Specific indicators required by the specification of plastic corrugated pipes
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 [...]