Packaging. Transport packaging for dangerous goods. Comparative material testing of polyethylene grades
1Key Takeaways
This European Standard specifies material parameters, test requirements and procedures for high molecular weight high density polyethylene (PE-HDHMW) and medium molecular weight high density polyethylene (PE-HD-MMW) for use in the manufacture of dangerous goods packaging and IBC. It is intended to be used in conjunctio…
2Expert Interpretation
This in-depth guide explains the testing requirements for polyethylene packaging materials used for the transport of dangerous goods under BS EN 15507:2017. It includes comparative test methods for key parameters such as melt flow rate, density, and low-temperature notched impact strength, as well as guidance on the application of selected test procedures. It is suitable for packaging manufacturers and testing laboratories.
Analysis of the Standard's Core Content
BS EN 15507:2017, the UK's national implementation of EN 15507:2017, replaces the now-defunct 2008 version. This standard specifically establishes a system for comparative testing of high-density polyethylene (PE-HD) packaging materials used in the transport of dangerous goods.
Key parameters of material testing
| Test items | Test standard | Qualification criteria |
|---|---|---|
| Melt mass flow rate (MFR) | EN ISO 1133-1 | The MFR of the new material must be within the range of 70%-130% of the reference material |
| Density test | EN ISO 1183-1 | Density of new material ≥ density of reference material -2kg/m³ |
| Low-temperature notched impact strength | EN ISO 179-1 | Strength of new material ≥ 90% of that of the reference material |
| Environmental stress crack resistance (FNCT) | ISO 16770 | Crack time of new material ≥ 80% of that of the reference material |
Test sample preparation specifications
The standard specifically stipulates the sample preparation requirements for different test items:
- MFR test directly uses raw material particles
- Density test uses 2mm thick molded sheets
- Impact strength test requires 4mm thick sheets
- FNCT test requires 6mm thick special specimens
Note: Reactor powder materials must be formed before testing to ensure that the material is fully homogenized.
Selective testing mechanism
When a new material fails to fully meet the requirements of clauses 4.3-4.6, selective testing must be implemented in accordance with Table 1 of the standard:
Example: If the density difference exceeds the allowable range, a drop test and a hydraulic test under acetic acid solution conditions must be added; if the molecular degradation index exceeds the standard, a full set of tests under 55% nitric acid solution conditions must be carried out.
Technical Evolution of Standards
Main changes compared with the 2008 version:
- Updated references to obsolete standards (EN ISO 16101, etc. replaced by EN ISO 16495)
- Improved the normative text of term definitions
- Added detailed operating procedures for molecular degradation tests
- Referred on the triggering conditions for selective testing
Implementation Recommendations
Users are advised to pay special attention to the following:
- All comparative tests should be completed simultaneously in the same laboratory
- The test report must include traceability information such as material batch number and sample source
- Pay attention to coordination with international dangerous goods transport regulations such as ADR/RID/IMDG
- For recycled plastic materials, this standard is explicitly not applicable