HP DEF (Diesel Exhaust Fluid) is a premium-grade Aqueous Urea Solution (AUS 32) formulated in accordance with ISO 22241 and IS 17042 (Part 1) specifications. It is a high-purity, non-toxic, and colorless fluid specifically engineered for use in diesel engines equipped with Selective Catalytic Reduction (SCR) technology. HP DEF plays a critical role in reducing harmful nitrogen oxide (NOx) emissions — one of the major pollutants produced during diesel combustion — by chemically converting them into harmless nitrogen and water vapor.
| Test Characteristics | UOM | Specifications | Test Method |
|---|---|---|---|
| Aldehyde | PPM | 0-5 | ISO 22241-2 Annex F |
| Alkalinity as NH3 | % | 0-0.2 | ISO 22241-2 Annex D |
| Biuret | % | 0-0.3 | ISO 22241-2 Annex E |
| Density @ 20°C | Kg/m³ | 1087.0-1093.0 | ISO 12185 |
| Insoluble | PPM | 0-20 | ISO 22241-2 Annex G |
| RI @ 20°C | – | 1.3814-1.3843 | ISO 22241-2 Annex C |
| Urea content | % | 31.8-33.2 | ISO 22241-2 Annex B or C |
