# Food-grade Kitchen Utensil Liquid Silicone Overmolding Parts
Product Overview
Our Food-grade Kitchen Utensil Liquid Silicone Overmolding Parts are high-performance, food-contact safe components designed to bond liquid silicone rubber (LSR) seamlessly to rigid substrates including stainless steel, aluminum alloy, food-grade polypropylene (PP), and glass fiber-reinforced nylon (PA) for kitchen utensil manufacturing. These overmolding parts combine the non-slip, heat-resistant properties of LSR with the structural rigidity of base substrates, eliminating delamination, warping, and material degradation common in low-quality bonded utensil components.
Core selling points include 100% compliance with global food contact regulations, up to 250°C (482°F) continuous heat resistance, a 5x longer service life than traditional PVC or TPE coated utensils, and customizability for complex geometric shapes including ergonomic handles, non-stick spatula heads, and heat-insulated pot grips. Our precision injection overmolding process ensures consistent bond strength of ≥3.5 N/mm between LSR and substrates, with zero adhesive additives required to avoid chemical leaching into food.
Technical Specifications
Material Properties
All overmolding parts use food-grade liquid silicone rubber formulated with platinum-catalyzed curing systems, free of bisphenol A (BPA), phthalates, polyvinyl chloride (PVC), and per- and polyfluoroalkyl substances (PFAS).
ParameterStandard ValueTest Method
Food Contact ComplianceMeets FDA 21 CFR Part 177.2600, EU Regulation 10/2011, GB 4806.11-2021Third-party food contact migration testing
Silicone Purity≥99.5% volatile content (post-cure) <0.1%ASTM D4574
Substrate CompatibilityStainless steel 304/316, food-grade PP, PA66, aluminum 5052Peel strength testing per ASTM D903
Chemical ResistanceNo degradation after 1000 hours of contact with cooking oil, vinegar, citrus juice, dish soap, and 10% sodium hypochlorite solutionISO 175:2010
Physical Performance
The overmolded LSR layer delivers consistent performance across extreme kitchen operating conditions:
ParameterStandard ValueTest Method
Hardness Range30 Shore A to 80 Shore AASTM D2240
Tensile Strength≥7.5 MPaASTM D412
Elongation at Break≥500%ASTM D412
Tear Strength≥25 kN/mASTM D624
Continuous Operating Temperature Range-40°C to 230°C (-40°F to 446°F), short-term up to 250°C (482°F) for 1 hourUL 746B
Thermal Insulation Performance1.5mm LSR layer reduces surface temperature of 200°C metal substrate to ≤45°C on the outer contact surfaceASTM C177
Abrasion Resistance≤0.05 g weight loss after 10,000 cycles of 5N friction testing on dish rack surfacesASTM D4060
Color FastnessNo discoloration or transfer after 100 hours of UV exposure and 50 high-temperature dishwashing cyclesAATCC 61-2010 Test 2A
Process Parameters
Our high-precision LSR injection overmolding process ensures consistent part quality for mass production:
ParameterSpecification
Minimum Overmolding Thickness0.8mm for flat surfaces, 1.2mm for curved ergonomic structures
Dimensional Tolerance±0.03mm for parts ≤50mm, ±0.08mm for parts 50mm-200mm
Maximum Part Size350mm x 250mm x 100mm, compatible with most full-size kitchen utensil designs
Molding Cycle Time45s to 90s per part, depending on LSR layer thickness and part complexity
Post-Curing Requirement4 hours at 120°C for food-grade applications to remove residual volatile compounds
Bond Strength≥3.5 N/mm for metal substrates, ≥2.8 N/mm for plastic substrates, no delamination after 1000 thermal shock cycles (-20°C to 200°C)
Product Advantages
1. Zero Leaching Food Contact Safety
Unlike TPE or PVC coated utensils that rely on adhesive layers and release harmful plasticizers during high-temperature cooking, our overmolding parts use a molecular bonding process between LSR and substrates with no added adhesives. The platinum-cured LSR formula meets the strictest global food contact standards, with no detectable migration of harmful substances even after 200 hours of contact with hot oil at 200°C.
2. Superior Long-Term Durability
The high tear strength and abrasion resistance of our overmolded LSR layer delivers a service life of ≥5 years under regular household use, 5x longer than TPE coatings that typically crack or peel after 12 months of frequent dishwashing and high-temperature exposure. Parts pass 1500 cycles of dishwasher testing (65°C, alkaline detergent) without discoloration, delamination, or surface wear.
