Polarized sunglasses

When evaluating polarized sunglasses, prioritize TAC (Triacetate Cellulose) or PC (Polycarbonate) lenses for impact resistance. Ensure the Polarization Efficiency is ≥99% to effectively eliminate glare. For frame materials, TR90 (Thermoplastic) is preferred for its lightweight and flexible properties, while Acetate is ideal for high-end fashion durability. Always verify the UV400 protection rating, which ensures the lenses block 100% of UVA and UVB rays.

For the US market, products must comply with FDA 21 CFR 801.410 (Drop Ball Test) for impact resistance and ANSI Z80.3. For the European Union, CE Marking is mandatory, ensuring adherence to EN ISO 12312-1. If you are targeting the Australian market, ensure compliance with AS/NZS 1067. Failure to provide these certifications can lead to customs seizures or legal liabilities.

Request a Polarization Test Card or a digital tester report from the supplier. For coatings, ask for the Salt Spray Test results (typically 48-96 hours) to ensure the mirror or anti-reflective coatings do not peel in humid or coastal environments. Additionally, check for Hard Coating (Anti-scratch) levels, ideally reaching a 3H-5H hardness rating to extend product lifespan.

For Fishing/Marine use, prioritize hydrophobic coatings and blue/green mirrored lenses to enhance contrast on water. For Driving, copper or grey lenses are best for color neutrality. For Sports/Cycling, look for wraparound designs with rubberized nose pads and temple tips (hydrophilic rubber) to ensure the glasses stay secure during perspiration.

The most significant risks include Intellectual Property (IP) infringement (copying brand logos or patented frame designs) and substandard lens quality where non-polarized lenses are labeled as polarized. To mitigate this, use Made-in-China.com's Secured Trading services and request pre-shipment inspections (PSI) to verify the polarization of a random sample from the bulk lot.

Standard MOQs for custom colors are usually 300-500 pieces per style. To reduce initial risk, negotiate a 'Trial Order' of 100 pieces using the supplier's stock frames but with your laser-etched logo. For bulk orders, aim for a 15-20% price reduction when volume exceeds 2,000 units, and always clarify if the price includes packaging (hard cases, microfiber pouches, and cleaning cloths).

Sunglasses are high-value but lightweight. For volumes under 500 units, Air Express (DHL/FedEx/UPS) is most efficient for speed and safety. For larger sea freight shipments, ensure the supplier uses double-walled corrugated export cartons and internal dividers to prevent frame deformation or lens crushing during stacking. Always specify FOB (Free On Board) terms to maintain control over your shipping costs and choice of forwarder.

Avoid direct wire transfers to unknown accounts. Utilize Escrow-based payment systems provided by reputable platforms like Made-in-China.com, which hold funds until you confirm receipt of goods. Ensure the Proforma Invoice (PI) clearly states the technical specs, lead time, and refund policy for defective items (typically a 1-3% defect allowance is standard in eyewear).