§178.3930 萜烯树脂(Terpene resins)

��178.3930 Terpene resins


　　 The terpene resins identified in paragraph （a� of this section may be safely used as components of polypropylene film intended for use in contact with food, and the terpene resins identified in paragraph （b� of this section may be safely used as components of polyolefin film intended for use in contact with food;

　　（a� Terpene resins consisting of the hydrogenated polymers of terpene hydrocarbons obtainable from sulfate turpentine and meeting the following specifications: Drop-softening point of 118��-138 ��C; iodine value less than 20.

　　（b� Terpene resins consisting of polymers of beta-pinene and meeting the following specifications: Acid value less than 1; saponification number less than 1; color less than 4 on the Gardner scale as measured in 50 percent mineral spirits solution.