Duct

‧ Metal parts are made of stainless steel 304 or 316

‧ The workpiece is thoroughly inspected to confirm that all welds are finished and the metal surface has been properly disposed of and then painted.

‧ Surface coating material for ETFE/ECTFE fluorine polymer thermoplastic resin, the average coating thickness of 260.

‧ Use Direct current 2.5kv/260 Spark Tester To do pinhole test, confirmed that the surface has been completely coated, no pinhole defects.