Octane

Octane (CAS 111-65-9) is a straight-chain C8 alkane that shows up as a trace-level component — usually well under 1% by weight — in some petroleum-distillate aerosol formulas, alongside heptane, propane, and butane. It is not a primary active ingredient; its presence reflects the natural hydrocarbon-chain distribution of the crude petroleum-distillate fraction the formula is built on, rather than a deliberately dosed additive.

Toxicologically, octane behaves like other light aliphatic hydrocarbons: high vapor concentrations can cause mild central-nervous-system depression (dizziness, headache) and skin or eye irritation, but it carries no aspiration-hazard (H304), sensitization, or carcinogenicity classification of its own in typical SDS ingredient tables. It is not listed on California's Proposition 65.

Environmentally, octane's SDS ecotoxicity data (water flea EC50 near 0.38 mg/L at 48 hours) supports an aquatic-toxicity flag, and its log Kow (partition coefficient) of roughly 5.18 sits right at the conventional bioaccumulation threshold — the reason it is flagged bioaccumulative in scoring even though its trace concentration limits real-world exposure. It biodegrades readily and is not environmentally persistent.