Plastic bellows material is high density polyethylene (hdpe), which itself does not corrode, but its corrosion resistance, aging resistance far superior to metal materials, a large number of domestic cable outer sheath of the cable-stayed bridge is the best Proof. Such as tendons provides a far superior barrier protection metal bellows seal, good impermeability, more suitable for vacuum grouting. 1. The technical requirements in line with the transportation industry standard jt / t 529-2004 2. Material: prestressed plastic corrugated pipe using the original granular raw materials. Do not use powdered and granular materials recycling. High-density polyethylene (hdpe) shall meet the requirements gb / t11116, and polypropylene (pp) shall meet the requirements gb / t18742.1 of. 3. Appearance: prestressed plastic bellows appearance should be smooth, uniform color, inside and outside the walls of the spacer does not allow broken, scratched bubbles, cracks, lumps and affect use. 4. Ring stiffness: prestressed plastic corrugated pipe ring stiffness of not less than 6kn / m2 5. partial lateral load: prestressed plastic corrugated pipe to withstand the lateral partial load, the pipe surface should not rupture; 5min after unloading pipe shall not exceed the amount of residual deformation 10% of the pipe diameter. 6. Flexibility: prestressed plastic corrugated pipe bending method prescribed after repeated bending or five times, special plug can be passed from prestressed corrugated plastic pipe, then qualified prestressed flexible corrugated plastic. 7. Impact resistance: prestressed plastic bellows cryogenic vacuum drop hammer impact test impact tir maximum allowable rate is 10%. Storage Note: 1, should be stored away from heat and oil and chemical pollution areas. Outdoor stacking is not directly on the ground, and should be covered. 2, the storage location should be flat, stacking height should not exceed 3m. 3, since the date of production storage period, usually less than one year.