... :stainless steel, carbon steel, aluminum, bronze, 304L, 316L, and other alloy Welcome to our website:www.fxsino.comSteel pall ring introduction: ... the most common and well known packing,It was designed based on Raschig Ring by German BASR company in 1940s. The ... than Raschig Ring.Material: Metal Pall rings are available in a wide range of materials such as stainless steel, carbon steel, aluminum, ...