§178.3950 四氢呋喃(Tetrahydrofuran)

��178.3950 Tetrahydrofuran
　　 Tetrahydrofuran may be safely used in the fabrication of articles intended for packaging, transporting, or storing foods, subject to the provisions of this section.

　　（a� It is used as a solvent in the casting of film from a solution of polymeric resins of vinyl chloride, vinyl acetate, or vinylidene chloride that have been polymerized singly or copolymerized with one another in any combination, or it may be used as a solvent in the casting of film prepared from vinyl chloride copolymers complying with �� 177.1980 of this chapter.

　　（b� The residual amount of tetrahydrofuran in the film does not exceed 1.5 percent by weight of film.