Overmolding for Reliable Multi-Material Parts
Build stronger, cleaner, and more functional overmolded parts with engineering support from material review to production molding.
- Material compatibility review
- DFM support for bonding and shrinkage
- Tooling, T1 samples, and production molding
- Inspection for fit, flash, appearance, and stability
Upload Your CAD for Overmolding Review
Send your 3D files and requirements. Our engineers review part geometry, substrate material, overmold material, bonding area, and tooling risks.
All files are handled securely and confidentially.
Material Pairing
Quote & DFM Feedback
What Is Overmolding?
Overmolding is an injection molding process that combines a rigid substrate with a second material layer, usually a softer plastic or elastomer.
It improves grip, sealing, impact resistance, comfort, and product appearance while reducing secondary assembly.
- Rigid substrate for structure
- Soft overmold for function and feel
- One integrated multi-material part
Engineering Control for Overmolding Risks
Overmolding success depends on more than molding. We review material behavior, bonding geometry, tooling design, and production repeatability before cutting steel.
Overmolding Solutions We Support
From functional grips to sealed housings, GSG-Tech supports custom overmolding projects for prototypes, T1 validation, and production parts.
Plastic Over Plastic
For rigid structures with functional or visual overmold layers.
Soft-Touch Over Plastic
For grips, buttons, handles, covers, and user-contact surfaces.
Plastic Over Metal
For inserts, brackets, threaded parts, and reinforced assemblies.
Sealing & Protection
For impact resistance, sealing edges, vibration damping, and insulation.
Applications for Overmolded Parts
Overmolding is used where structure, grip, sealing, protection, or user comfort must work together in one part.
Choose the Right Molding Approach
Different parts. Different requirements. Explore the three most common molding approaches to identify the best fit for your design and performance goals.
Standard Injection Molding
Best for single-material plastic parts with stable geometry and high repeatability.
Insert Molding
Best when metal inserts, threads, pins, or components must be molded into plastic.
Overmolding
Best when a second material layer adds grip, sealing, protection, comfort, or appearance.
Need help choosing?
Send your CAD files. We will review the part structure and recommend the right molding path.