Xylene (mixed isomers)

Xylene (mixed isomers, CAS 1330-20-7) is an aromatic hydrocarbon co-solvent commonly used in petroleum-based coatings, dressings, and detailing products. It provides solvency for silicone and aminosiloxane film-formers and contributes to rapid film formation as it evaporates. The mixed-isomer form contains ortho-, meta-, and para-xylene fractions.

As a high-VOC aromatic solvent, xylene is regulated under SARA Section 313 and California's Air Resources Board regulations. At ingredient levels of 1–5% in a multi-solvent coating formula, it contributes to the product's overall VOC profile alongside toluene and Stoddard solvent. The primary exposure concern in consumer use is inhalation during application in enclosed spaces; outdoor or well-ventilated use substantially reduces risk. CNS narcotic effects (dizziness, headache) can occur at elevated inhalation concentrations.

Aquatically toxic at substance level; the H411 chronic aquatic classification at ingredient concentration is diluted at product level but contributes to the mixture's H412 (chronic aquatic Cat 3) classification. Aerobically biodegradable in surface water; not persistent in well-oxygenated environments.