GB/T 39690.2-2020 in English
VALIDPlastics—Mixtures of polypropylene (PP) and polyethylene (PE) recyclate derived from PP and PE used for flexible and rigid consumer packaging—Part 2：Preparation of test specimens and determination of properties
- Issued on:2020-12-14
- Implemented on:2021-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$165.00
| Standard No: | GB/T 39690.2-2020 |
| Document status: | VALID |
| Title in English: | Plastics—Mixtures of polypropylene (PP) and polyethylene (PE) recyclate derived from PP and PE used for flexible and rigid consumer packaging—Part 2：Preparation of test specimens and determination of properties |
| Title in Chinese: | 塑料 源自柔性和刚性消费品包装的聚丙烯（PP）和聚乙烯（PE）回收混合物 第2部分：试样制备和性能测定 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-12-14 |
| Implemented on: | 2021-07-01 |
| ICS Classification: | 83.080.20-Thermoplastic materials |
| Chinese Classification: | G31-Basic standards and general methods for synthetic resin and plastic |
| Professional Classification: | GB-National Standard |
| Related Topics: | Consumer Packaging
GB/T 39690.2 GB/T 39690.2-2020 Polymer Flexibility Test |
《GB/T 39690.2-2020塑料 源自柔性和刚性消费品包装的聚丙烯（PP）和聚乙烯（PE）回收混合物 第2部分：试样制备和性能测定》由TC15（全国塑料标准化技术委员会）归口，主管部门为中国石油和化学工业联合会。
Introduction
Analysis of the core content of the standard
This part is equivalent to the ISO18263-2:2015 international standard, which specifies the sample preparation and performance test methods of recycled mixtures of polypropylene (PP) and polyethylene (PE) derived from consumer product packaging. The standard particularly emphasizes:
- Scope of application: Limited to flexible/rigid consumer product packaging recyclates, excluding hazardous goods packaging materials
- Special requirements: Stabilizers need to be added to compensate for the unknown stabilizer content in the recyclate
- Specimen preparation: Strictly follow the process parameters specified in ISO19069-2
Key performance test methods
| Test items | Standard method | Specimen type | Key parameters |
|---|---|---|---|
| Melt mass flow rate (MFR) | ISO1133-1 | Molding compound | 230℃/2.16kg |
| Tensile properties | ISO527 series | A1 type spline | Rate 50mm/min |
| Simply supported beam impact strength | ISO179-1/2 | 80×10×4mm | Lateral impact |
Technological evolution and implementation suggestions
Comparison of PP/PE ratio determination technologies
The standard recommends that the supplier's traceability documents should be used to determine the ratio. The FTIR spectroscopy method (Appendix A) is only for reference:
- The FTIR method estimates the ratio of the absorption peaks at 1370cm-1 and 1464cm-1
- There is an error of ±15%, which is not suitable for complex systems containing copolymers
- It is recommended to combine DSC and other thermal analysis techniques for verification
Key points for mechanical property regulation
Appendix B shows that when PP/PE=70/30:
- Tensile strength reaches 27.0MPa
- Elongation at break 300%
- Presents a typical "sea-island" phase structure (TEM verification)
Notes on standard implementation
State conditioning: All mechanical properties tests must be conditioned at (23±2)℃ for 40-96 hours (ISO291)
Data comparability: It is recommended to test pure PP/PE reference samples simultaneously to establish the benchmark data of this laboratory
Safety tips: During melt processing, attention should be paid to the volatile impurities that may be contained in the recycled materials
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