How to Spec Thermoformed Tray Wall Thickness for Retail Food

Quick answer

Specify thermoformed trays by material, cavity drawing, minimum wall thickness in critical zones, flange design, and sealing/lidding needs—not by a tray photo. Deep draws thin corners; thickness must be measured where the pack fails, not only on the flange.

Start from the fill and seal

State product weight, sealing film or lid type, and whether trays see MAP, hot fill, or chilled distribution. Seal flanges need flatness as much as cavity walls need thickness.

Lock material and thickness

Name PET, PETG, PP, or other grade, sheet gauge, and minimum corner/wall thickness targets. Ask how thickness is measured and sampled in production.

Design for nesting and denesting

Retail lines need consistent nesting without locked stacks. Draft, ribs, and stacking lugs affect both thickness distribution and packing labor.

Validate food-contact and transit

Require declarations for the intended food contact and test crush/denest with real lids. Approve production tools, not only prototype molds.

RFQ

Cavity CAD; material; sheet gauge

Min wall/corner thickness; flange flatness

Lid/seal method; food-contact docs

Nesting trial; tooling ownership; monthly volume

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