold where each part is overmolded with either a thermoplastic or liquid silicone rubber material.

Overmolding Capabilities

Custom overmolding services ensure the creation of plastic parts that look and perform better. Our production line consists of an overmolding injection molding process that allows us to combine several different materials into one, ensuring you get superior-quality products.

StandardsMetric UnitsImperial Units
Maximum Part Size400×200×100mm15.75×7.87×3.94in.
Minimum Part Size2×2×2mm0.08×0.08×0.08in.
Substrate Wall ThicknessFrom 0.5 to 3mmFrom 0.02 to 0.12 in.
Tolerance+/- 0.025 mm+/- 0.00098 in.
Depth100mm from the parting line3.94in. from the parting line
Mold ValidationProvide T0, T1, T2 samples before mass production
Inspection and Certification OptionsFirst Article Inspection, ISO 9001, TS 16949
Lead TimeFrom mold making to sample delivery: 15-45 business days

Overmolding Material Bonding

Chemical bonding between overmolded materials is possible, but material compatibility should be considered in order to achieve desired bond strength. Incorporation of an adequate mechanical bond is strongly recommended if bonding is critical to your application. An undercut is a good example of a mechanical bond.

Substrate Material
Overmold MaterialABS LustranABS/PC CYCOLOY C2950-111PC Lexan

PBT Valox


PP Profax 6323

TPU – Texin



TPV – Santoprene



TPE – Santoprene



LSR – Elastosil

3003/30 A/B

TPC – Hytrel 3078CCCCM

TPE-Versaflex OM



TPE-Versaflex OM



TPE-Versaflex OM



TPE-Versaflex OM


M = mechanical bond (recommended)
C = chemical bond

Gallery of Overmolded Parts

Applications of Overmolding

The injection overmolding process is versatile and can be used with a broad range of materials, including plastics and metals. This method is instrumental in manufacturing custom prototypes and production parts tailored to your specific needs, catering to various applications. Numerous industries benefit from the advantages of overmolding services.





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