| Product Quality | Material identification | Confirm the polymer type, grade, colorant, additives, and recycled-content percentage. | Material specification and lot-level declaration match the container marking and purchase order. | Unexpected odor, deformation, chemical migration, or reduced strength. | Approve only samples whose material documents match the production specification. |
| Food-contact suitability | Check intended food type, contact duration, temperature, and single-use conditions. | A use-specific declaration of compliance and supporting migration test report. | A container may be compliant for one application but unsuitable for hot, fatty, acidic, or alcoholic foods. | Define the exact food and temperature scenario before approving the product. |
| Dimensional accuracy | Measure length, width, height, wall thickness, capacity, lid fit, and stackability. | Approved drawing with tolerances; verify samples using calibrated gauges or instruments. | Lids may not seal, labels may not fit, and storage or filling efficiency may decline. | Record measured values for at least three production lots before volume purchasing. |
| Leak and seal performance | Test the container with the intended liquid or semi-liquid contents in the final orientation. | Documented leak-test method, sample size, duration, temperature, and pass/fail criteria. | Spills, contamination, product loss, and customer complaints. | Include transport simulation where containers will be shipped or delivered. |
| Mechanical durability | Check compression, drop resistance, puncture resistance, lid retention, and crack formation. | Internal test results or an agreed test protocol using filled containers and realistic handling conditions. | Cracking or lid separation during filling, stacking, delivery, or consumer use. | Test the weakest expected condition, including low temperature if relevant. |
| Certifications & Compliance | United States food-contact requirements | For applicable plastic materials, verify the exact resin and use conditions against relevant FDA food-contact regulations, such as 21 CFR 177.1520 for certain olefin polymers. | Current regulatory statement, formulation information, and test data covering the intended use. | A generic “FDA approved” statement may not cover the actual material, additive, food type, or temperature. | Request a regulation-specific compliance statement rather than a general marketing claim. |
| European Union food-contact requirements | Verify compliance with Regulation (EC) No 1935/2004 and, for plastics, Regulation (EU) No 10/2011 where applicable. | Declaration of Compliance plus supporting migration results; the EU overall migration limit for plastics is generally 10 mg/dm², while specific limits vary by substance. | Non-compliance, import delays, product withdrawal, or inability to sell in the target market. | Match the test simulants and conditions to the intended food application. |
| Migration and sensory testing | Review overall migration, specific migration, odor, taste, and appearance results when relevant. | Laboratory report identifies sample, material, test method, simulant, time, temperature, and result. | Chemical transfer or sensory defects may make food unacceptable even when the container looks normal. | Reject reports that lack traceability to the supplied product or use conditions. |
| Quality-management certification | Check whether the manufacturing site has a current, independently audited food-safety or quality-management certificate. | Certificate states the legal manufacturing site, scope, validity period, and certification body. | A certificate may belong to another site, an expired scope, or a different product category. | Verify certificate numbers and site addresses directly through the issuing certification body. |
| Inspection and sampling plan | Define sampling level, defect classification, sample size, and acceptance criteria. | ISO 2859-1 may be used as a reference for attribute sampling; the actual plan must be agreed in the purchase specification. | Different parties may interpret “acceptable quality” differently. | Classify critical, major, and minor defects before production begins. |
| Cost | Unit-price comparability | Compare price per 1,000 usable containers, including the matching lid, packaging, and agreed specification. | Quote clearly states material, capacity, dimensions, lid type, quantity, Incoterm, currency, and validity period. | A lower headline price may hide thinner walls, missing lids, higher freight, or weaker packaging. | Normalize all quotations to the same product specification and delivery basis. |
| Total landed cost | Calculate product price + tooling amortization + inspection + freight + duties/taxes + warehousing + expected defect cost. | Use a written cost model and a common order quantity for every supplier. | Unexpected logistics charges or defect-related replacement costs reduce the real savings. | Rank suppliers by landed cost, not factory unit price alone. |
| Minimum order quantity and tooling | Confirm minimum order quantity, mold charges, color charges, artwork fees, and replenishment quantity. | Written quotation identifies one-time and recurring charges separately. | Excess inventory, cash-flow pressure, or unexpected development fees. | Request a pilot order or staged delivery when demand is uncertain. |
| Cost versus performance | Compare cost per successful use, not only cost per piece. | Include leakage, breakage, rejected lots, returns, and customer-service costs in the evaluation. | A low-cost container can produce a higher total cost when failure rates are high. | Select the lowest compliant option that meets the required performance level. |
| Supplier Reliability | On-time and in-full delivery | Track delivery performance against the confirmed requested date and quantity. | Use the formula: OTIF rate = orders delivered on time and in full ÷ total orders × 100. | Stockouts, emergency freight, production interruptions, or lost sales. | Set a contractual OTIF target appropriate to the business and review it monthly. |
| Lead-time consistency | Separate sample, production, inspection, and transit lead times. | Supplier provides a documented production calendar and communicates delays before the confirmed ship date. | Planning becomes unreliable even when the average lead time appears acceptable. | Use historical delivery records rather than verbal estimates. |
| Traceability and change control | Confirm lot coding, raw-material traceability, retained samples, and notification of formulation or process changes. | A lot can be traced from finished goods to production date, raw material, machine, and inspection record. | Defective or non-compliant goods may be difficult to isolate and recall. | Make written approval mandatory for material, mold, site, or process changes. |
| Nonconformance and corrective action | Review defect reporting, root-cause analysis, corrective-action plans, and closure evidence. | Corrective actions identify cause, responsible person, due date, verification method, and recurrence-prevention step. | Repeated defects, slow dispute resolution, and unstable quality. | Evaluate the quality of the response, not only the initial defect rate. |
| Business continuity | Assess capacity, backup equipment, critical raw-material availability, financial stability, and disaster recovery. | Documented contingency plan and realistic capacity allocation for peak demand. | Single-source disruption can stop supply even when product quality is good. | Maintain an approved secondary source or safety stock for critical products. |