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GB/T 40006.2-2021 English PDF (GBT40006.2-2021)

GB/T 40006.2-2021 English PDF (GBT40006.2-2021)

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GB/T 40006.2-2021: Plastics - Recycled plastics - Part 2: Polyethylene(PE) materials

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.
GB/T 40006.2-2021
GB
NATIONAL STANDARD OF THE
PEOPLE 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 ??m~40 ??m.
????????????? - The standard deviation of nominal strain ??tB at tensile break;
???€?????????????????? - The average value of nominal strain ??tB 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 situations, type inspection shall be carried out:
a) When a new product is trial-produced and pattern-evaluated;
b) After formal production, if there are major changes in raw materials or processes, which may affect product properties;
by a product quality inspection conformity certificate. The conformity certificate shall indicate the product name, designation, lot number, executive standard; and be stamped with a special seal for quality inspection.
7.3.2 Reinspection rules
If an indicator of the inspection results does not meet the requirements of this document, samples from this lot of products with double the number of sampling units can be used to reinspect the item. The reinspection result shall be used as the basis for the quality determination of this lot of products.
8 Marking
There shall be a clear mark on the outer packaging bag of polyethylene recycled plastic. The content of the mark may include: trademark, name of manufacturer, address of manufacturer, standard number, product name, designation, lot number (including production date), and net content, etc. It shall be marked in a conspicuous place: "recycled plastic" or "REC".
9 Packaging, transportation and storage
9.1 Packaging
Polyethylene recycled plastic can be packed in heavy packaging bags,
polypropylene composite woven bags, or other packaging forms. During
transportation, stacking and storage, packaging materials shall be guaranteed to be free from pollution and leakage.
The net content of each bag of product can be 25 kg or other.
9.2 Transportation
Polyethylene recycled plastic is non-hazardous. During transportation and loading-unloading, sharp tools such as iron hooks shall not be used. And it shall not be thrown. The means of transport shall be kept clean, dry, and equipped with sheds or tarpaulins. During transportation, it shall not be mixed with sandy soil, broken metal, coal, glass, etc.; shall not be mixed with toxic, corrosive or flammable materials. It shall not be exposed to the sun or rain.
9.3 Storage
Polyethylene recycled plastics shall be stored in a ventilated, dry, clean warehouse with good fire-fighting facilities. When storing, it shall keep away from heat sources; prevent direct sunlight. It shall not be stacked in the open.

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