[Code of Federal Regulations]
[Title 21, Volume 3]
[Revised as of January 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR175.390]
[Page 196]
TITLE 21--FOOD AND DRUGS
CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN
SERVICES (CONTINUED)
PART 175 INDIRECT FOOD ADDITIVES: ADHESIVES AND COMPONENTS OF
Subpart C Substances for Use as Components of Coatings
Sec. 175.390 Zinc-silicon dioxide matrix coatings.
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 Sec. 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 Sec. 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 Sec. 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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