§177.2510 �?,1-二氟乙烯树脂(Polyvinylidene fluoride resins)

��177.2510 Polyvinylidene fluoride resins


　　 Polyvinylidene fluoride resins may be safely used as articles or components of articles intended for repeated use in contact with food, in accordance with the following prescribed conditions:

　　（a� For the purpose of this section, the polyvinylidene fluoride resins consist of basic resins produced by the polymerization of vinylidene fluoride.

　　（b� The finished food-contact article, when extracted at reflux temperatures for 2 hours with the solvents distilled water, 50 percent （by volume� ethyl alcohol in distilled water, and n- heptane, yields total extractives in each extracting solvent not to exceed 0.01 milligram per square inch of food-contact surface tested; and if the finished food-contact article is itself the subject of a regulation in parts 174, 175, 176, 177, 178 and �� 179.45 of this chapter, it shall also comply with any specifications and limitations prescribed for it by that regulation. （Note: In testing the finished food-contact article, use a separate test sample for each required extracting solvent.（�/p>

　　（c� In accordance with good manufacturing practice, finished food-contact articles containing the polyvinylidene fluoride resins shall be thoroughly cleansed prior to their first use in contact with food.