Aliphatic Hydrocarbon (Hydrotreated Light)

Aliphatic hydrocarbon (CAS 64742-89-8) is a hydrotreated light petroleum distillate — a refinery fraction composed primarily of C9–C12 aliphatic and cycloaliphatic hydrocarbons with most aromatic content removed by hydrotreatment. It appears in SDS Section 3 of solvent-based coatings, aerosol products, and degreasers as a carrier or co-solvent.

The H304 (aspiration hazard) classification at the ingredient level is characteristic of low-viscosity petroleum distillates — the low surface tension allows rapid lung penetration if ingested. This H-code frequently appears in ingredient-level SDS data but may not propagate to the mixture-level §2 classification if the concentration is below the mixture classification threshold.

Differentiated from other aliphatic CAS numbers by the "hydrotreated" designation — specifically, hydrotreating has removed most of the aromatic content (benzene, toluene, xylene) that would otherwise drive H315 skin irritation and potential Prop 65 classifications. This makes it a lower-toxicity carrier compared to non-hydrotreated naphtha fractions.