Heptane, Branched and Cyclic

Heptane, Branched and Cyclic (CAS 426260-76-6) is a group of C7 aliphatic hydrocarbon isomers — branched and cyclic heptane structures — used as a volatile carrier solvent in aerosol cleaning products. It appears alongside n-heptane (CAS 142-82-5) and acetone in throttle body cleaners, carb cleaners, and aerosol degreasers, where its fast evaporation rate (boiling point range near 80–100°C) and strong solvency for light oils and carbon deposits are valued.

At the ingredient level, the GHS classification includes H336 (drowsiness/dizziness from vapor inhalation — STOT SE 3), H315 (skin irritation Cat 2), H304 (aspiration hazard Cat 1), and H412 (harmful to aquatic life with long lasting effects — chronic Cat 3). In aerosol cleaning products, the H304 aspiration risk at the ingredient level is typically not carried through to the mixture-level classification (SDS §2) because the aerosol delivery format precludes the relevant ingestion-and-aspiration scenario. Confirm mixture-level §2 classification before attributing H304 to the product.

The "branched and cyclic" CAS number (426260-76-6) is a UVCB substance covering multiple isomers; it is distinct from n-heptane (CAS 142-82-5) though they often appear together in the same SDS §3.