What is 'persistent oil ' ?

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In the definition adopted by the IOPC Fund, persistent oils are actually defined by describing what is meant by non-persistent oil: Oil other than non persistent is persistent.

“non-persistent oil is oil which, at the time of shipment,consists of hydrocarbon fractions,
(a) at least 50% of which, by volume, distils at a temperature of 340°C (645°F).
(b) at least 95% of which, by volume, distils at a temperature of 370°C (700°F);