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1
Define the product brief before sampling
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Materials, construction, finish, size and target retail positioning
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The specification should identify frame material, surface treatment, lens width, bridge width, temple length, hinge type, color reference and packaging requirements. Each dimension should have a defined tolerance rather than an informal visual description.
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Compare the physical sample against a signed specification sheet and an approved color or finish reference. Record all deviations in a sample review log.
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Request a material declaration, component list, technical drawing and pre-production sample record. Documentation should use the same product code across all files.
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Approve one controlled specification as the master reference for quotations, samples and production.
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High |
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2
Inspect frame geometry and fit
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Dimensional accuracy, symmetry and wearer comfort
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As a practical incoming-quality target, key dimensions should remain within approximately ±0.5 mm of the approved drawing, unless the product specification states a different tolerance. Front symmetry, bridge alignment and temple positioning should be visually consistent.
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Measure the lens opening, bridge, temple length and overall front width with calibrated digital calipers. Place the frame on a flat surface to check rocking, twist and uneven temple contact.
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Provide a dimensional inspection report for pilot samples, including measuring equipment, inspection date and results for each critical dimension.
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Separate critical dimensions from cosmetic dimensions and include both in the purchase specification.
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High |
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3
Evaluate material and finish quality
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Surface uniformity, color consistency, plating or coating durability
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Surfaces should be free from visible pits, bubbles, sharp edges, sink marks, exposed base material and uneven polishing when viewed under consistent lighting. Color and gloss should match the approved reference across the frame, temples and accessories.
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Inspect under bright, diffused lighting from multiple angles. Use a soft cloth for a rubbing check and visually compare adjacent samples from the same production batch.
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Submit coating or plating specifications, process controls and, where applicable, test results for adhesion, abrasion and corrosion resistance.
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Establish defect photographs and a written cosmetic grading standard before bulk production.
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High |
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4
Test hinges, temples and moving parts
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Hinge alignment, opening resistance, screw security and repeated operation
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Both temples should open and close smoothly without grinding, lateral play or visible misalignment. Screws should sit flush where specified, and the frame should remain stable after repeated manual opening and closing.
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Operate each temple repeatedly at a controlled pace, check for looseness, inspect hinge barrels under magnification and verify that both sides show comparable resistance.
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Identify hinge and screw suppliers, define lubrication practices and provide a replacement-parts plan for approved components.
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Add hinge function and hardware security to the pre-shipment inspection checklist rather than relying only on visual inspection.
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High |
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5
Verify safety and regulatory documentation
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Chemical compliance, restricted substances and product traceability
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Materials and finishes should comply with the regulations of the intended sales markets. For metal components that contact skin, request applicable restricted-substance and nickel-release documentation where required by the destination market.
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Check that certificates match the exact material, coating, product code and production period. Do not accept unrelated laboratory reports as product-specific evidence.
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Request recent third-party test reports, declarations of conformity where applicable, material safety information and batch traceability records.
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Confirm compliance requirements before sampling so that unsuitable materials are not developed into production tooling.
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Critical |
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6
Validate packaging and delivery performance
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Protection, presentation, quantity accuracy and lead-time reliability
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Packaging should prevent lens scratching, frame deformation and moisture damage during normal handling. The supplier should provide a realistic production lead time, shipment quantity tolerance and corrective-action timeline.
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Conduct a basic drop or transit simulation appropriate to the packaging design, inspect inner protection and compare packed quantities with the packing list.
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Provide a packaging specification, carton dimensions, packing photographs, production schedule and historical on-time-delivery records without disclosing confidential customer information.
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Agree on milestone dates for sample approval, material ordering, production completion, inspection and shipment.
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Medium |
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7
Build a transparent corrective-action partnership
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Communication, root-cause analysis, consistency and continuous improvement
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A reliable supplier should acknowledge quality issues promptly, identify the root cause, define containment steps and provide a dated corrective-action plan. Repeated defects should trigger process changes rather than repeated sorting alone.
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Run a pilot order and record defect types, response time, replacement rate and closure date. Review whether corrective actions remain effective in the next production batch.
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Use a shared quality agreement covering acceptance criteria, inspection rights, sample retention, change notification, rework approval and traceability.
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Schedule regular performance reviews using measurable indicators such as defect rate, response time and on-time delivery.
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Critical |
