GB/T 40933-2021 PDF in English
GB/T 40933-2021 (GB/T40933-2021, GBT 40933-2021, GBT40933-2021)
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Plastics -- Film and sheeting -- Guidance on the testing of thermoplastic films
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Standards related to (historical): GB/T 40933-2021
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GB/T 40933-2021: PDF in English (GBT 40933-2021) GB/T 40933-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.140.10
CCS G 33
GB/T 40933-2021 / ISO 23559:2011
Plastics - Film and sheeting - Guidance on the testing of
thermoplastic films
(ISO 23559:2011, IDT)
ISSUED ON: NOVEMBER 26, 2021
IMPLEMENTED ON: JUNE 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 4
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 8
4 Sample preparation and state conditioning ... 8
5 Test requirements ... 9
6 Result report ... 9
Annex NA (informative) Correspondence between Chinese documents and
international documents normatively cited in this document ... 13
Bibliography ... 15
Plastics - Film and sheeting - Guidance on the testing of
thermoplastic films
Safety statement: Personnel using this document shall be familiar with normal
laboratory practice, if applicable. This document is not intended to address all safety
concerns related to its use. If so, it is related to its use. It is the user's responsibility to
establish appropriate safety and health practices and ensure compliance with relevant
regulatory requirements.
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.
3.1 film
Sheets with a nominal thickness not greater than 0.25mm.
NOTE 1: Although ISO 472 does not clearly stipulate, it mentions the limit of the nominal thickness
of the film to 0.25mm. ASTM D883 clearly stipulates that the nominal thickness of the film is
≤0.25mm.
NOTE 2: Since the sheet with a nominal thickness greater than 0.25mm is too rigid, it is not suitable
for the test method for testing thinner films.
4 Sample preparation and state conditioning
4.1 Polymer properties
Many polymer properties are related to the processability and yield of products, so they
are concerned by producers and users of film products. These properties include density,
flow characteristics and thermal properties.
The above properties shall follow the sample preparation and state conditioning
requirements specified in the material standard. If there is no material standard, the
requirements specified in this document shall be followed.
4.2 Sample preparation
This document does not contain standards for film preparation. Table 1 describes the
preparation methods of some common films of different materials and structures.
Table 1 -- Typical preparation methods for producing plastic films
Cold roll casting
Sink chilling
Blow molding - standard
Blow molding - blowing up and cooling
Blow molding - blowing down and cooling
Stretching method (biaxially stretching film)
Double bubble method (biaxially stretching film)
Calendering
The films used for testing and characterization shall be produced in accordance with
the requirements of the corresponding product standards. If a product standard does not
exist or does not address film fabrication, the same basic process as for commercial
application of films shall be used. Typical processing conditions shall be used. The
specific process, equipment and materials used are optimized. No device or technique
shall be employed which would not be used during accepted manufacturing practice. If
special conditions or equipment are used, it shall be indicated in the test report.
Key process variables shall be recorded. Keep records for a reasonable period of time
for future reference in the event of a dispute or disagreement.
4.3 Sample state conditioning
For the properties described in Table 2, the preparation and conditioning requirements
specified in the material or product standard shall apply. In the absence of material
standards or product standards, the requirements specified in this document shall be
followed.
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);
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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