Because of this ultra-refining depth, it is difficult to realize heavy fraction in the actual manufacturing process, so the molecular weight of white oil is usually in the range of 250-450, which belongs to lubricating oil fraction. Medical white mineral oil is a colorless, odorless and transparent liquid with special plasticity, lubricity and heat preservation, which can be made into articles for human and animals to absorb or swallow, so it can be used for the manufacture of medicines and cosmetics, the manufacture and packaging of food, and the lubrication of food production and packaging machinery. White mineral oil for industrial use has low purity and can be used in special industries such as textiles, chemicals and plastics. So there is no harm.