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See Chinese contents: GB/T 40933-2021 GB/T 40933-2021: Plastics -- Film and sheeting -- Guidance on the testing of thermoplastic films
This document gives producers and users test procedures for selecting and characterizing single or multilayer thermoplastic films. The purpose is to provide guidance for testing of films for which there are no existing standards or specifications. NOTE: This document does not cover sample preparation. This document is intended to provide general guidance. If a standard exists for a particular film product, the requirements of that document take precedence over this document. It does not involve specific application-specific requirements stipulated by a country, region, or industry. The importance and suitability of the data is determined by the user.
