REC PVA is polyvinyl alcohol. A solid, colorless, non-toxic substance, odorless. PVA-plastic is non-toxic and biodegradable and it is recommended to use it for printing auxiliary structures in objects from PLA plastic with complex geometry, which can then be easily removed. Dissolve PVA can be in a conventional bath with warm water, sometimes stirring to speed up the process. Each reel is packaged in a reusable vacuum bag with silica gel so that the plastic does not lose its properties when stored.