Customized Processing of Liquid Silicone Coated Metal Parts | Precision Solutions for Industrial Applications
Eliminate corrosion, wear, and electrical hazards with our liquid silicone overmolded metal parts. Trusted by automotive, electronics, and medical device manufacturers for durability, insulation, and precision.
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3 Critical Problems Your Metal Parts Face (And How Silicone Solves Them)
⚡ 1. Corrosion & Environmental Degradation
Metal parts in automotive, marine, or industrial environments face constant exposure to moisture, chemicals, and temperature extremes. Standard coatings (paint, powder) chip or degrade, leading to rust, electrical failures, and structural weakness.
Result: 40% higher maintenance costs and premature part replacement (Source: Grand View Research, 2025).
🔌 2. Electrical Insulation Failures
Uncoated metal components in electronics or electrical systems risk short circuits, arcing, or signal interference. Traditional insulation methods (heat-shrink tubing, epoxy) are bulky, labor-intensive, and prone to delamination.
Result: Product recalls due to electrical hazards (e.g., CPSC’s 2024 report on faulty connectors).
🛠️ 3. Wear & Vibration Damage
Moving metal parts in machinery or vehicles suffer from friction, vibration, and impact. Hard coatings (Cerakote, anodizing) crack under stress, while soft coatings (rubber) lack durability.
Result: Reduced operational lifespan by 30-50% (Source: Research Nester, 2025).
"Standard coatings fail where liquid silicone overmolding excels: permanent bonding, flexibility, and resistance to extreme conditions."
Liquid Silicone Coated Metal Parts: The Ultimate Protection Solution
At Guangdong Yingtai High Precision Technology Co., Ltd., we combine 20+ years of LSR expertise with precision metal fabrication to deliver custom silicone-coated parts that outperform traditional methods in durability, insulation, and cost-efficiency.
🔍 Why Liquid Silicone Overmolding Beats Alternatives
| Feature | Liquid Silicone Coating | Plastic Coating (PVC/PE) | Rubber Coating (EPDM) | Powder Coating |
|---|---|---|---|---|
| Bonding Strength | ✅ Chemical bond (no delamination) | ❌ Mechanical only (peels over time) | ⚠️ Adhesive required | ⚠️ Chips under impact |
| Temperature Range | ✅ -60°C to 250°C | ❌ -20°C to 80°C | ⚠️ -40°C to 120°C | ⚠️ Up to 200°C (but brittle) |
| Chemical Resistance | ✅ Excellent (acids, solvents, UV) | ❌ Poor (degrades in oils/solvents) | ⚠️ Good (but swells in oils) | ⚠️ Limited |
| Electrical Insulation | ✅ Dielectric strength: 20-25 kV/mm | ⚠️ 10-15 kV/mm | ⚠️ 12-18 kV/mm | ❌ Conductive if damaged |
| Flexibility | ✅ Shore A 10-80 (customizable) | ❌ Rigid | ⚠️ Shore A 40-90 | ❌ Brittle |
| Cost Efficiency | ✅ Low waste, high-volume scalability | ❌ High material/processing costs | ⚠️ Moderate | ⚠️ High for complex parts |
Data source: Protolabs LSR Guide (2025)
Yingtai’s 35,000 m² facility with 55 LSR molding machines and 20+ testing instruments.
🏆 Our Core Advantages
- 🔬 Material Science Expertise: Proprietary silicone formulations with enhanced adhesion to metals (aluminum, steel, copper, brass). (MDPI Study, 2025)
- 🎯 Precision Overmolding: Tolerances down to ±0.01mm for complex geometries (e.g., threaded inserts, heat sinks).
- ⚡ One-Stop Service: From metal CNC machining → surface treatment → LSR overmolding → testing under one roof.
- 🚀 Fast Turnaround: Prototypes in 7-10 days, mass production in 3-4 weeks.
- 🌍 Global Compliance: Meets UL, FDA, RoHS, REACH, and ISO 10993 (biocompatibility) standards.
📊 Technical Specifications
| Parameter | Capability |
|---|---|
| Metal Substrates | Aluminum, Steel, Stainless Steel, Copper, Brass, Titanium |
| Silicone Hardness | Shore A 10 to 80 (customizable) |
| Coating Thickness | 0.5mm to 10mm (uniform ±0.1mm) |
| Temperature Resistance | -60°C to 250°C (short-term up to 300°C) |
| Dielectric Strength | 20-25 kV/mm (UL 94 V-0 rated) |
| Tensile Strength | 6-12 MPa (reinforced grades available) |
| Bonding Strength | ≥3 MPa (peel test, no primer needed) |
| Volume Capacity | 1,000 to 1,000,000+ parts/year |
🔧 Application Scenarios
🚗 Automotive
- Battery connectors: Insulation for EV high-voltage systems.
- Sensor housings: Protection against vibration and moisture.
- Heat sinks: Thermal management with electrical isolation.
Case Study: Supplied 500,000+ coated aluminum heat sinks to a Tier 1 EV manufacturer, reducing thermal resistance by 35%.
💻 Electronics
- PCB shields: EMI/RFI shielding with silicone overmolded frames.
- Connector gaskets: Waterproof IP67-rated seals.
