GB/T 2546.2-2022 English PDF (GBT2546.2-2022)

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GB/T 2546.2-2022: Plastics - Polypropylene(PP) moulding and extrusion materials - Part 2: Preparation of test specimens and determination of properties
GB/T 2546.2-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.20
CCS G 31
Replacing GB/T 2546.2-2003
Plastics - Polypropylene (PP) Molding and Extrusion
Materials - Part 2: Preparation of Test Specimens and
Determination of Properties
(ISO 19069-2:2016, MOD)
ISSUED ON: JULY 11, 2022
IMPLEMENTED ON: FEBRUARY 1, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative References ... 6
3 Terms and Definitions ... 9
4 Specimen Preparation ... 9
5 Specimen Conditioning ... 10
6 Determination of Properties ... 10
Appendix A (informative) A Comparison List of Normative References between this
Document and ISO 19069-2:2016 ... 15
Bibliography ... 17
Plastics - Polypropylene (PP) Molding and Extrusion
Materials - Part 2: Preparation of Test Specimens and
Determination of Properties
1 Scope
This document specifies the methods and conditions for the specimen preparation and
properties determination of polypropylene (PP) molding and extrusion materials. This
document also specifies the requirements for the pre-treatment of test materials and the
conditioning of specimens before testing.
This document lists properties and test methods suitable and necessary for characterizing
polypropylene (PP) molding and extrusion materials. These properties are selected from the
general test methods of GB/T 19467.1. This document also lists other test methods extensively
applied or of special significance for molding and extrusion materials, as well as the
determination methods of the properties designation in Part 1.
In order to ensure that the test results are reproducible and repeatable, it is necessary to use the
methods of specimen preparation and conditioning specified in this document, as well as the
specified specimen sizes and test methods. The test data obtained using specimens prepared
under different conditions or using specimens of different sizes may not be consistent.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 1033.1 Plastics - Methods for Determining the Density of Non-cellular Plastics - Part 1:
Immersion Method, Liquid Pycnometer Method and Titration Method (GB/T 1033.1-2008, ISO
1183-1:2004, IDT)
GB/T 1033.2 Plastics - Methods for Determining the Density of Non-cellular Plastics - Part 2:
Density Gradient Column Method (GB/T 1033.2-2010, ISO 1183-2:2004, MOD)
GB/T 1033.3 Plastics - Methods for Determining the Density of Non-cellular Plastics - Part 3:
Gas Pycnometer Method (GB/T 1033.3-2010, ISO 1183-3:1999, IDT)
GB/T 1034 Plastics - Determination of Water Absorption (GB/T 1034-2008, ISO 62:2008, IDT)
GB/T 1040.2 Plastics - Determination of Tensile Properties - Part 2: Test Conditions for
Molding and Extrusion Plastics (GB/T 1040.2-2022, ISO 527-2:2012, IDT)
GB/T 1043.1 Plastics - Determination of Charpy Impact Properties - Part 1: Non-instrumented
Impact Test (GB/T 1043.1-2008, ISO 179-1:2000, IDT)
GB/T 1043.2 Plastics - Determination of Charpy Impact Properties - Part 2: Instrumented
Impact Test (GB/T 1043.2-2018, ISO 179-2:1997, IDT)
GB/T 1408.1 Insulating Materials - Test Methods for Electric Strength - Part 1: Test at Power
Frequencies (GB/T 1408.1-2016, IEC 60243-1:2013, IDT)
GB/T 1409 Recommended Methods for the Determination of the Permittivity and Dielectric
Dissipation Factor of Electrical Insulating Materials at Power, Audio and Radio Frequencies
including Meter Wavelengths (GB/T 1409-2006, IEC 60250:1969, MOD)
GB/T 1632.3 Plastics - Determination of the Viscosity of Polymers in Dilute Solution Using
Capillary Viscometer - Part 3: Polyethylenes and Polypropylenes (GB/T 1632.3-2010, ISO
1628-3:2001, MOD)
GB/T 1634.2 Plastics - Determination of Temperature of Deflection under Load - Part 2:
Plastics and Ebonite (GB/T 1634.2-2019, ISO 75-2:2013, MOD)
GB/T 2406.2 Plastics - Determination of Burning Behavior by Oxygen Index - Part 2: Ambient-
temperature Test (GB/T 2406.2-2009, ISO 4589-2:1996, IDT)
GB/T 2408 Plastics - Determination of Burning Characteristics - Horizontal and Vertical Test
(GB/T 2408-2008, IEC 60695-11-10:1999, IDT)
GB/T 2918 Plastics - Standard Atmospheres for Conditioning and Testing (GB/T 2918-2018,
ISO 291:2008, MOD)
GB/T 3682.1 Plastics - Determination of the Melt Mass-flow Rate (MFR) and Melt Volume-
flow Rate (MVR) of Thermoplastics - Part 1: Standard Method (GB/T 3682.1-2018, ISO 1133-
1:2011, MOD)
GB/T 4207 Method for the Determination of the Proof and the Comparative Tracking Indices
of Solid Insulating Materials (GB/T 4207-2012, IEC 60112:2009, IDT)
GB/T 9341 Plastics - Determination of Flexural Properties (GB/T 9341-2008, ISO 178:2001,
IDT)
GB/T 9352 Plastic - Compression Molding of Test Specimens of Thermoplastic Materials
(GB/T 9352-2008, ISO 293:2004, IDT)
GB/T 11546.1 Plastic - Determination of Creep Behavior - Part 1: Tensile Creep (GB/T
11546.1-2008, ISO 899-1:2003, IDT)
ASTM D5420 Standard Test Method for Impact Resistance of Flat, Rigid Plastic Specimen by
Means of a Striker Impacted by a Falling Weight (Gardner Impact)
3 Terms and Definitions
This document does not have terms or definitions that need to be defined.
4 Specimen Preparation
4.1 General Rules
Whether it is injection molding or compression molding, it is quite necessary to adopt the same
conditions and procedures to prepare specimens.
Table 3 and Table 4 provide the conditions of each test method. In the column of letters of
specimen preparation in the tables, M means injection molding and Q means compression
molding.
4.2 Pre-treatment Materials before Molding
Before molding, the test materials generally require no pre-treatment.
4.3 Injection Molding
The injection molded specimens shall be carried out in accordance with the stipulations of GB/T
17037.1 or GB/T 17037.3, and the conditions specified in Table 1 shall be used.
During injection molding, proper packing pressure shall be used to obtain defect-free molded
parts. The uniformity shall be inspected by weighing the mass of the molded parts, and the mass
deviation shall not exceed 1% of the mass of the molded parts.
Certain heat-sensitive polypropylenes may cause molecular degradation during the molding
process. The melt mass-flow rate (MFR) value of these materials after molding greater than 1.5
times the original value shall be avoided. If the MFR value exceeds 1.5 times the original value,
the melt temperature shall be reduced by 10 C each time, until the MFR value is less than 1.5
times the original value. The adjustment of the melt temperature shall be stated in the test report.
4.4 Compression Molding
Compression-molded sheets shall comply with the stipulations of GB/T 9352 and adopt the
conditions specified in Table 2.
During compression molding, frame molds can be used, but full pressure shall be maintained
while starting to cool. This can prevent the melt from being forced out of the frame or becoming
pitted.
When using the frame molds, the full pressure acts on the mol...