Application note: Use test results only for the specimen construction, method, conditions and declared scope identified in the report.
Match the test method before the number
Water-vapor transmission results are sensitive to temperature, humidity gradient, specimen conditioning and test orientation. Results from different cup methods or conditions are not directly interchangeable. Record the method, units and conditions beside every declared value.
Read the sample description and scope
A report applies to the tested construction, mass, coating and specimen identification stated in the document. A result for one laminated structure does not automatically cover a different basis weight, color, adhesive, printing system or factory batch.
Match test data to the application
Water resistance, tensile strength, tear resistance, UV exposure and fire classification address different loads. Each requirement must identify the relevant layer, test method, acceptance limit and responsible party.
Selection and installation checklist
- Keep method, units and conditioning with each value.
- Match the report sample to the quoted product construction.
- Do not turn a material test into a whole-system claim.