Sodium Xylenesulfonate

Sodium xylenesulfonate is a hydrotrope — a small anionic surfactant whose primary job is to dissolve oily fragrance compounds and other hydrophobic ingredients into water-based product formulas. It is widely used in household and automotive cleaners at concentrations of 1–5%. The molecule is readily biodegradable per OECD 301 testing and is not on the Prop 65 list. Not classified as a respiratory sensitizer (no H334), not an asthmagen, not aquatic-toxic at typical formulation concentrations. At >25% concentration it can cause skin irritation (H315), but at ≤4% in finished products this falls below the GHS classification threshold.