This Act [the Consumer Product Safety Act] shall not apply to any consumer product if: (1) It can be shown that such product is manufactured, sold, or held for sale for export from the United States (or that such product was imported for export), unless (A) such consumer product is in fact distributed in commerce for use in the United States, or (B) the Commission determines that exportation of such product presents an unreasonable risk of injury to consumers within the United States, and (2) such consumer product when distributed in commerce, or any container in which it is enclosed when so distributed, bears a stamp or label stating that such consumer product is intended for export; except that this Act shall apply to any consumer product manufactured for sale, offered for sale, or sold for shipment to any installation of the United States located outside of the United States.

The following acts and the causing thereof are hereby prohibited: (a) The introduction or delivery for introduction into interstate commerce of any misbranded hazardous substance or banned hazardous substance. *  *  * (c) The receipt in interstate commerce of any misbranded hazardous substance or banned hazardous substance and the delivery or proffered delivery thereof for pay or otherwise.

No person shall be subject to the penalties of this section *  *  * (3) for having violated subsection (a) or (c) of section 4 with respect to any hazardous substance shipped or delivered for shipment for export to any foreign country, in a package marked for export on the outside of the shipping container and labeled in accordance with the specifications of the foreign purchaser and in accordance with the laws of the foreign country, but if such hazardous substance is sold or offered for sale in domestic commerce, or if the Consumer Product Safety Commission determines that exportation of such substance presents an unreasonable risk of injury to persons residing within the United States, this clause shall not apply.