PEAK® BlueDEF® is a mixture of 32.5% high purity synthetic urea and 67.5% deionized water that is used in Selective Catalytic Reduction (SCR) systems on diesel engines. DEF is the primary ingredient used to help convert NOx to harmless nitrogen and water. BlueDEF® is stable, colorless, non-flammable, and is classified as minimum risk for transportation. BlueDEF® conforms to the ISO-22241-1 specification for DEF, is API registered and meets or exceeds OEM specifications. 
PEAK® BlueDEF®’s exclusive TRIPLE-FILTERED formula ensures the highest product purity. Every batch is guaranteed pure.
| General Data | |
| Product Form: | Liquid | 
| Properties | |
| Appearance: | Colorless, clear liquid | 
| Boiling Point, °F: | >212˚ F °F | 
| Freezing Point, °F: | 12˚ F °F | 
| Odor: | Odorless | 
| Pounds/Gallons: | 9.09 | 
| Specific Gravity (Water=1): | 1.09 | 
| Vapor Density (Air=1): | 0.6 H2O >1 | 
| Vapor Pressure (mm of Hg): | Not applicable | 
| Water Solubility: | 100% | 
| Container Design: | Box |