Spiral Prismatic Packing SPP – Stainless Steel Springs for Distillation Column | A reputable and recommended product, the first quality for the distiller. Professional filling of the rectification column in the form of stainless springs. The filling is made of stainless steel 304, it has a catalytic function. Prismatic filling is the most effective filling. We calculate the volume we need for our column according to the formula ½ the diameter of the column squared times the height of the column. Technical data Material: 100% Stainless steel (304) | Diameter: 4mm | Height: 5mm Pack: 1 Liter