16 C.F.R. § 1640.5 – Requirements.

(a) In general. All upholstered furniture must comply with the requirements in the California standard, Technical Bulletin (TB) 117-2013, “Requirements, Test Procedure and Apparatus for Testing the Smolder Resistance of Materials Used in Upholstered Furniture,” June 2013 (incorporated by reference § 1640.6).
(b) Preemption. Notwithstanding section 16 of the Flammable Fabrics Act (15 U.S.C. 1203) and section 231 of the Consumer Product Safety Improvement Act of 2008 (15 U.S.C. 2051 note), and except as provided in sections 1374, 1374.2, and 1374.3 of 4 California Code of Regulations (CCR) (except for subsections (b) and (c) of section 1374 of that title) (incorporated by reference § 1640.6) or the California standard, no State or any political subdivision of a State may establish or continue in effect any provision of a flammability law, regulation, code, standard, or requirement that is designed to protect against the risk of occurrence of fire, or to slow or prevent the spread of fire, with respect to upholstered furniture.
(c) Preservation of certain State law. Nothing in Public Law 116-260 or the Flammable Fabrics Act (15 U.S.C. 1191 et seq.) and section 231 of the Consumer Product Safety Improvement Act of 2008 (15 U.S.C. 2051 note), may be construed to preempt or otherwise affect:
1. (1) Any State or local law, regulation, code, standard, or requirement that—
  1. (i) Concerns health risks associated with upholstered furniture; and
  2. (ii) Is not designed to protect against the risk of occurrence of fire, or to slow or prevent the spread of fire, with respect to upholstered furniture;
2. (2) Sections 1374, 1374.2, and 1374.3 of 4 CCR (except for subsections (b) and (c) of section 1374 of that title), as in effect on the date of enactment of Public Law 116-260; or
3. (3) The California standard.