China Releases New Regulation for Weather Resistance Testing of Geosynthetics: GB/T 46286-2025
As global infrastructure construction continues to advance toward higher durability and longer service life, the anti-aging performance of geosynthetics has become the "invisible lifeline" determining engineering quality. As Sichuan Zhonglong Environmental Protection, deeply rooted in the field of geosynthetics, we have always been closely monitoring the latest developments in global industry standards.
Recently, the State Administration for Market Regulation of China, together with the Standardization Administration of China, released the "Determination of Oxidation Induction Time of Geosynthetics by High-Pressure Differential Scanning Calorimetry" (GB/T 46286-2025). This standard has officially taken effect on May 1, 2026, which provide a new reference paradigm for the quality control system of the export bussiness.
Q: Why is high-pressure differential scanning calorimetry needed?
Polyolefin materials (such as HDPE geomembranes, geogrids, etc.) are highly susceptible to oxidative degradation in complex and harsh natural environments. Traditional atmospheric pressure oxidation induction time (OIT) testing often suffers from long durations and poor data reproducibility, making it difficult to meet the demands of modern quality control.
However, GB/T 46286-2025 chooses High-Pressure Differential Scanning Calorimetry as the standard solution. This method requires the testing environment to high-pressure pure oxygen conditions at 3.4 MPa. Therefore, the extremely high oxygen partial pressure significantly accelerates the oxidation reaction of the material, not only shortening the testing cycle but also eliminating external interference.
Q: What are the positive effects of the new regulation?
As a systematic standard, GB/T 46286-2025 can be regarded as the detailed practical guidance by laboratories and enterprises
- Broad applicability: The standard is clearly applicable to mainstream products such as HDPE geomembranes, geogrids, geonets and etc., aligning with global market demands.
- Rigorous testing procedures and scientific analysis methods, thereby reducing experimental errors.
Q: What significance does it bring to the global market?
For the international import and export of related products, this standard provides an effective and reliable testing template for negotiation between buyers and sellers. At the same time, it forces the technological upgrade of the industrial chain and provides more comparison and reference for project standards both domestically and internationally.
(If you would like to learn more about how we ensure product durability through rigorous quality control, please feel free to contact our technical team at any time.)
Related products： HDPE Geomebrane, Composite Geomembrane, Geogrid, Geonet
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