Firstly, GB/T 13663.2-2018 is a Chinese national standard specifically designed for PE pipes used in water supply. It covers raw material selection, pipe dimensions, pressure ratings, performance requirements, and testing methods. This standard specifies the technical parameters for producing water pipes from high-density polyethylene (HDPE) or medium-density polyethylene (MDPE) resins. It clearly defines nominal pipe diameters, wall thicknesses, and allowable deviations. The standard also specifies ring stiffness, pressure resistance, and long-term performance to ensure the reliability and safety of PE pipes in water supply systems. In addition, it regulates the composition of materials, including carbon black content and the use of antioxidants, to provide adequate UV resistance and corrosion protection.
The ISO 4427 standard, on the other hand, is internationally recognized and widely adopted. Its full title is Plastics piping systems — Polyethylene (PE) pipes and fittings for water supply. ISO 4427 provides uniform technical requirements for the production, testing, and performance evaluation of PE pipes and fittings worldwide. Similar to GB/T 13663.2-2018, it specifies acceptable resin types, pressure ratings, dimensions, and allowable deviations. The standard also includes detailed testing methods for pressure resistance, ring stiffness, and impact performance. ISO 4427 ensures consistency in design and testing practices, providing a reliable technical reference for international trade and cross-border engineering projects.
From a materials perspective, GB/T 13663.2-2018 and ISO 4427 have highly consistent requirements. Both standards typically use PE100 or PE80 virgin polyethylene resins, mixed with appropriate amounts of carbon black and stabilizers, ensuring UV resistance and corrosion protection. The raw material selection, formulation, and processing requirements are largely compatible, guaranteeing that PE pipes meeting one standard generally meet the core requirements of the other.
However, there are some differences in details. For example, pipe dimensions and weight per meter may differ slightly between GB/T 13663.2-2018 and ISO 4427 due to different calculation formulas and allowable deviations. This explains why some customers may find that the pipe weight per meter they require differs from the manufacturer’s standard specifications. Additionally, the testing methods differ slightly: GB/T 13663.2-2018 refers to Chinese testing protocols, while ISO 4427 follows international methods. Although the specific conditions, such as test temperature and duration, may vary, the ultimate goal—ensuring pipe performance and reliability—remains the same.
Regarding pressure ratings and SDR (Standard Dimension Ratio) series, the two standards are largely consistent. Both specify nominal pressure ratings such as PN6, PN10, and PN16, and support common SDR series including SDR11, SDR17, and SDR21. This makes the pipes largely interchangeable between domestic and international markets in terms of basic performance parameters.
For purchasers, understanding these similarities and differences is essential. In the domestic market, for urban water supply, residential, or industrial projects, pipes produced according to GB/T 13663.2-2018 generally meet construction and acceptance requirements. This complies with domestic regulations and engineering norms and facilitates project approvals and inspections. For international markets or export projects, particularly in the EU or other overseas regions, referring to ISO 4427 or providing third-party test reports demonstrating compliance with ISO 4427 is advisable. Although pipes produced according to GB/T 13663.2-2018 generally meet the performance criteria of ISO 4427, international customers or project engineers usually prefer to see third-party verification confirming conformity to international standards.
In addition, material composition is an important consideration in procurement. Pipes manufactured using 100% virgin black compound—virgin polyethylene mixed with carbon black and stabilizers—ensure long-term pressure resistance, corrosion resistance, and UV protection. Whether produced according to GB/T 13663.2-2018 or ISO 4427, using virgin material is essential for maintaining high-quality pipe performance.
Overall, GB/T 13663.2-2018 and ISO 4427 are highly similar in pipe type, material grade, pressure ratings, and performance requirements. Differences mainly exist in weight calculation per meter, testing methods, and standard applicability regions. Purchasers can follow GB/T 13663.2-2018 for domestic projects, refer to ISO 4427 for international projects, or provide test reports demonstrating compliance with both standards, ensuring pipes meet engineering requirements and have reliable technical support.
In conclusion, understanding the content and differences between GB/T 13663.2-2018 and ISO 4427 is essential for both manufacturers and purchasers. It not only facilitates proper selection of pipe specifications and quality control but also supports export and international engineering projects. By combining standard compliance and third-party verification, customers can obtain PE water pipes with reliable performance that meet international requirements, providing long-term safe and stable water supply solutions for urban and industrial applications.
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