... chloride monomer for cracking tubes, return bends and inlet and outlet flanges. Chemical composition (%):C: 0.05-0. ... catalyst tubing, convection tubing, pigtails, outlet manifolds, and quenching-system piping.Ethylene, Oxy Alcohol, Vynil Chloride ... monomer production - heater tubing, convection and cracking tubes, and pigtails, tubing in hydrogenation heaters, Heat treating furnaces ...