If the Director finds that, because of the size of the package involved or because of the minor hazard presented by the substance contained therein, or for other good and sufficient reasons, full compliance with the labeling requirements otherwise applicable under this Act is impracticable or is not necessary for the adequate protection of the public health and safety, the Director shall promulgate regulations exempting such substance from these requirements to the extent he determines to be consistent with adequate protection of the public health and safety, or if the Director finds that the requirements of this Act are not adequate for the protection of the public health and safety in view of the special hazard presented by any particular hazardous substance, he may by regulation establish such reasonable variations or additional label requirements as he finds necessary for the protection of the public health and safety; and any such hazardous substance intended, or packaged in a form suitable, for use in the household or by children, which fails to bear a label in accordance with such regulations shall be a misbranded hazardous substance; and,
     Further, whenever in the judgment of the Director such action will promote the objectives of this Act by avoiding or resolving uncertainty as to its application, the Director may by regulation declare to be a hazardous substance, for the purposes of this Act, any substance or mixture of substances which he finds meets the requirements of Section 2-4.