| Raw Material Composition | Use molded fiber made primarily from sugarcane bagasse pulp; confirm whether additives, coatings, or binders are used. | Material specification, supplier declaration, and independent composition or chemical test report. | Clear material information supports accurate environmental, food-contact, and disposal claims. |
| Food-Contact Safety | The finished tray should comply with the food-contact requirements of the intended sales market. | Recent third-party migration testing for the finished product, including the actual coating and ink if applicable. | Testing the finished tray is more reliable than testing pulp or raw material alone. |
| Temperature Resistance | Define the required range for chilled sushi, room-temperature service, or warm food; verify performance under actual use conditions. | Test report showing dimensional stability, softening, leakage, and deformation at the agreed temperatures. | Sushi trays may encounter refrigeration, condensation, transport heat, and short-term warming. |
| Oil and Moisture Resistance | The tray should resist sauce, fish oils, rice moisture, and condensation for the planned display and delivery period. | Grease-resistance and water-resistance test results, plus a practical filled-tray trial lasting at least the required shelf-life period. | Poor resistance can cause leakage, loss of rigidity, and unattractive presentation. |
| Tray Dimensions and Capacity | Confirm external dimensions, internal usable area, depth, rim width, stack height, and nominal serving capacity in grams or pieces. | Approved technical drawing, dimensional inspection report, and production samples. | Accurate dimensions are essential for product fit, lids, labels, cartons, and automated packing. |
| Dimensional Tolerance | Agree measurable tolerances before production; a common starting point for molded-fiber packaging is approximately ±2–3% for overall dimensions, subject to design and process capability. | Inspection standard, calibrated measuring equipment, and batch inspection records. | Defined tolerances reduce lid-fit, stacking, and packaging-line problems. |
| Wall Thickness and Strength | Select thickness and compression strength according to the filled weight, stacking height, delivery distance, and carton configuration. | Thickness measurements, compression or stacking test results, and filled-tray transport samples. | Strength must be evaluated in the final shape because ribs, corners, and moisture affect performance. |
| Surface Quality | Finished trays should be free from cracks, sharp edges, delamination, excessive fiber particles, oil stains, and visible deformation. | Pre-production sample approval, visual inspection criteria, and defect classification standard. | Consistent surface quality affects food presentation, handling safety, and customer perception. |
| Lid Compatibility | The lid should close securely without crushing sushi, opening during transport, or creating excessive condensation. | Closure-force check, leakage test, stacking test, and filled-tray delivery simulation. | A reliable closure protects food and reduces returns caused by spills or damaged products. |
| Printing and Decoration | Use food-contact-appropriate inks and define print position, color tolerance, abrasion resistance, and maximum printable area. | Ink compliance documents, color approval sample, rub-resistance test, and print inspection records. | Print can affect food safety, appearance, recycling claims, and brand consistency. |
| Compostability or Disposal Claims | Claims should apply to the complete tray, including coatings, inks, labels, and adhesives, and should identify the required industrial or home-composting conditions. | Certification or laboratory report for the finished product and clear disposal instructions for the target market. | A fiber-based product is not automatically suitable for every composting or recycling system. |
| Production Capacity | Capacity should be stated in pieces per day or month for the specific tray design, not only for the entire factory. | Capacity statement, machine list, production schedule, and records from comparable orders with sensitive information removed. | Design-specific capacity provides a more realistic basis for delivery planning. |
| Quality Control System | Use documented incoming-material, in-process, finished-product, and pre-shipment inspections. | Quality manual, inspection checklist, corrective-action records, and sample inspection report. | A documented system improves repeatability and makes quality issues traceable. |
| Batch Traceability | Each shipment should be traceable to production date, raw-material batch, tooling, operators, and inspection records. | Example batch code, traceability procedure, and product recall process. | Traceability supports faster investigation and controlled corrective action. |
| Tooling and Product Development | The supplier should provide design review, prototype samples, tooling drawings, trial approval, and controlled engineering changes. | Development timeline, prototype approval form, tooling ownership terms, and change-control procedure. | Structured development reduces the risk of costly tooling revisions and delayed launches. |
| Minimum Order Quantity and Lead Time | The quotation should state sample lead time, tooling lead time, mass-production lead time, minimum order quantity, and reorder lead time. | Written quotation with validity period, production assumptions, packaging details, and delay-management terms. | Transparent commercial terms make supplier comparisons more accurate. |
| Packaging and Shipping Protection | Products should be packed in clean, dry, moisture-protected cartons with defined inner quantity, carton dimensions, gross weight, and pallet configuration. | Packing specification, carton drop or compression test where applicable, and loading plan. | Proper packing reduces deformation, contamination, moisture damage, and freight inefficiency. |
| Total Cost of Ownership | Compare unit price together with tooling, testing, freight, duties, packaging, storage volume, defect rate, and expected reorder costs. | Itemized quotation and landed-cost calculation based on the same specification and delivery terms. | The lowest unit price may not provide the lowest delivered or operational cost. |