Beyond a Single
Material.
Engineered Together.
YMS specializes in the integration of silicone with plastics, metals, and functional inserts -- delivering baby products that combine the softness of silicone with the strength and precision of engineered structures. From concept to mass production, we handle every bonded interface with meticulous care.
Layer 01
Food-Grade Silicone
Layer 02
Rigid PP / PC / ABS
Layer 03
Stainless Steel Core
01 -- Silicone × Plastic
Soft Touch Meets
Structural Precision.
Combining food-grade silicone with rigid engineering plastics such as PP, PC, ABS, and Tritan enables lightweight, dishwasher-safe baby products with sculpted grip zones, transparent bodies, and durable functional joints.
Compatible Resins
PP, PC, PCTG, Tritan, ABS, PA -- all food-contact certified.
Bond Techniques
Chemical adhesion via primer, mechanical interlock, LSR-to-thermoplastic overmolding.
Typical Products
Sippy cups, bottle bases, teether handles, divided plates, straw cups.
Bond Test
≥ 12 N/cm²
Peel adhesion strength
Cycle Time
45s avg.
Two-shot overmold
304
Stainless
316L
Medical
Al
Aluminum
02 -- Silicone × Metal
Durable Cores.
Gentle Contact Surfaces.
For products requiring stiffness, weight, or heat resistance -- such as feeding spoons, teething tools, and utensil sets -- we bond food-grade silicone directly onto stainless steel or aluminum inserts using primer-based adhesion and precise mold locking.
Surface Treatment
Sandblasting, plasma cleaning, and adhesion primers ensure long-term bond integrity even after 1,000+ dishwasher cycles.
Insert Positioning
Precision-machined jigs hold inserts within ±0.05mm -- critical for consistent wall thickness and bonding contact.
Safety Certifications
Materials pass FDA, LFGB, and heavy-metal migration tests suitable for infant contact.
03 -- Process Architecture
Overmolding & Insert Molding Structures.
Two proven techniques allow us to bond silicone permanently with rigid substrates. Each is chosen based on part geometry, production volume, and adhesion requirements.
Overmolding
Silicone is injected directly over a pre-formed plastic substrate in a single or two-station mold. Ideal for soft grips, seals, and ergonomic surfaces on rigid components.
- Seamless bonded interface -- no gaps for bacteria
- Uniform wall thickness (1.2 - 3.0 mm)
- Best for high-volume runs above 10K/month
Insert Molding
Metal or plastic inserts are placed into the mold cavity, then encapsulated with silicone. Perfect for structural cores, magnetic elements, or reinforcement ribs.
- Combines dissimilar materials in one piece
- Precise insert positioning within ±0.05 mm
- Enables functional features: sensors, cores, hooks
04 -- Compatibility
Every Bond, Tested.
Every Interface, Verified.
Before tooling begins, our engineering team runs a full compatibility matrix -- evaluating adhesion, shrinkage, thermal expansion, and long-term aging between materials.
| Base Material | Silicone Type | Adhesion | Recommended Use |
|---|---|---|---|
| PP (Polypropylene) | LSR + Primer | ● Excellent | Sippy cups, bottle bases |
| PC / Tritan | LSR Self-bonding | ● Excellent | Transparent bottles, teether shells |
| ABS | Solid + Primer | ● Good | Toy structures, handles |
| Stainless 304 / 316L | HTV + Primer | ● Excellent | Spoon heads, utensil cores |
| Aluminum (anodized) | LSR + Primer | ● Good | Lightweight bodies |
| Nylon (PA6 / PA66) | LSR Self-bonding | ● Excellent | Reinforcement ribs |
Peel Test
ISO 813 standard
Thermal Cycling
-40°C to +200°C
Aging Simulation
1,000+ hrs UV / heat
05 -- Structural Fit
Tolerance is Where Trust is Built.
Multi-material parts fail not from material choice -- but from mismatched shrinkage, unequal draft angles, or improper mechanical locking. We resolve every fitment risk at the DFM stage.
