| 1 | Film construction | State whether the film is cast or calendered, and provide its construction and intended application. | Request a product technical data sheet and a sample matching the quoted specification. | Construction affects conformability and the applications for which a film is designed. |
| 2 | Thickness specification | Film thickness in micrometres (µm), with a clear note on whether the adhesive and liner are excluded. | Compare the data sheet with a measurement method and results for the supplied product lot. | A clearly defined measurement prevents comparisons between different layer constructions. |
| 3 | Adhesive details | Adhesive type, application guidance, removal guidance, and any stated repositionability or air-release features. | Request written specifications and test conditions; check performance on the intended substrate. | Adhesive performance depends on the surface, installation conditions, and time after application. |
| 4 | Release liner | Liner material, thickness if specified, and any stated handling or release characteristics. | Inspect production samples and confirm that the liner specification is consistent across the order. | The liner is part of product handling and installation, and should be included in the agreed specification. |
| 5 | Conformability and installation | Documented installation limits, application temperature guidance, and recommendations for curves or recesses. | Review installation instructions and test a sample on representative vehicle surfaces. | Claims about complex curves should be supported by product-specific guidance and practical testing. |
| 6 | Outdoor durability claims | Stated service-life or weathering claims, including the exposure conditions, region, and care assumptions. | Ask for the test report or warranty terms; distinguish laboratory exposure results from field-life estimates. | Durability varies with climate, orientation, maintenance, colour, and installation conditions. |
| 7 | Colour and finish consistency | Colour reference, finish description, lot identification, and any stated colour-tolerance method. | Compare approved samples with production samples under consistent viewing conditions. | A documented approval sample and lot records help manage visible variation between orders. |
| 8 | Testing and inspection | Product-specific test results, methods, acceptance limits, sample details, and report dates. | Check that reports identify the tested product and that the method is suitable for the claimed property. | A test result is meaningful only when its sample, method, and conditions are clear. |
| 9 | Factory quality credentials | Current quality-management certificates, their scope, issuing body, covered site, and validity dates. | Verify certificates with the issuer or certification database; confirm they cover the manufacturing site and relevant activities. | A certificate should be current and relevant to the facility and processes being evaluated. |
| 10 | Production control and traceability | Manufacturing-site details, batch or lot coding, inspection records, complaint handling, and change-control procedures. | Request a sample lot record and confirm how the supplier traces finished rolls to production and inspection records. | Traceability and documented controls support consistent orders and faster investigation of quality issues. |