LTTD has proven very effective in reducing concentrations of petroleum products including gasoline, jet fuels, kerosene, diesel fuel, heating oils, and lubricating oils. LTTD is applicable to constituents that are volatile at temperatures up to 1,200 °F. Most desorbers operate at temperatures between 300 °F to 1,000 °F. Desorbers constructed of special alloys can operate at temperatures up to 1,200 °F. More volatile products (e.g. gasoline) can be desorbed at the lower operating range, while semivolatile products (e.g. kerosene, diesel fuel) generally need temperatures over 700 °F, and relatively nonvolatile products (e.g., heating oil, lubricating oils) need even higher temperatures. Essentially all soil types are amenable for treatment by LTTD systems. However, different soils may require varying degrees and types of pretreatment. For example, coarse-grained soils (e.g. gravel and cobbles) may require crushing; fine-grained soils that are excessively cohesive (e.g. clay) may require shredding.