N.Y.C. Admin. Code § 28-113.2.4: § 28-113.2.4 Material not listed or labeled.

Whenever this code or the rules of the department requires that material be listed or labeled to a standard and material proposed to be used is not so listed or labeled, the use of such material shall be subject to prior approval by the commissioner and such material shall be used only to the extent set forth in such approval.