Private Label Glass Olive Oil Bottles: A Sourcing Checklist for EVOO Brands

Written confirmation that glass formulations comply with 21 CFR requirements for food-contact materials, including heavy metal migration limits (lead, cadmium). Ask for the specific CFR reference the supplier cites.

A manufacturer’s total capacity relative to your order volume determines how much scheduling priority your orders will receive. A manufacturer with nine furnaces and 250,000 tonnes annual capacity treats your 50,000-unit order differently than one with a single furnace and no spare capacity.

Confirm the MOQ for the specific format and specification you are considering — not a general range. MOQ varies by format, surface treatment, and whether the shape is catalog or custom. MOQ varies significantly between manufacturers, format type, and whether the order can be consolidated with other production runs. For catalog formats, many manufacturers offer lower entry points when orders are consolidated; confirm the specific MOQ for your format and specification directly, rather than assuming a single industry-wide figure.

Confirm the manufacturer has direct export experience to your target market, including familiarity with the documentation requirements (commercial invoice, packing list, certificate of origin, food safety documentation) for your import port. Manufacturers with dedicated export QC teams handle documentation requirements more reliably than those treating exports as an occasional secondary activity.

Colour name (dark green, amber, clear) plus the actual UV transmission percentage at 320–400nm for the specific formulation at the specified wall thickness. “Dark green” is not a specification; “dark green, maximum 35% UV transmitted at 320–400nm at 3mm wall thickness” is.

For catalog formats: the manufacturer’s standard technical drawing for the specific format and size (Marasca 500ml, Dorica 250ml, etc.) with all dimensions confirmed in millimetres. For custom formats: your approved technical drawing confirmed by the manufacturer as producible.

Standard wall or heavy wall specified explicitly, with the unit weight in grams confirmed by the manufacturer. Use this figure to calculate landed cost per unit before finalising the order.

The finish standard (18/400, 28/400, cork-fit GPI size) confirmed in writing, and the specific closure or pourer you intend to use confirmed as compatible with that finish. If using a non-drip pourer, confirm the pourer part number and fit validation against the specific manufacturer’s neck dimensions.

Standard (untreated), frosted (full or partial — specify label panel dimensions if partial), silk screen (artwork provided in vector format, Pantone colours specified), or embossing (technical drawing required). Surface treatment affects label adhesion and needs to be confirmed before label design is finalised.

The acceptable colour variation range between production runs, expressed as a measurable tolerance (Delta E value or equivalent). For brands placing repeat orders over time, uncontrolled colour drift between runs creates visible shelf inconsistency.

Written confirmation of who owns the mold, where it is stored, what the storage terms are, whether you have exclusivity on the shape, and what happens to the mold if the commercial relationship ends. These terms are negotiable — get them in writing before mold investment is made.

Measure height, body diameter, shoulder dimensions, neck finish internal diameter, and base dimensions against the approved technical drawing. Tolerance ranges should be agreed in advance; measure against them, not against your visual impression.

For dark glass, verify the UV transmission of the sample against the specification you confirmed in Phase 2. A spectrophotometer reading at 320–400nm takes minutes and removes any ambiguity about whether the sample matches the agreed formulation.

Physically test your intended closure and pourer on the sample. Check for seal quality, torque requirement, drip performance (for pourers), and ease of application. Do not assume catalog closure compatibility — test it on the specific sample.

Run a sample set through your filling line or send samples to your co-packer for a fill line test. Confirm conveyor stability, filling station alignment, and capping machine compatibility before approving production.

If the bottle has a frosted surface treatment, test your intended label adhesive against the frosted area. Standard pressure-sensitive adhesives often fail on fully frosted glass; confirm the adhesion performance of your specific label material on the actual sample before approving.

For silk screen: check colour accuracy against Pantone reference, registration consistency, edge sharpness, and resistance to abrasion. For embossing: check depth consistency, edge definition, and absence of distortion in the adjacent glass wall.

