CPVC is resistant to many acids, bases, salts, paraffinic hydrocarbons, halogens and alcohols. Both types are paraffinic and low in sulfur. The oil gravity is 43.3, and is paraffinic. Energy JH S.A. Honeywell's UOP processed the oil into Bio-SPK (Synthetic Paraffinic Kerosene). Creosotes from vertical-retort and low temperature tars contain, in addition, some paraffinic and olefinic hydrocarbons. Some examples of drop-in biofuels include biobutanol, biodiesel, synthetic paraffinic kerosine, and other synthetic fuels. In 1990, the Paraffinic Solvent Froth Treatment (PSFT) was developed with research contributed by CanmetENERGY.