What to Specify When Buying Clear RPET Sheet for Produce Trays

The retailer wants post-consumer recycled content in the next produce tray, and the packaging team wants shoppers to see the fruit as clearly as they do through the current pack. A quote for “clear RPET sheet” leaves both requirements open. The percentage might apply only to one layer, and a flat swatch gives you little to judge about how the finished sidewall will look on shelf.

For RPET thermoformed trays, put two separate acceptance criteria on the sheet specification: a documented post-consumer recycled content requirement and a visual standard for the formed tray. Carry both into repeat orders. Confirm food-contact suitability separately for the exact sheet and intended use.

Define what the recycled-content percentage covers

Start by deciding whether the post-consumer recycled content (PCR) figure is a minimum for acceptance or a target you can discuss during sourcing. If the retailer requires a minimum, write it as a minimum and specify whether it must be met for each supplied lot. Ask the supplier what record will support the declared percentage at delivery.

We would put the calculation basis in the RFQ before comparing quotes. For a whole-sheet claim by weight, divide the weight of post-consumer recycled material in the sheet by the total sheet weight. If a supplier quotes a percentage for the core of a multilayer sheet, ask for the corresponding whole-sheet percentage on the same weight basis. Ask the supplier to report any pre-consumer recycled content separately so purchasing can compare like for like.

Higher PCR content can affect clarity and forming consistency. The acceptable balance depends on the sheet and the tray. If the percentage is flexible, we would first qualify a construction that meets the purchasing target and the shelf appearance requirement under representative forming conditions. A higher-content proposal can then be assessed against the same visual standard.

Agree on what an acceptable tray looks like

Use a formed tray made with representative tooling and sheet gauge as the appearance reference. A flat swatch is useful for screening, but the package drawing tells you where to judge visibility. In a berry punnet, for example, the shopper may look through the sidewall as well as the lid. An area around a corner or rib may look different from a broad panel once the sheet has been drawn into shape.

Review the empty tray under agreed lighting against a consistent background, then check a filled pack under representative display conditions. The empty tray makes it easier to see faint tint and isolated specks. The filled pack shows whether those differences matter when someone looks at the produce. Mark the areas that matter on the drawing and agree on viewing distance and orientation so both sides can repeat the comparison.

We would give the main viewing panel the tightest visual limit when that is where shoppers assess the produce. If the brand accepts more variation at the flange, record that separately. A single instruction such as “match the clear sample” leaves too much room for disagreement when the next roll arrives.

Carry the approval into repeat orders

Before the first production order, agree on what constitutes a sheet lot and how the roll labels link to it. Specify which records accompany each shipment, including the sheet designation, the lot and roll identifiers, and the documentation that supports PCR acceptance on the agreed basis. If a shipment contains multiple lots, keep their records and samples identifiable through inspection and forming.

Retain a labeled flat-sheet sample and a formed tray from the qualification run. Record the sheet lot, gauge, tray drawing revision and appearance reference used for approval. For repeat orders, agree on who samples the rolls, how many rolls to sample per lot, when to form check trays and who can release the lot. If you see a shift in appearance, comparing the retained flat sheet and the check tray with their respective references can help narrow down whether to investigate the incoming material or the forming conditions first.

Put change notification into the purchase specification. Agree which changes to the sheet construction, recycled feedstock or surface treatment trigger a fresh review. Hold a lot for review if its PCR documentation fails the agreed requirement or its formed samples fall outside the appearance limits. Each criterion needs its own release decision.

Confirm food-contact suitability for the exact sheet and use

Give the supplier the destination market, produce type, whether the food touches the tray directly, and the expected contact time and temperature. Ask for supporting documentation that identifies the proposed sheet construction and covers those conditions. Where the sheet has distinct layers or a surface treatment, make sure the documentation identifies the construction you intend to order.

We would have the packaging compliance team review that evidence before releasing the sheet specification for production. If the construction or intended use changes, have the team check whether the existing documentation still applies.

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