Rapeseed oil is classified into four grades according to color, odor, transparency, soap content, insoluble impurities, acid value, peroxide value and solvent residue, among which acid value, peroxide value and solvent residue are mandatory quality indicators and others are not mandatory. Refined oil is divided into four grades (the lowest of the four grades) according to the degree of compliance.

Table 6 Main indicators of rapeseed oil (mandatory requirements for refined oil)

Acid value /(mg/g) 0.20 0.30 1.0 3.0 peroxide value /(mmol/kg) 5.0 5.0 6.0 6.0 solvent residue /(mg/ Kg) (leaching method), solvent residue ≤50 ≤50 (squeezing method), source: national standard GB/rapeseed oil.