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Sulfur Technologies from DuPont

Sulfur Trioxide

Sulfur trioxide (SO3) is a clear, colorless, oily liquid, but it may contain a slight haze and appear off-white to light brown. As normally handled, SO3 and oleums have a high vapor pressure; the SO3 fumes react with the moisture in the air to produce dense, white clouds of sulfuric acid mist.

DuPont offers two grades of SO3: stabilized and unstabilized. The stabilized grade contains a small quantity of a stabilizer to retard the formation of the undesirable beta and alpha (higher-melting) forms.