Metal sunglass

Buyers should prioritize Monel, Stainless Steel, or Titanium frames. Titanium is the premium choice due to its hypoallergenic properties, extreme lightweight, and corrosion resistance. For mid-range markets, 304 or 316L Stainless Steel offers excellent durability and flexibility. Ensure the plating uses IP (Ion Plating) technology rather than simple water electroplating to prevent color fading and skin irritation over long-term wear.

All lenses must provide 100% UV400 protection, filtering out UVA and UVB rays. For the US market, compliance with FDA 21 CFR 801.410 (Drop Ball Test) is mandatory to ensure impact resistance. For the EU, CE marking and adherence to EN ISO 12312-1 are required. Additionally, consider TAC polarized lenses for high-glare environments to improve visual clarity and reduce eye strain.

Focus on the hinge construction; OBE or Comotec hinges are industry benchmarks for longevity. Request salt spray test reports (typically 48 to 96 hours) to verify the frame's resistance to sweat and humidity. Check for silicone nose pads rather than PVC for better comfort and to avoid yellowing. The spring hinges should be tested for at least 20,000 opening/closing cycles to ensure mechanical reliability.

Professional suppliers on Made-in-China.com usually offer laser engraving for logos on the temples or lenses. Discuss MOQ for custom colors, which typically ranges from 300 to 500 pieces per model. Inquire about private label packaging, including microfiber pouches, hard cases, and branded cleaning cloths, to enhance the perceived value of the product.

The biggest risk is regulatory seizure due to lack of medical device registration (in the US, sunglasses are Class I medical devices). Always verify that your supplier is FDA registered and has a Medical Device Listing. To mitigate quality risks, utilize third-party inspections (like SGS or TUV) before final payment to check for scratches, alignment issues, and lens thickness consistency.

Focus on tiered pricing based on volume; for metal frames, a jump from 500 to 2,000 units can often reduce the unit cost by 15-20%. Negotiate for spare parts (screws, nose pads, extra lenses) to be included at no cost (usually 1-3% of the order volume). For payment, use Secure Trading services on Made-in-China.com to ensure funds are only released after proof of shipment.

Sunglasses are high-value but fragile. Avoid sea freight for small batches due to the risk of crushing in consolidated containers. Air express (DHL/FedEx/UPS) is preferred for high-end titanium models to ensure fast turnover. Ensure the supplier uses double-walled corrugated outer cartons and that each unit is protected by a polybag and an individual inner box to prevent frame deformation during transit.