The Raschig ring packing is mainly divided into two categories from the shape structure, one type is a ring packing; the other type is a saddle ring packing. In addition, there are some small varieties of other shape fillers, such as annular fillers, flower ring fillers, etc., which are used in small quantities and applications.
According to the material, it is divided into ceramic Raschig ring, metal Raschig ring and plastic Raschig ring.
The Raschig ring is the oldest and most primitive shape of the annular packing. It is a hollow ring of equal height and diameter. It is made of ceramic material and has a wall thickness of one tenth of the outer diameter.