GB/T 40006.2-2021 English PDF (GB/T40006.2-2021)

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GB/T 40006.2-2021: Plastics - Recycled plastics - Part 2: Polyethylene(PE) materials
GB/T 40006.2-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.20
CCS G 32
Plastics - Recycled plastics -
Part 2: Polyethylene (PE) materials
ISSUED ON: MAY 21, 2021
IMPLEMENTED ON: DECEMBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
Introduction ... 4 
1 Scope ... 6 
2 Normative references ... 6 
3 Terms and definitions ... 7 
4 Classification and designation... 8 
5 Requirements ... 8 
6 Test methods ... 10 
7 Inspection rules ... 15 
8 Marking ... 17 
9 Packaging, transportation and storage ... 17 
Appendix A (Informative) Typical infrared spectrograms of polyethylene ... 19 
Appendix B (Informative) Other properties of polyethylene recycled plastic .. 21 
Bibliography ... 22 
Plastics - Recycled plastics -
Part 2: Polyethylene (PE) materials
1 Scope
This document specifies the classification and designation, requirements, test
methods, inspection rules, marking, packaging, transportation and storage, etc.
of polyethylene recycled plastics.
This document applies to polyethylene recycled plastic particles made from
waste polyethylene plastics as raw materials through processes such as
screening, classification, cleaning, melt extrusion granulation (including
granulation processes such as bracing, hot cutting and/or water cutting). The
matrix of the polyethylene recycled plastic is all ethylene homopolymers
specified in GB/T 1845.1, as well as other ethylene copolymers with 1-olefin
monomers less than 50% in mass fraction and non-olefin monomers
(containing functional groups) not more than 3% in mass fraction.
This document does not apply to polyethylene recycled plastics from hazardous
wastes and radioactive wastes such as medical waste, pesticide packaging.
This document does not apply to polyethylene and polypropylene mixed
recycled plastics.
2 Normative references
The contents of the following documents, through normative references in this
text, constitute indispensable provisions of this document. Among them, for
dated references, only the edition corresponding to that date applies to this
document. For undated references, the latest edition (including all amendments)
applies 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 1040.2 Plastic - Determination of tensile properties - Part 2: Test
conditions for moulding and extrusion plastic
GB/T 1845.2-2006 Plastics - Polyethylene (PE) moulding and extrusion
materials - Part 2: Preparation of test specimens and determination of
properties
GB/T 2035 Terms and definitions for plastics
GB/T 2547 Plastic resins - Sampling
GB/T 2918 Plastics - Standard atmospheres for conditioning and testing
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 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 9345.1-2008 Plastics - Determination of ash - Part 1: General methods
GB/T 17037.1-2019 Plastics - Injection moulding of test specimens of
thermoplastic materials - Part 1: General principles, and moulding of
multipurpose and bar test specimens
GB/T 19466.3 Plastics - Differential scanning calorimetry (DSC) - Part 3:
Determination of temperature and enthalpy of melting and crystallization
GB/T 19466.6 Plastics - Differential scanning calorimetry (DSC) - Part 6:
Determination of oxidation induction time (isothermal OIT) and oxidation
induction temperature (dynamic OIT)
GB/T 30102 Plastics - Guidelines for the recovery and recycling of plastic
waste
GB/T 37426 Plastics - Test specimens
GB/T 39690.1-2020 Plastics - Mixtures of polypropylene (PP) and
polyethylene (PE) recyclate derived from PP and PE used for flexible and
rigid consumer packaging - Part 1: Designation system and basis for
specification (ISO 18263-1:2015, IDT)
GB/T 40006.1-2021 Plastics - Recycled plastic - Part 1: General rules
SH/T 1541.1 Plastics - Test methods for the appearance of plastics - Part 1:
Visual method
SH/T 1770 Plastics - Determination of water content for polyethylene
3 Terms and definitions
The terms and definitions defined in GB/T 40006.1-2021, GB/T 2035 and GB/T
When the MFR (190 °C, 2.16 kg) of the polyethylene recycled plastic is greater
than or equal to 1.0 g/10 min, it is recommended to use the injection moulding
method to prepare the specimens. The MFR determination is carried out in
accordance with the provisions of GB/T 3682.1.
According to GB/T 17037.1-2019, prepare specimens. The shape of the
specimen conforms to the tensile specimen type A1 and the bar specimen type
B1 (80 mm×10 mm×4 mm) specified in GB/T 37426.
6.2.2 Preparation of compression-moulded test pieces
For the preparation of compression-moulded test pieces of polyethylene
recycled plastic, see the provisions of 3.3 in GB/T 1845.2-2006.
When the MFR (190 °C, 2.16 kg) of polyethylene recycled plastic is less than
1.0 g/10 min or is required, the specimen is prepared by compression moulding.
Use punching or machining methods to prepare tensile specimen type A2 and
bar specimen type B3 (80 mm×10 mm×4 mm), which are in accordance with
GB/T 37426, from compression-moulded test pieces with a thickness of 4 mm.
6.3 Standard atmospheres for conditioning and testing of specimens
6.3.1 Conditioning of specimens
Unless otherwise specified in the test method, for unfilled PE recycled plastic,
the conditioning of the specimen shall be in accordance with the provisions of
GB/T 2918. The atmosphere for conditioning is temperature 23 °C±2 °C; time
is at least 16 h. For the specimens of filled PE recycled plastic material, the
requirement of relative humidity of 50%±10% shall be added.
6.3.2 Standard atmospheres for testing
All tests shall be carried out in the standard test atmospheres specified in GB/T
2918. The temperature is 23 °C±2 °C. The relative humidity is 50%±10%.
6.4 Qualitative analysis of main material
6.4.1 Infrared
According to the infrared spectroscopy of transmission method and attenuated
total reflection method specified in Appendix A of GB/T 40006.1-2021, the
material is qualitatively determined.
The film pressing temperature is 180 °C. The recommended film thickness is
30 μm~40 μm.
𝑆ఌ೟ಳ - The standard deviation of nominal strain εtB at tensile break;
𝜀௧஻തതതത - The average value of nominal strain εtB at tensile break.
6.14 Oxidation induction time (OIT)
Test according to GB/T 19466.6. The test temperature is 200 °C. The test
container is an aluminum dish. Take three specimens for testing and report the
average value.
7 Inspection rules
7.1 Inspection classification and inspection items
7.1.1 Inspection classification
The inspection of polyethylene recycled plastic products can be divided into two
types: exit-factory inspection and type inspection.
7.1.2 Inspection items
7.1.2.1 Exit-factory inspection items
The exit-factory inspection of polyethylene recycled plastics shall include at
least:
a) Particle appearance;
b) Ash;
c) Density;
d) Melt mass-flow rate;
e) Odor.
7.1.2.2 Type inspection items
All items in Clause 5 are type inspection items.
In the following situa...