- Wearable tech: Soft-touch buttons and encapsulations.
Case Study: 99.8% yield rate for silicone-coated stainless steel RFID tags used in harsh environments.
⚕️ Medical Devices
- Surgical tools: Non-slip, sterile silicone handles.
- Implantable components: Biocompatible (ISO 10993) coated titanium parts.
- Diagnostic equipment: Chemical-resistant coatings for probes.
Case Study: FDA-approved silicone-coated stainless steel lap tools for a leading medical OEM.
Trusted by Industry Leaders | Certified for Global Markets
🏢 Our Clients
📜 Certifications & Compliance
ISO 9001:2015
CE Marking
FDA 21 CFR
RoHS/REACH
UL 94 V-0
💬 Customer Testimonials
"Yingtai’s silicone-coated aluminum battery connectors exceeded our durability tests in extreme temperatures (-40°C to 150°C). The chemical bond between silicone and metal eliminated delamination issues we faced with previous suppliers. Their 3-week lead time for 50K units was a game-changer."
"We needed UL-certified silicone coatings for our industrial sensors. Yingtai provided custom Shore A 50 silicone with 25 kV/mm dielectric strength, passing all our electrical insulation tests. Their in-house metal machining ensured perfect fitment."
"For our FDA Class II medical device, we required biocompatible silicone (ISO 10993) bonded to titanium. Yingtai’s cleanroom molding and 100% inspection gave us the confidence to scale production. Zero defects in 20K+ units."
💬 Real Conversations with Our Team
Frequently Asked Questions (FAQ)
✅ All common industrial metals: Aluminum (most popular for lightweight applications), steel, stainless steel, copper, brass, and titanium. We also work with plated metals (e.g., nickel-plated steel) for enhanced adhesion.
✅ Through a two-step process:
- Surface Treatment: Metal parts are cleaned, degreased, and often primed or plasma-treated to activate the surface.
- Overmolding: Liquid silicone is injected onto the pre-heated metal (typically 80-120°C), creating a molecular bond as it cures. No adhesives are needed for most applications.
✅ No strict MOQ for prototypes (1-100 pieces). For mass production, we recommend:
- Small batches: 1,000+ pieces (ideal for testing).
- Economies of scale: 10,000+ pieces (best pricing).
✅ Multi-stage quality control:
- Incoming Material Inspection: Verify metal and silicone raw materials meet specs.
- In-Process Checks: Real-time monitoring of temperature, pressure, and curing.
- Post-Molding Tests: 100% visual inspection + random peel tests, dielectric tests, and salt spray tests (per ASTM B117).
- Final Validation: Dimensional checks using CMM (Coordinate Measuring Machine).
✅ Yes! We offer:
- Color Matching: Pantone or RAL colors (matt/glossy finishes).
- Textures: Smooth, grained, or custom textures (e.g., for grip).
- Special Effects: Translucent, fluorescent, or metallic-looking silicones.
✅ Fastest in the industry:
- Prototypes: 7-10 days (with existing tooling).
- New Tooling: 3-4 weeks (design to first sample).
- Mass Production: 3-4 weeks after tooling approval.
✅ Full-service engineering team:
- DFM (Design for Manufacturability): Optimize your part for silicone overmolding (e.g., radii, draft angles).
- Material Selection: Recommend the best silicone grade for your application.
- Prototyping: 3D-printed samples for form/fit testing.
✅ Flexible terms:
- Payment: 30% deposit + 70% before shipment (TT, L/C, PayPal).
- Shipping: Air freight (3-7 days), sea freight (20-45 days), or express (DHL/FedEx).
- Incoterms: EXW, FOB, CIF, or DDP.
Real User Reviews
"We switched from PVD coating to Yingtai’s liquid silicone overmolding for our aluminum battery busbars. The difference is night and day: no corrosion after 1,000 hours of salt spray testing (vs. 200 hours for PVD). The silicone also provided vibration damping, reducing NVH issues in our EVs."
"Yingtai helped us redesign a stainless steel surgical tool handle with a soft-touch silicone grip. Their team suggested a dual-shot molding approach that cut assembly time by 60%. The biocompatible silicone passed all our ISO 10993 tests, and the bond to metal has held up after 500+ autoclave cycles."
"We needed a cost-effective alternative to PEEK coatings for our copper electrical connectors. Yingtai’s LSR overmolding delivered 90% of the performance at 40% of the cost. Their automated production line ensured consistency across 200K+ parts/year with zero defects in our last 12 months of orders."
Ready to Upgrade Your Metal Parts?
Join 200+ global manufacturers who trust Yingtai for durable, high-performance silicone-coated metal parts.
✅ Free Samples | ✅ 24h Quote | ✅ DFM Support | ✅ No MOQ for Prototypes
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Daniel Carter
Senior Materials Engineer | 15+ Years in LSR Overmolding
Daniel Carter is a silicone materials specialist with a Ph.D. in Polymer Science from MIT. He has led R&D at Dow Corning and Wacker Chemie, specializing in liquid silicone rubber (LSR) adhesion to metals. At Yingtai, he oversees material selection, process optimization, and quality control for customized silicone-coated parts. His work has been published in MDPI Polymers and ScienceDirect.
