... Pipe, cleaned by sand-blasting, then coated with phosphate solution,and finished with electro-static powder coating; other material ... TUV, GS, ISO, CCC, ISO9001: 2000 Anti-rust treatment high quality steel, safe and durable structure haredware components. Metal post use ... Pipe, cleaned by sand-blasting, then coated with phosphate solution,and finished with electro-static powder coating; other material ...