Hydrocarbons, C10-C13, n-alkanes, iso-alkanes, cyclenes, <2% aromatics

C10-C13 hydrocarbons (n-alkanes, iso-alkanes, cyclenes) are a petroleum-distillate solvent fraction commonly used in metal polishes, chrome polishes, and surface care products as the primary carrier. The chain-length range gives these solvents moderate volatility — slower evaporation than lighter naphtha fractions (C7-C9) but faster than heavier mineral spirits. This produces the characteristic moderate solvent smell during metal polish application.

At ingredient level, the C10-C13 fraction typically carries H304 (aspiration hazard — fatal if swallowed and enters airways) and H412 (Aquatic Chronic 3). Whether H304 propagates to the product mixture classification depends on the CLP viscosity exemption and concentration threshold — products where SDS §11 confirms aspiration hazard is not classified at the mixture level do not receive the H304 health deduction.

Environmentally, the aquatic-chronic classification (H412) at the ingredient level warrants inclusion as an ingredient-level aquatic toxicity deduction in the environment score, even when the mixture classification does not carry a corresponding aquatic code.