All crude or refined oil carried with them some inherent moisture (water) & insoluble impurities
When MNI is too excessive, there will be water separation and sedimentation, especially in crude oil
Generally speaking, crude oil conform to commercial specification as per standard trading rules are generally homogeneous with no visible or little impurities.
Refined oil MNI spec is 0.1% but generally <0.02% - anything higher than that you will see free water droplets - likely cause sampling during raining day with small umbrella
Impurities generally is about 0.02% for crude and 0.01% for refined
Standard specification for CPO - MNI 0.25% for Malaysia domestic specs but 0.5% for Indonesian CPO
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