PART 1233—SAFETY STANDARD FOR PORTABLE HOOK-ON CHAIRS Authority: 15 U.S.C. 2056a. Source: 81 FR 17065, Mar. 28, 2016, unless otherwise noted. § 1233.1 Scope. This part establishes a consumer product safety standard for portable hook-on chairs. § 1233.2 Requirements for portable hook-on chairs. Each portable hook-on chair must comply with all applicable provisions of ASTM F1235-25, Standard Consumer Safety Specification for Portable Hook-On Chairs, http://www.astm.org/. https://www.archives.gov/federal-register/cfr/ibr-locations.html. [91 FR 15540, Mar. 30, 2026]