1,3-propane sultone (C3H6SO3) CAS No 1120-71-4 Appearance: Clear colorless to yellowish liquid Assay: â?¥99% Melting point: 30-32C Refractive index( 40C): 1.4495-1.4505 Application: It is an important chemical intermediates. It is a starting material for brightener, sensitizing dye, anionic gemini surfactant