GB/T 40933-2021Plastics - Film and sheeting - Guidance on the testing of thermoplastic films (English PDF)

1 Scope

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.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 307, Plastics - Polyamides - Determination of viscosity number

ISO 527-3, Plastics - Determination of tensile properties - Part 3: Test conditions for films and sheets

ISO 1133-1, Plastics - Determination of the melt mass-flowrate (MFR) and melt volume-flow rate (MVR) of thermoplastics - Part 1: Standard method

ISO 1183-1, Plastics - Methods for determining the density of non-cellular plastics - Part 1: Immersion method, liquid pycnometer method and titration method

ISO 1183-2, Plastics - Methods for determining the density of non-cellular plastics - Part 2: Density gradient column method

ISO 1183-3, Plastics - Methods for determining the density of non-cellular plastics - Part 3: Gas pyknometer method

ISO 2813, Paints and varnishes - Determination of specular gloss of non-metallic paint film at 20°,60° and 85°

ISO 4589-1, Plastics - Determination of burning behaviour by oxygen index - Part 1: Guidance

ISO 4589-2, Plastics - Determination of burning behaviour by oxygen index - Part 2: Ambient-temperature test

ISO 4592, Plastics - Film and sheeting - Determination of length and width

ISO 4593, Plastics - Film and sheeting - Determination of thickness by mechanical scanning

ISO 6383-1, Plastics - Film and sheeting - Determination of tear resistance - Part 1: Trouser tear method

ISO 6383-2, Plastics - Film and sheeting - Determination of tear resistance - Part 2: Elmendorf method

ISO 7765-1, Plastics - Film and sheeting - Determination of impact resistance by the free-falling dart method - Part 1: Staircase methods

ISO 7765-2, Plastics film and sheeting - Determination of impact resistance by the free-falling dart method - Part 2: Instrumented puncture test

ISO 8256, Plastics - Determination of tensile-impact strength

ISO 8295, Plastics - Film and sheeting - Determination of the coefficients of friction

ISO 8296, Plastics - Film and sheeting - Determination of wetting tension

ISO 9773, Plastics - Determination of burning behaviour of thin flexible vertical specimens in contact with a small-flame ignition source

ISO 11357-2, Plastics - Differential scanning calorimetry (DSC) - Part 2:

Determination of glass transition temperature

ISO 11357-3, Plastics - Differential scanning calorimetry (DSC) - Part 3:

Determination of temperature and enthalpy of melting and crystallization

ISO 11443, Plastics - Determination of the fluidity of plastics using capillary and slit-die rheometers Permanent Deformation and Stress Retention of Stretch Wrap Film

ASTM D 5748, Standard Test Method for Protrusion Puncture Resistance of Stretch Wrap Film

ASTM F 88, Standard Test Method for Seal Strength of Flexible Barrier Materials

ASTM F 1921, Standard Test Methods for Hot Seal Strength (Hot Tack) of Thermoplastic Polymers and Blends Comprising the Sealing Surfaces of Flexible Webs

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

4 Sample preparation and state conditioning

5 Test requirements

In the absence of material or product standards, the test methods, test conditions and units specified in Table 2 shall be used when determining the data. The number of specimens shall be determined according to the requirements of specific test standards.

All tests in Table 2 need not be performed in every case. The specific test part depends on the film type, intended use and test objectives. That is, research and development, manufacturing, quality control, may be negotiated by the relevant parties.

6 Result report

The type of film suitable for testing, its use and any agreement between the supplier and the purchaser, the report shall normally include the following. In addition, any other information and data of a non-proprietary nature considered suitable for the intended purpose of the test shall be included:

a) Description of the film, for example, type, material, formulation components (if it is a blended material), structure (if it is co-extruded or compounded);