International Oil Pollution Compensation (IOPC) Fund definition:
“A 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 340ºC (645ºF) and (b) at least
95% of which, by volume, distils at a temperature of 370ºC (700ºF)
when tested by the ASTM Method D-86/78 or any subsequent revision
thereof”.