In recent years, we’ve noticed more and more customers showing interest in 2k overmolding（double injection overmolding), so we’d like to share some insights on the technology, performance, pricing… for better reference.
Firstly from Advanced Technology
- Two-shot Overmolding:
- Integrates two materials (e.g., ABS + LSR) in a single molding cycle
- Requires dual-cavity molds and specialized injection machines
- Ensures precise material placement, consistent tolerances, and strong bonding
- Eliminates manual assembly, reducing potential errors
- Standard Overmolding:
- Single-material molding followed by secondary coating or manual assembly
- Simpler molds and equipment
- Integration is less precise, bonding strength depends on post-processing
Secondly Functional Differences
- Two-shot Overmolding:
- Stronger material bonding, more durable in use
- Can provide multi-hardness zones for improved grip and ergonomics
- Enables better sealing, anti-slip surfaces, or integrated functional features
- Standard Overmolding:
- Bonding may be weaker, risk of delamination under stress
- Limited control over hardness zones and grip
- Functional enhancements often require secondary operations
Finally Price Comparison (Simplified)
- Two-shot overmolding → higher mold and per-unit cost due to process complexity
- Standard overmolding → more cost-effective with simpler tooling and production
✅ Takeaway
For cost efficiency and simpler production → standard overmolding
For precision, durability, and enhanced functionality → two-shot overmolding
