A manufacturer of large tanks for DEF required protection from both freezing and maximum degree temperatures. Diesel Exhaust Fluid (DEF), a urea-based solution, reduces emissions of nitrogen oxides produced by diesel engine exhausts. As the tanks are usually located outside of facilities, DEF must be kept at a minimum of 12° F, but also cannot rise above 180° F or the solution will breakdown. DEF is also a corrosive fluid and so can only come in contact with certain materials. The manufacturer needed an inexpensive solution that provided temperature protection while avoiding both corrosion and moisture issues. - Chromalox built a custom heater enclosure from 3-inch schedule 80 propylene pipe (compatible with urea-based solutions) and added a welded cap on the bottom.

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