The existing information supports the use of this material as described in this safety assessment. 4-(4-Methyl-3-penten-1-yl)-2(5H)-furanone was evaluated for genotoxicity, repeated dose toxicity, reproductive toxicity, local respiratory toxicity, photoirritation/photoallergenicity, skin sensitization, and environmental safety. Data show that 4-(4-methyl-3-penten-1-yl)-2(5H)-furanone is not mutagenic. The clastogenicity endpoint was evaluated using the Threshold of Toxicological Concern (TTC) for the genotoxicity endpoint material, and the exposure to 4-(4-methyl-3-penten-1-yl)-2(5H)-furanone is below the TTC (0.0025 μg/kg/day). The repeated dose, reproductive, and local respiratory toxicity endpoints were evaluated using the TTC for a Cramer Class III material, and the exposure to 4-(4-methyl-3-penten-1-yl)-2(5H)-furanone is below the TTC (0.0015 mg/kg/day, 0.0015 mg/kg/day, and 0.47 mg/day, respectively). The skin sensitization endpoint was completed using the Dermal Sensitization Threshold (DST) for reactive materials (64 μg/cm2); exposure is below the DST. The photoirritation/photoallergenicity endpoints were evaluated based on ultraviolet/visible (UV/Vis) spectra; 4-(4-methyl-3-penten-1-yl)-2(5H)-furanone is not expected to be photoirritating/photoallergenic. The environmental endpoints were evaluated; for the hazard assessment based on the screening data, 4-(4-methyl-3-penten-1-yl)-2(5H)-furanone is not Persistent, Bioaccumulative, and Toxic (PBT) as per the International Fragrance Association (IFRA) Environmental Standards. For the risk assessment, 4-(4-methyl-3-penten-1-yl)-2(5H)-furanone was not able to be risk screened as there were no reported volumes of use (VoU) for either North America or Europe in the 2019 IFRA Survey.
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