15 USC 1203 - Preemption of Federal standards
Except as provided in subsections (b) and (c) of this section, whenever a flammability standard or other regulation for a fabric, related material, or product is in effect under this chapter, no State or political subdivision of a State may establish or continue in effect a flammability standard or other regulation for such fabric, related material, or product if the standard or other regulation is designed to protect against the same risk of occurrence of fire with respect to which the standard or other regulation under this chapter is in effect unless the State or political subdivision standard or other regulation is identical to the Federal standard or other regulation.
The Federal Government and the government of any State or political subdivision of a State may establish and continue in effect a flammability standard or other regulation applicable to a fabric, related material, or product for its own use which standard or other regulation is designed to protect against a risk of occurrence of fire with respect to which a flammability standard or other regulation is in effect under this chapter and which is not identical to such standard or other regulation if the Federal, State, or political subdivision standard or other regulation provides a higher degree of protection from such risk of occurrence of fire than the standard or other regulation in effect under this chapter.
In determining the burden, if any, of a State or political subdivision flammability standard or other regulation on interstate commerce the Commission shall consider and make appropriate (as determined by the Commission in its discretion) findings on the technological and economic feasibility of complying with such flammability standard or other regulation, the cost of complying with such flammability standard or other regulation, the geographic distribution of the fabric, related material, or product to which the flammability standard or other regulation would apply, the probability of other States or political subdivisions applying for an exemption under this subsection for a similar flammability standard or other regulation, and the need for a national, uniform flammability standard or other regulation under this chapter for such fabric, related material, or product.
In this section, a reference to a flammability standard or other regulation for a fabric, related material, or product in effect under this chapter includes a standard of flammability continued in effect by section 11 of the Act of December 14, 1967 (Public Law 90189).