3. Enhanced Ergonomic and Functional Performance
The low thermal conductivity of LSR creates a safe heat-insulated layer that prevents scalding even when holding utensils exposed to 200°C cooking surfaces for 30 seconds. The customizable Shore A hardness range allows for non-slip, soft-touch handles (30-40 Shore A) for comfortable grip even with wet hands, and rigid, scratch-resistant spatula heads (60-70 Shore A) that are safe for non-stick cookware without scratching coating surfaces.
4. Low-Cost Mass Manufacturing Compatibility
Our automated LSR overmolding process eliminates secondary assembly steps, reducing production costs by 20-30% compared to manually assembled utensil components. The high-precision mold design ensures consistent part quality with a ≤0.1% defect rate for mass production runs of 100,000+ parts, making it suitable for both small-batch custom utensil lines and large-scale consumer product manufacturing.
Applications
Our food-grade LSR overmolding parts are widely used across the kitchen utensil industry for the following use cases:
- Cutlery and Handheld Utensils: Overmolded handles for stainless steel spatulas, slotted turners, soup ladles, tongs, and whisks, providing non-slip grip and heat insulation for high-temperature cooking applications.
- Bakeware Components: Heat-resistant overmolded edges for glass baking dishes, silicone-bound stainless steel cookie cutters, and ergonomic handles for baking sheets, withstanding regular oven use up to 230°C.
- Cookware Accessories: Non-scratch overmolded pot and pan handle grips, lid knob covers, and silicone-edged food scrapers that are safe for non-stick PTFE and ceramic cookware surfaces.
- Food Preparation Tools: Overmolded cutting board non-slip base pads, vegetable peeler handles, and meat thermometer probe grips, with resistance to frequent washing and contact with acidic and oily food ingredients.
- Baby Feeding Utensils: Soft, BPA-free overmolded spoon heads and toddler cutlery handles with 30-40 Shore A hardness to prevent gum damage, meeting additional child product safety regulations including EN 14372.
Selection Guide
Hardness Selection
- 30-40 Shore A: Recommended for soft-touch handles, baby utensil heads, and non-slip base pads, where maximum grip and softness are prioritized. This hardness range provides a comfortable, non-slip surface even with wet or oily hands.
- 50-60 Shore A: Ideal for general-purpose spatula heads, pot handle grips, and bakeware edges, balancing flexibility and structural rigidity to avoid bending during heavy use.
- 70-80 Shore A: Suitable for rigid scraper blades, heavy-duty utensil handles, and scratch-resistant cookware edges, where high structural stiffness and abrasion resistance are required.
Size Specifications
We offer both standard and custom size options:
- Standard overmolded handle blanks are available in 100mm, 150mm, and 200mm lengths compatible with most common utensil designs, with minimum order quantities (MOQ) of 10,000 parts per size.
- Custom sizes and geometric shapes (including ergonomic curved handles, contoured spatula heads, and custom logo embossing) are available with MOQ of 5,000 parts, with free mold design support for orders over 20,000 parts.
- For parts with complex undercuts or fine surface details, we recommend providing 3D CAD files (STEP or IGES format) for preliminary mold feasibility assessment within 24 hours.
Material Grade
- Standard Food Grade: Meets FDA and EU 10/2011 regulations, suitable for most household kitchen utensil applications with regular use up to 220°C.
- High-Temperature Grade: Formulated for commercial kitchen and bakeware applications, with continuous operating temperature up to 250°C and enhanced resistance to grease and commercial cleaning chemicals.
- Antibacterial Grade: Infused with food-safe silver ion additives that deliver 99.9% antibacterial efficacy against *E. coli* and *S. aureus*, recommended for baby feeding utensils and commercial food preparation tools.
Quality Assurance
We implement a strict end-to-end quality control process to ensure consistent part performance and safety:
- Incoming Material Inspection: All LSR raw materials and substrates are tested for food contact compliance and purity before production, with batch traceability records maintained for 5 years.
- In-Process Quality Control: 100% dimensional inspection of every 50th part during production, with hourly peel strength testing to verify bond integrity between LSR and substrates.
- Final Product Testing: Every production batch undergoes random sampling for food contact migration testing, 100-cycle dishwasher testing, and thermal shock testing to ensure compliance with performance specifications.
- Certifications: All parts are certified by third-party laboratories including SGS and Intertek, with full documentation of FDA, EU 10/2011, GB 4806, and LFGB compliance available for every batch.
- Warranty: We offer a 2-year quality warranty for all overmolding parts, with free replacement for any parts with manufacturing defects including delamination, discoloration, or dimensional non-conformity under normal use conditions.
