Metal frames provide a defined profile for sport-inspired and contemporary sunglass collections. Frame shape, bridge construction, temple design and overall dimensions influence the appearance, fit and intended use of each model.

Structural & Material Specifications

Specification Dimension	Factory Standard / Options to Confirm	Procurement Impact & Verification Guide
Frame Alloy	Copper-nickel alloy, Monel, or Stainless steel (Confirm by SKU)	Dictates frame weight, memory flex, and structural resilience.
Surface Treatment	Vacuum IP Plating, Aqueous Plating, or Protective Enamel Coating	Controls colorfastness, skin compatibility, and sweat-corrosion resistance.
Hinge Assembly	3-barrel, 5-barrel, or Integrated Spring Hinges	Governs temple tension retention and mechanical life-cycle wear.
Nose Pads & Tips	Adjustable medical-grade silicone pads or injected temple tips	Affects weight distribution, anti-slip stability during active wear, and comfort.
Lens Materials	TAC (Triacetate Cellulose) / Polycarbonate (PC)	PC provides superior impact resistance; TAC ensures high-clarity polarization.
UV Compliance	UV400 Protection (Blocks 100% UVA/UVB up to 400nm)	Must be verified via batch-specific laboratory test reports.

Product Features

UV Protection Verification: Lenses are tested to ensure 100% absorption of ultraviolet radiation up to 400nm (UV400 compliance), confirming protection against both UVA and UVB rays.

Polarization Efficiency: Polarized variants undergo axis alignment and glare-reduction checks to maintain horizontal light filtration consistency across production batches.

Impact Resistance: Sample units are subjected to drop-ball testing according to designated optical safety standards to evaluate lens fracture limits under sudden mechanical stress.

Hinge Durability & Torque Testing: Temples undergo mechanical cycle testing to measure hinge spring-back memory, screw retention stability, and resistance to loosening over extended operational lifecycles.

Applications, Market Positioning & Technical Boundaries

Target Market Segments: Travel retail, holiday accessories, contemporary streetwear, driving gear, and corporate promotional programs.

Technical Boundary: Frames in this series feature sport-inspired aesthetics and ergonomic metal profiles. They are engineered for lifestyle, driving, and general outdoor recreation. Unless explicitly tested and certified with specialized retention straps and impact ratings, standard fashion-metal frames should not be marketed as certified personal protective equipment (PPE) or high-impact athletic gear.

Corrosion Resistance: Standard plating handles normal perspiration and ambient humidity. For marine or high-perspiration retail lines, request upgraded salt-spray test verification (e.g., ASTM B117) prior to order finalization.

OEM/ODM Customization & Private Label Capabilities

Laser engraving (precise, clean, permanent on metal temples).

Silk-screen printing or metal badge embedding (subject to surface flatness).

Requirement: Supply vector art (.AI/.EPS) with Pantone (PMS) references.

Color & Finish Customization: Custom plating finishes (gunmetal, matte black, shiny gold, silver, rose gold) and gradient lens tints.

Packaging Integration: Bulk polybagging or custom full-retail sets including branded hard cases, microfiber cloths, and custom outer boxes.

Quality Control and Inspection Standards

Rigorous quality control protocols are implemented across every stage of manufacturing to ensure batch consistency and compliance with international export requirements.

Incoming Material Inspection: Raw metal alloys, spring hinges, nose pads, and lens blanks are inspected for compositional accuracy, surface defects, and dimensional tolerance before entering production lines.

In-Process Monitoring: Technicians monitor stamping, welding, polishing, and plating stages in real time to verify frame symmetry, bridge alignment, and coating adhesion thickness.

Finished Product Auditing: Completed sunglasses undergo a 100% visual and functional inspection under standardized lighting to detect scratches, plating blemishes, uneven lens tints, and asymmetrical temple opening actions.

Acceptance Criteria & Documentation: Final inspections follow established Acceptable Quality Limit sampling standards, with inspection reports generated and archived for customer review prior to shipment authorization.

Packaging & Logistics Specifications

Protecting delicate eyewear frames during international transit:

Inner Layer: Individual PE polybags or protective sleeves to prevent lens/frame scratching.

Intermediate Layer: Custom hard cases or rigid pouches packed in secure compartmentalized inner boxes.

Outer Master Carton: Heavy-duty 5-layer corrugated export cartons designed to withstand long-haul ocean or air freight, secured with edge protectors and strapping bands.

FAQ

Q: What are the typical payment terms for custom orders?

A: Standard export terms are 30% T/T deposit upon order confirmation, with the 70% balance paid against copy of the Bill of Lading (B/L) or inspection sign-off. Specific terms can be reviewed for long-term partners.

Q: How are color variances prevented across repeat bulk productions?

A: Physically signed golden samples and strict Pantone color matching are utilized for all plating and lens tints, ensuring every batch matches the initial approval.

Q: Can third-party lab testing (e.g., CE, FDA, Drop-ball) be requested?

A: Yes. Testing can be coordinated with recognized laboratories (such as SGS or Intertek) based on destination market requirements. Testing costs are discussed during project scoping.

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