±0.1mm
Overall tolerance
±0.05mm
Insert placement
2.5%
Silicone shrinkage
1.5°
Minimum draft
Shrinkage Compensation
Silicone contracts up to 2.5% after curing. Mold cavities are pre-calculated to compensate, preserving final dimensions against rigid substrates.
Mechanical Locking
Undercuts, ribs, and through-holes on plastic substrates create geometric anchors -- enhancing bond safety even under stress.
Thermal Match
Coefficient of thermal expansion (CTE) is validated to prevent delamination during dishwasher or sterilization cycles.
06 -- Mold Engineering
Precision Tooling for Bonded Complexity.
Our in-house mold shop designs and machines two-shot, rotary, and shuttle-plate tooling optimized for silicone-plus-substrate production.
120+
Multi-material molds built annually
Two-Shot Molds
Single-cycle overmolding with rotary or index-plate designs for high-volume runs.
Insert Cavities
Precision-machined positioning jigs -- locate metal or plastic inserts within ±0.05mm.
Cold Runner Systems
LSR cold-runner nozzles eliminate waste and preserve material clarity for baby products.
Mold Flow Analysis
CAE simulation predicts fill patterns, weld lines, and pressure balance before steel is cut.
P20
Standard Steel
H13
Hardened Cavity
S136
Mirror Polish
1M+
Cycle Lifespan
07 -- Sample Validation
From First Sample to Confident Launch.
Every prototype passes a rigorous 5-stage validation loop -- physical assembly, functional performance, safety compliance, aging simulation, and consumer-use scenarios.
Assembly Fit
Verify snap, thread, and press-fit interfaces align cleanly with 100+ trial cycles.
Tensile & Peel
Bonded surfaces are pulled apart with force gauges to confirm minimum peel strength.
Function Test
Actual-use validation -- sucking, chewing, drop, dishwasher, and sterilization.
Safety Cert
FDA, LFGB, EN71, CPSIA -- third-party lab testing before mass production sign-off.
Client Approval
Sealed samples + inspection report signed off before tooling is unlocked for MP.
100%
Sample Inspection
15+ Reports
Per validation cycle
7 - 14 days
Sample lead time
08 -- Mass Production Control
Risk Anticipated. Consistency Delivered.
Multi-material production magnifies small errors. Our SOP-driven system controls variance at every checkpoint -- from incoming material to outbound container.
A
Incoming QC
Incoming QC
• Batch-level material certificates verified against FDA / LFGB reports
• Random hardness (Shore A) and viscosity checks
• Insert dimensional check with CMM before mold loading
B
In-Process
In-Process
• Hourly first-piece + last-piece inspection
• Real-time mold pressure & temperature monitoring
• SPC charts track dimensional drift across shifts
C
Final QC
Final QC
• 100% visual + functional inspection
• Peel-force sampling per batch (AQL 0.65)
• Pre-shipment inspection by 3rd-party (SGS, BV, TÜV)
D
Delamination Risk
Delamination Risk
• Automated peel-force test on 3 pcs per hour
• Immediate line stop on 2 consecutive failures
• Root-cause analysis with 8D report if defect > 0.3%
E
Color Consistency
Color Consistency
• Pantone-controlled masterbatch pre-mixed and refrigerated
• ΔE ≤ 1.5 between batches under standard light box
• Reference chips sealed & filed for 3 years
F
Traceability
Traceability
• Every carton labeled with lot code + shift ID
• Retained samples archived for 2 years
• Full digital records via MES system
Defect Rate
Below 0.3% on multi-material orders
09 -- Start Your Project
Submit Your Multi-Material Concept.
Share your design brief or reference sketches. Our engineering team responds within 24 hours with material recommendations, feasibility notes, and next-step planning.
Phone / WhatsApp
+86 134 1898 3587What we need to quote
- ✦ Product sketch or 3D file (STEP/STL)
- ✦ Material combination preference
- ✦ Target quantity per order
- ✦ Target markets & certifications