Persistent Oil
Persistent Oil
Persistent Oils generally contain a considerable proportion of heavy fractions or high-boiling material.
Persistent Oil is defined as “a petroleum-based oil that does not meet the distillation criteria for nonpersistent oils (see below).”
Persistent oils are further classified based on specific gravity, as follows:
• Group II – Specific gravity less than .85 crude [API° >35.0]
• Group III – Specific gravity between .85 and less than .95 [API° ≤35.0 and >17.5]
• Group IV – Specific gravity between .95 to and including 1.0 [API° ≤17.5 and >10.0]
• Group V – Specific gravity greater than 1.0 [API° ≤10.0]
• Group II – Specific gravity less than .85 crude [API° >35.0]
• Group III – Specific gravity between .85 and less than .95 [API° ≤35.0 and >17.5]
• Group IV – Specific gravity between .95 to and including 1.0 [API° ≤17.5 and >10.0]
• Group V – Specific gravity greater than 1.0 [API° ≤10.0]
Non Persistent Oil
Nonpersistent Oils are those that are generally of a volatile nature and are composed of lighter hydrocarbon fractions, which tend to dissipate rapidly through
evaporation.
Nonpersistent or Group I Oil is defined as “a petroleum-based oil that, at the time of shipment, consists of hydrocarbon fractions:
• At least 50% of which, by volume, distill at a temperature of 340°C (645°F); and
• At least 95% of which, by volume, distill at a temperature of 370°C (700°F).”
Indicated in MIRACLE Overview Physical Properties
