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GB/T 1038.2-2022

Plastics—Film and sheeting—Determination of gas-transmission rate—Part 2:Equal-pressure methods (English Version)

GB/T 1038.2-2022
Standard No.
GB/T 1038.2-2022
Language
Chinese, Available in English version
Release Date
2022
Published By
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest
GB/T 1038.2-2022
Scope
This document specifies two test methods for determining the gas permeability of plastic films, sheets, co-extruded materials, plastic-coated materials and laminates under isobaric conditions—coulomb sensor method and gas chromatography. This document is applicable to the determination of gas permeability of plastic films and sheets, and the determination of gas permeability of other materials can be used as a reference.
Introduction

Evolution of standard technology and significance of implementation

The new standard is based on the 2003 version of ISO 15105-2 and has been revised locally, with significant improvements in three major areas that are suitable for my country's industrial needs:

Transformation directionMissing items in international standardsmy country's transformation plan
Measurement compatibility Composite material testing requirements are not considered New co-extruded material and plastic coating material test specifications
Instrument adaptability Adopt ISO4593 thickness specification Optimized to GB/T6672, which is more suitable for film testing
Safety Implementation Standards Includes detailed warning clauses Delete safety warning information that does not affect data fidelity

Key Instrument Configuration Guide

Selection principles for heavy equipment dedicated to moisture permeability testing:

  • Coulomb analysis chamberShould ensure effective penetration surface:
    The dimensional accuracy of the gem sealing ring needs to be ±0.02mm
  • Temperature Control Humidity ChamberCorresponding to complex profile testing conditions:
    Dual circulation air duct control deviation ±0.5℃/±2%RH

Application case: The average oxygen permeability of PET/AL composite film is 13cm³/(m2·d), and the deviation of each point is less than 7%, which meets the TS16949 automotive standard.


Key points for implementing quality assurance

Data distortion prevention mechanism

Abnormal typeOccurrence scenarioResponse method
Background interference Volatile components of sealing grease are detected 60℃ vacuum degassing treatment is required before using non-migrating silicone sealing ring
Thermodynamic fluctuations Synchronous calibration error of multi-channel equipment Configure cross-measurement of standard reference films from the same batch

Project implementation suggestions: Complete the raster scanning of the sampling area thickness in advance according to GB/T6672 to ensure that the thickness ratio of the sample does not exceed 1:1.2

GB/T 1038.2-2022 Referenced Document

  • GB/T 6672 Plastics film and sheeting Determination of thickness by mechanical scanning

GB/T 1038.2-2022 history

  • 2022 GB/T 1038.2-2022 Plastics—Film and sheeting—Determination of gas-transmission rate—Part 2:Equal-pressure methods

GB/T 1038.2-2022 -All Parts




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