... the preparation of pure formaldehydeAgricultural chemicals: Paraformaldehyde used for production of herbicide, pesticide and bactericide, ... resin,high concentration resin etc.Others: Paraformaldehyde used for the paper making, the production of vitamin A, spiceries ... formaldehyde in synthetic resin, surfactant, plastics, rubber, leather, paper making, dyes, pharmacy, farm chemicals, films, detonators, ...