1)  Material: Main pole diameter 140mm,   3mm thickness Q235steel pipe;  Stainless steel screw and nuts; aluminium ground cover;

2)  Pipe surface treatment: double layer powder covered (first layer covered by DUPON powder mixed with 70% zinc powder; second layer covered by DUPON color  powder)                                                     

3)  No rusting under 800hours salty pray test (NaCl under 42°C temperature), , which equals to 33 years under nature environment;                                                

4)  No aging or deformation phenomenon after 800hours Xenon lamping aging test under 40°C, huminity50% (by simulated sunshine,   rain and dew). 800hours equals to 33 years outside;                                                                    

5)  No crack or change after 8 hours under -45°C temperature and can work normally  after 8 hours under +45°C in High-Low Temperature chamber;