§176.230 3,5-Dimethyl-1,3,5,2 H -tetrahydrothiadiazine-2-thione.
3,5-Dimethyl-1,3,5,2H- tetrahydrothi-adiazine-2-thione may safely be used as a preservative in the manufacture and coating of paper and paperboard intended for use in contact with food in accordance with the following prescribed conditions:
（a） It is used as follows:
（1） In the manufacture of paper and paperboard as a preservative for substances added to the pulp suspension prior to the sheet-forming operation provided that the preservative is volatilized by heat in the drying and finishing of the paper and paperboard.
（2） As a preservative for coatings for paper and paperboard, Provided, That the preservative is volatilized by heat in the drying and finishing of the coated paper or paperboard.
（b） The quantity used shall not exceed the least amount reasonably required to accomplish the intended technical effect and shall not be intended to nor, in fact, accomplish any physical or technical effect in the food itself.
（c） The use of a preservative in any substance or article subject to any regulation in parts 174, 175, 176, 177, 178 and § 179.45 of this chapter must comply with any specifications and limitations prescribed by such regulation for the substance or article.
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