Confirm the MOQ per SKU, the pricing at your initial order volume, and the volume thresholds at which pricing improves. Understand whether MOQ is per production run or can be consolidated across multiple SKUs sharing production time. For ongoing suppliers, annual volume commitments can unlock better pricing even if individual orders are smaller.

A common payment structure for glass bottle manufacturing from China involves a deposit on order confirmation — often in the range of 30–50% — with the balance settled before shipment against the bill of lading copy. The exact terms vary by manufacturer, order size, and buyer relationship; confirm the specific structure and payment mechanics (currency, bank details, triggering documentation) in writing before signing a purchase order. 

Understand the payment mechanics — which bank, which currency, what documentation triggers the balance payment — before signing a purchase order.

Confirm the lead time for your specific order in writing: from deposit receipt to ex-works ready. Catalog formats commonly have production lead times in the range of four to six weeks from order confirmation, though this varies by manufacturer capacity and scheduling. Surface-treated or custom formats typically require additional time — often two to eight weeks depending on the treatment — and custom mold development adds 45–60 days before production begins. Confirm whether the quoted lead time includes or excludes pre-production sample approval time.

Agree the Incoterms governing delivery (FOB, CIF, EXW, or other) and confirm what is included in the quoted price. FOB (Free On Board named port) is the most common basis for China glass export — it places the cost and risk of ocean freight and destination charges with the buyer. Confirm the named port and whether inland freight to that port is included.

Confirm the manufacturer’s standard breakage allowance (the percentage of units per shipment that may arrive broken without triggering a claim) and the defect claim process — what evidence is required, what the resolution options are (credit, replacement, refund), and the timeframe within which claims must be submitted.

Verify that unit dimensions (height, diameter, neck finish) are within the agreed tolerance range across a statistically significant sample of the production batch — not just the units presented as “good examples.” Dimension drift between the pre-production sample and the production batch is one of the most common quality issues in glass manufacturing.

Check colour consistency across the batch and against the approved reference sample. Glass colour can shift between production runs if raw material batch composition or furnace conditions vary. For brands with strict shelf presentation requirements, visible colour inconsistency between pallets from the same order is unacceptable.

For silk screen or frosted orders: inspect for print registration errors, colour variation, surface scratches introduced during handling, and incomplete coverage. Agree the acceptable defect rate per thousand units in advance and inspect against that standard, not against a general impression of quality.

Confirm that secondary packaging (dividers, case liners, case sealing) matches the agreed configuration and provides adequate protection for ocean transit. Underpacked glass is the primary cause of transit breakage on glass shipments. Check case pack count, divider condition, and pallet configuration against the agreed spec.

Confirm that each production batch carries traceable lot identification — production date, furnace, batch number — that allows any quality issue identified after arrival to be traced to a specific production run. Order traceability is a standard expectation of most major retail and food manufacturing buyers.

A manufacturer that cannot produce current, valid ISO and FSSC certificates from an accredited body, or that provides self-declaration documents in place of certified documentation, does not meet the baseline compliance requirements of most developed-market retail supply chains. This is a qualification failure, not a negotiating point.

Any manufacturer producing dark glass for food packaging should have UV transmission data on file for their standard formulations. Inability to provide this data — or providing a colour name as a substitute — suggests either that the data does not exist or that the supplier does not understand why it is being requested. Both are concerning for an EVOO packaging supplier.

Reputable glass manufacturers expect to provide pre-production samples as a standard part of the order process — it protects both parties. A supplier that is unwilling to provide samples before production, or that charges disproportionate sample fees, is removing your ability to catch specification errors before they become production-batch problems.

Glass production has real cost floors driven by raw materials, energy, and certification overhead. Pricing that is dramatically below comparable suppliers for the same specification typically reflects a reduction in one of those cost components — most commonly certification compliance, quality control rigour, or glass formulation quality. Investigate the source of the cost difference before accepting it as a genuine efficiency advantage.