... corrosion. 2.Acid and alkali resistant 3.High temperature resistant din 2632 welding neck flanges Welding Neck Flanges, Slip on Flanges ... , DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673B.S ... , PN 2.5 ,6,10,16,25, 40,64,100,160 ETC. Available with NACE MR 01-75 7.Production with ...