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Code of Federal Regulations Title 21. Food and Drugs § 21.175.390 Zinc-silicon dioxide matrix coatings

Current as of January 02, 2025 | Updated by Findlaw Staff

Zinc-silicon dioxide matrix coatings may be safely used as the food-contact surface of articles intended for use in producing, manufacturing, packing, processing, preparing, treating, packaging, transporting, or holding food, subject to the provisions of this section;

(a) The coating is applied to a metal surface, cured, and washed with water to remove soluble substances.

(b) The coatings are formulated from optional substances which include:

(1) Substances generally recognized as safe.

(2) Substances for which safe conditions of use have been prescribed in § 175.300.

(3) Substances identified in paragraph (c) of this section, subject to the limitations prescribed.

(c) The optional substances permitted are as follows:

List of substances

Limitations

Ethylene glycol

As a solvent removed by water washing.

Iron oxide

Lithium hydroxide

Removed by water washing.

Methyl orange

As an acid-base indicator.

Potassium dichromate

Removed by water washing.

Silica gel

Sodium silicate

Zinc, as particulate metal

(d) The coating in the finished form in which it is to contact food, when extracted with the solvent or solvents characterizing the type of food, and under the conditions of its intended use as shown in table 1 and 2 of § 175.300(d)(using 20 percent alcohol as the solvent when the type of food contains approximately 20 percent alcohol) shall yield total extractives not to exceed those prescribed in § 175.300(c)(3);  lithium extractives not to exceed 0.025 milligram per square inch of surface;  and chromium extractives not to exceed 0.05 microgram per square inch of surface.

(e) The coatings are used as food-contact surfaces for bulk reusable containers intended for storing, handling, and transporting food.

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Cite this article: FindLaw.com - Code of Federal Regulations Title 21. Food and Drugs § 21.175.390 Zinc-silicon dioxide matrix coatings - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-21-food-and-drugs/cfr-sect-21-175-390/

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