All flexible polyurethane foam in the form of slabs, blocks, or sheets, or which is shredded (loose or packaged), except polyurethane foam sold for use as carpet underlayment and polyurethane foam which cannot reasonably be expected to be used in or as an article of furniture or a mattress, that is offered for sale to the general public at retail outlets in this state for noncommercial or nonmanufacturing purposes, shall be fire retardant. “Fire retardant” as used in this section, means a product that meets the regulations adopted by the bureau.
Source:
Section 19161.3, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=BPC§ionNum=19161.3..