All post caps are powder coated to BS-13438 and are salt spray tested to 1,000 hours to BS 3900F4, impact resistance to BS 3900E3, scratch resistance to BS 3900E2, and humidity minimum 1,000 hours to BS3900F2. DuraPost post caps are manufactured in galvanised steel (DX51D Z275NA-C) to EN 10346 with 20 µm of galvanisation.