T/GZHG 011-2020 Nano-modified Polypropylene (HPPM) Square Power Double-walledcorrugated pipe

Scope

Main technical content: 5. Technical requirements 5.1 **Appearance**: The inner and outer surfaces of the pipes should be clean and smooth, with no bubbles, obvious scratches, indentations, impurities, or color unevenness. The pipe ends should be cut flat and perpendicular to the pipe axis. 5.2 **Dimensions and tolerances**: The dimensions and tolerances shall comply with Table 1. 5.3 **Length of square pipes**: The length of HPPM square power double-wall corrugated pipes is generally 6.20m, but it can also be implemented according to the agreement between the supplier and the buyer. The length of HPPM square power double-wall corrugated pipes should include the length of the socket, and the length deviation limit is +0.5% of the length. 5.4 **Physical and mechanical properties**: The physical and mechanical properties of HPPM square power double-wall corrugated pipes shall comply with the requirements of Table 2. Table 2 Physical and mechanical properties Unit Indicators External pressure load resistance N≥3000 Flat test/deformation of the outer shape of the sample at 40% under vertical direction, immediately unload the sample without cracking. Fall hammer impact test/pass with 10/10 samples, and there should be no cracks or ruptures on the inner and outer walls of the sample. Longitudinal shrinkage rate % ≤3 Vicat softening temperature ℃ ≥135 Volume resistivity Ω·m ≥1×1011 Vertical combustion/V-2 Connection sealing/no leakage of the sample

Development Information

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