Asphalines are complex aromatic and saturated hydrocarbons responsible for a commonly observed crystalline deposit found in degraded diesel fuel, which can lead to fuel filter plugging and starvation. They are awkward due to their poor solubility in non-aromatic hydrocarbons.
Similar to the methodology for isolating pentane and toluene insoluble material, the insolubles are separated from the lubricant itself and gravimetrically measured.
The likelihood of a fuel to present asphaltine deposits, atypical of long-term bunker fuel oil storage, which can spell disaster for the vehicles it is eventually utilised in.
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