Vapor Presure <1 mm Hg ( 20 °C) Vapor Density 3.1 (vs air) Appearance Clear Viscous Liquid Specific Gravity 1.265 (15/15℃)1.262 Color APHA: ≤10 Odor Odorless. Exposure Limit OSHA: TWA 15 mg/m3; TWA 5 mg/m3 Maximum wavelength(λmax) ['λ: 260 nm Amax: 0.05', , 'λ: 280 ...