The U.S. Consumer Product Safety Commission's (Commission or CPSC) mandatory rule, Safety Standard for Portable Hook-On Chairs, incorporates by reference ASTM F1235-18, Standard Consumer Safety Specification for Portable Hook-On Chairs. In 2018, ASTM notified CPSC that it had issued a revised voluntary standard for portable hook-on chairs. In accordance with the procedures set out in section 104(b)(4)(B) of the CPSIA, this revised standard became the new mandatory standard for portable hook-on chairs (83 FR 48219, September 24, 2018). The mandatory standard currently incorporates by reference this standard (ASTM F1235-18). The currently incorporated voluntary standard (ASTM F1235-18) and the revised voluntary standard (ASTM F1235-25) are available for review in several ways.