Oxidation Stability. This test may be interpreted in two ways. If the product has a definite "break
point," then uniform decreases in time will be used as a deterioration indicator. For example, say the break
point drops steadily from 540 minutes to 480 minutes. This pattern of decreasing time will serve as a
deterioration indicator. Secondly, some products may have a long, slow oxidation without ever reaching
break point. Should this occur, the steady rise in existent gum would be used as an indicator of deterioration.
Stock rotation policy should be based on the interpretation of these results.
Electrical Conductivity of Aviation Fuel Containing a Dissipation Additive. The level of
anti-static additive (ASA) and static dissipator additive (SDA) must be constantly maintained since both AS
and SDA readily "plate-out" of products. The additive is also affected by temperature, movement, and
storage conditions. Loss of this additive is extremely dangerous due to static discharge of the treated
product when mixed with low or non-treated products.
Distillation of Petroleum Products. High IBP/10% distillation results indicate deterioration. The
distillation test helps to correlate many other laboratory tests. For instance, a MOGAS sample with low RVP,
high IBP, and 10% distillation results, normal 90% and end point results would indicate deterioration due to
weathering.
Lead Test/Octane Numbers. Low lead test results and corresponding low octane or performance
numbers show deterioration due to a loss of additives.
Foam Test. High foam results can show loss of anti-foaming additives due to deterioration.
2-3
QM 5182
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