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Heptane Insolubles (Asphaltines)

Method
Standards

What is it used for?

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.

 

How does it work?

Similar to the methodology for isolating  pentane and toluene insoluble material, the insolubles are separated from the lubricant itself and gravimetrically measured.

 

What do the results tell us?

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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