This method is for the determination of either heptane or toluene insoluble material in petroleum oils and is applicable to samples that are fluid at about 80176;C. This method covers the range of 0.01 to about 25 mass-% insolubles. Solid particulate materials interfere. More viscous or solid materials such as asphalts may be analyzed using this method but will require using a heated sonicating bath (up to 60176;C). The data provided by this method may be used as an index to coking tendency of petroleum oils when considering their suitability as charge stocks to cracking or other processes.
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