ISO 12205 Petroleum Products - Determination of Oxidation Stability of Medium Distilled Fuels

The ISO 12205 standard, developed by the International Standards Organization (ISO), defines a test method for the measurement of inherent stability under accelerated oxidizing conditions. This test method enables the determination of storage stability of medium distillate fuels with an initial boiling point above about 175 degrees and a 90 percent recovery point below 370 degrees. This test method does not apply to fuels containing residual components or any major component from a non-petroleum source.

Oxidation is a chemical process that results in the formation of adherent and filterable insoluble substances. Any substance, such as chromium, that catalyzes oxidation reactions causes a larger amount of insoluble matter to be formed.

For the purposes of this standard,

• Adhesive insolubles refers to the material produced during the stretching of medium distilled fuel under the conditions of this test, which adheres to the glassware after the fuel has been cleared from the system.
• The expression filterable insolubles refers to the material produced during the stretching of the medium distilled fuel under the conditions of this test, which can be separated from the fuel by filtration. This includes both material suspended in the fuel and easily removed from the oxidation cell, and the oxygen delivery tube with hydrocarbon solvent.
• The expression inherent stability refers to resistance to change when exposed to air but in the absence of water or other environmental factors such as reactive metallic surfaces or dirt.
• Total insolubles refers to the sum of sticky and filterable insolubles.
• Time zero refers to the time when the first oxidation cell is placed in the heating bath.

While testing, some of the filtered medium distilled fuel is aged at 16 degrees for 95 hours by bubbling oxygen from the sample. The sample is then cooled to about room temperature before filtration to obtain the amount of filterable insolubles. The sticky insolubles are then removed from the oxidation cell and trisolvent-associated glassware. The trisolvent is evaporated to obtain the amount of sticky insoluble substances. The sum of filterable and adherent insolubles is reported as total insolubles.

Our company, among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, also provides test services for the determination of oxidation stability of medium distilled fuels within the scope of ISO 12205 standard, with its trained and expert staff and advanced technological equipment.