Silicone Overmolding for Baby Products.
Precision bonding of silicone with plastic, metal, and composite inserts -- purpose-built for safe, durable, and beautifully engineered infant goods.
Capable
Silicone +
Plastic / Metal
Chemically bonded, mechanically locked, baby-safe.
Module 02 -- Silicone over Plastic
Soft Silicone Bonded to Rigid Plastic.
We combine food-grade LSR or HCR silicone with PP, PC, PCTG, Tritan, PA, and PES substrates. The result is a seamless hybrid: rigid structural performance with soft-touch, non-slip, baby-friendly contact surfaces.
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Primer-Assisted Chemical Bonding
For PP and PE substrates, improving peel strength up to 3x.
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Self-Bonding LSR
Direct adhesion to PA, PBT, PC, and Tritan without primers.
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Mechanical Interlock Design
Undercuts and keying features engineered for lifetime adhesion.
Common Pairings
LSR + PP / PC / Tritan / PES
Metal Substrates
304 / 316 Stainless · Aluminum · Brass
Module 03 -- Silicone over Metal
Food-Grade Silicone over Precision Metal Inserts.
Ideal for utensils, training spoons, teethers with chill cores, and bath accessories. We overmold silicone onto stainless steel, aluminum, and plated brass with controlled surface preparation.
Sandblast
Micro-roughening for mechanical bite
Primer
Food-contact approved adhesion layer
Degrease
Ultrasonic cleaning pre-molding
Plasma
Surface activation for stable bonding
Module 04
Insert Positioning & Fixation.
Reliable overmolding starts with precise insert placement. Our tooling and automation ensure every substrate is seated, located, and held within tight tolerance before silicone injection.
Robotic Pick & Place
6-axis robots load inserts with ±0.05mm repeatability for consistent cycle quality.
Vacuum & Magnetic Nests
Dedicated cavity nests hold inserts securely against injection pressure.
Datum Locating Pins
Multi-point locating features prevent drift and ensure concentricity.
In-Mold Verification
Sensor feedback confirms insert presence and orientation before shot release.
Module 05
Material Compatibility Matrix.
Not every substrate bonds to silicone the same way. Our materials engineers specify the right silicone grade, primer, and processing window for your target substrate.
| Substrate | Silicone Type | Bonding Method | Compatibility |
|---|---|---|---|
| PP / PE | LSR / HCR | Primer + Mechanical | Excellent |
| PC / Tritan / PCTG | Self-Bonding LSR | Chemical (Direct) | Excellent |
| PA (Nylon) | Self-Bonding LSR | Chemical | Excellent |
| PES / PPSU | LSR | Primer-Assisted | Good |
| Stainless Steel 304/316 | LSR / HCR | Primer + Sandblast | Excellent |
| Aluminum / Brass | LSR | Primer + Plasma | Excellent |
Module 06
Mold & Structural Design.
Overmolding success is engineered at the tooling stage. Our in-house mold design team specializes in two-shot, insert, and rotary platen tooling for complex baby product geometries.
±0.1mm
Dimensional tolerance
DFM & Mold Flow
Simulation of gate location, flow fronts, air traps, and curing to validate every cavity before steel is cut.
Cold Runner Systems
Zero-waste cold runner tooling for LSR, maintaining precise shot volume and reducing material cost by up to 30%.
2K & Rotary Tooling
Two-shot platens and rotary cube molds enable single-cycle production of soft/hard combinations.
Hardened Tool Steel
S136, NAK80, and 1.2344 tooling for a service life of 1M+ cycles, maintaining Class A surface finish.
Baby-Safe Design
Rounded corners, no sharp seams, parting lines placed outside mouth contact zones.
Rapid Tool Delivery
Prototype tools in 15-20 days, production-grade overmolding tools in 35-45 days.
+45%
Tensile strength improvement
500k
Flex cycles validated
-40°C
Low-temp aging tested
200°C
High-temp resistance
Module 07
Bond Strength & Functional Validation.
Every overmolded design is validated across mechanical, thermal, and user-condition tests to guarantee lifetime performance for infant use.
Module 08
Assembly & Post-Processing.
After molding, finishing operations transform the raw overmolded part into a market-ready product -- with the color, texture, logo, and functional finish your brand demands.
Deflashing & Trimming
Post-Curing (Oven Bake)
Silk & Pad Printing
Spray Coating / UV
Laser Engraving
Adhesive Backing
Ultrasonic Welding
Final Assembly & Packaging
Module 09
Mass Production Quality Management.
ISO 9001 governs every stage. From incoming materials to final packing, our QC personnel -- each with 5+ years of experience -- enforce documented SOPs for every batch.
100%
Full visual inspection
AQL 1.0
Sampling standard
IQC
Incoming raw material inspection (RoHS, REACH)
IPQC
In-process checks every shift and SPC monitoring
FQC
Full inspection: dimension, appearance, function
OQC
Outgoing audit based on AQL 1.0 sampling
Lab Testing
FDA, LFGB, CE, UL per batch certification
Module 10 -- Start Your Project
Request an Overmolding Evaluation.
Share your concept, drawings, or sample. Our engineering team will respond within 24 hours with a feasibility review, tooling plan, and cost estimate.
Phone / WhatsApp
+86 134 1898 3587