Sml Cast Iron Pipe SML En877 Epoxy Coated Cast Iron Pipe Our products are made strictly according to EN877 standard. size :range from DN50 to DN300, with 3m/pc. painting: inside epoxy paint in color yellow with thickness above 120 micron, outside paint in color red with thickness above 40 micron. If you have special requirement, please contact with us, as we could also make the painting according to your requirement. This includes a 350- hour salt-spray test, a 30-day waste water test at 23˚C and a 30-day chemical resistance test at both PH 2 (very acidic) and PH 12 (very Alkaline).