A deposit changes the project. Materials may be ordered, molds may enter development, and production capacity may be reserved. Reversing those steps is difficult.
A polished website, clean sample, or fast quotation does not prove that bulk production will match the approved product. The real test is whether an OEM sunglasses manufacturer can define specifications, provide evidence, accept inspection rules, and explain what happens when production goes wrong.
These ten questions expose the gaps before money moves.
Ask who controls molding, injection, acetate processing, metal work, lens fitting, coating, assembly, and packaging. Some factories outsource selected processes. That is normal. Hidden outsourcing is the problem.
A trading company can still be a capable OEM sunglasses supplier, but responsibility must be visible. Who approves materials? Who investigates defects? Who pays when an outsourced coating batch fails?
Request the legal company name, production address, factory proof, and a list of outsourced operations.
“Customization” may mean a logo printed on an existing temple. It may also mean a new frame developed from drawings and tooling. Those are not comparable projects.
Confirm whether the quotation covers an existing style with a custom logo, a standard frame with new colors and lenses, a modified design based on an existing mold, or a fully customized frame requiring prototypes and new tooling.
This affects cost, ownership, lead time, MOQ, and revision risk.
A price has little value without a specification behind it.
The quotation should identify frame and lens materials, lens color, UV protection, polarization, hinges, coatings, logo method, packaging, accessories, testing, inspection, shipping terms, and the number of colors included.
Two acetate frames can carry nearly the same price. One uses a stock lens and basic hinge; the other includes a polarized lens and custom case. The products are not equivalent.
Compare recommended sunglasses manufacturers only after each supplier quotes the same specification.
Clarify what sample will be supplied. A stock sample checks general construction. A logo sample checks branding. A functional sample may confirm polarization. A fully customized sample should represent the intended bulk product.
Confirm fees, revision limits, and timing. The approved version should become a signed “golden sample.”
The purchase order should state that materials, colors, lenses, hinges, and accessories cannot be changed without written approval. “Equivalent material” sounds harmless. Sometimes it changes fit, color stability, or breakage rates.
A single MOQ number is rarely useful.
Ask for MOQ per frame model, per color, per lens option, for custom packaging, and for repeat orders. A sunglasses factory China buyers find online may advertise a low MOQ that applies only to ready stock frames.
MOQ should follow customization depth. Stock logo orders and new mold orders are different purchasing decisions. Packaging may add another threshold because cases, cloths, boxes, and sleeves have separate minimums.
“We have strict QC” is not an inspection standard.
The purchase order should define defect classes, the sampling method, acceptable limits, and rejection conditions. Checks may include frame alignment, hinge movement, lens scratches, logo position, color consistency, and packaging accuracy.
A warning sign appears when a supplier resists measurable criteria but keeps saying “no problem.” Every process creates variation. The serious factory explains how variation is detected and contained.
A certificate is useful only when it matches the purchased product and target market.
Tell the supplier the destination country and intended use. Request reports covering the relevant frame material, lens type, lens color, coating, and product family. One report for a black non-polarized sample may not cover every mirrored or polarized version.
Check the report holder, model reference, test date, laboratory, and standard. The key question remains: does this report apply to this model?
Break the schedule into final drawing approval, sample approval, material purchasing, tooling, mass production, packaging, final inspection, and export preparation.
This reveals the critical path. A custom case may finish later than the sunglasses. A lens color may need another approval round. A mold correction can shift the whole schedule.
Ask for target dates and dependencies, not one optimistic shipping date. The answer should explain what pauses the clock, such as late artwork or a specification change.
The contracting company, invoice issuer, and receiving account should match. Any difference needs a written explanation.
The agreement should state what the deposit starts and what happens if a sample fails, material becomes unavailable, or the order is cancelled. Extra costs should appear separately.
The lowest deposit percentage is not always the safest offer. Clear milestones matter more. Linking the balance to final inspection or shipment approval creates a practical control point.
Problems need a process before they happen.
Define tolerances, rework conditions, replacement quantities, reinspection costs, delay handling, and the claim period after delivery. Repeated defects should trigger a corrective action report, not another informal promise.
A reliable manufacturer can describe the ideal workflow. A dependable one will also document the recovery plan when that workflow breaks.
Compare evidence, not presentation.
| Evaluation Area | Evidence to Request | Warning Sign |
| Manufacturing identity | Business details and factory proof | Unclear production location |
| Product specification | Itemized quotation | Price without specifications |
| Sample approval | Signed golden sample | Production before approval |
| Quality control | Written inspection criteria | Only verbal QC promises |
| Payment protection | Contract and milestone terms | Pressure to pay immediately |
The cheapest quotation often becomes expensive after sample revisions, packaging changes, failed inspection, or air freight caused by delay.
A supplier is ready when the product specification and final sample are approved, the MOQ and full cost are written down, and the schedule has clear milestones. QC rules, applicable compliance documents, payment terms, and problem handling responsibilities should also be settled.
Before paying a deposit, request an itemized quotation, sample schedule, QC checklist, and model specific compliance documents. 수슨 supports OEM/ODM sunglasses and optical eyewear projects and can prepare a production proposal around the design, customization level, target market, and order volume.
The percentage varies. More important is what the deposit funds, whether tooling and materials are separated, and what happens after cancellation, material failure, or an unapproved sample.
The previous golden sample may remain the reference. A new sample is sensible when color, lens, logo, material, packaging, or production process changes.
Possibly, but low MOQ claims often refer to stock frames or logo customization. New molds, exclusive colors, custom lenses, and packaging usually create higher minimums.
Request the itemized quotation, final specification, approved sample record, production schedule, QC criteria, applicable compliance reports, payment terms, and written responsibility for delays or failed inspection.
