Specific indicators required by the specification of plastic corrugated pipes:
1. Raw materials
The raw materials of plastic corrugated pipes should use original granular raw materials. It is strictly forbidden to use powdered and re-granulated granular raw materials.
2. Appearance
The appearance of plastic corrugated pipes should be smooth and uniform in color. The inner and outer walls are not allowed to have partition ruptures, bubbles, cracks, lumps and scratches that affect use.
3. Ring stiffness
The ring stiffness of plastic corrugated pipes should not be less than 6kN/m2. Local transverse load When the plastic corrugated pipe is subjected to a local transverse load, the surface of the pipe should not be broken; the deformation of the pipe after unloading for 5 minutes shall not exceed 10% of the outer diameter of the pipe.
4. Flexibility
After the plastic corrugated pipe is repeatedly bent five times according to the specified bending method, the special plug gauge can pass through the plastic corrugated pipe smoothly, and the flexibility of the plastic corrugated pipe is qualified.
5. Impact resistance
The maximum allowable value of the true impact rate TIR of the low-temperature drop hammer impact test of plastic corrugated pipe is 10%.
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