Item | Super grade (X) | 1st grade (WW) | 2nd grade (WG) | 3rd grade (N) | 4th grade (M) | 5th grade (K) |
Color | Slightly yellow | Pale yellow | Yellow | Deep yellow | Yellow brown | Yellow red |
Appearance | Transparent | Transparent | Transparent | Transparent | Transparent | Transparent |
Softening point | ≥76℃ | ≥76℃ | ≥75℃ | ≥75℃ | ≥74℃ | ≥74℃ |
Acid value | ≥166 mgKOH/g | ≥166 mgKOH/g | ≥165 mgKOH/g | ≥165 mgKOH/g | ≥164 mgKOH/g | ≥164 mgKOH/g |
Unsaponifiable matter b | ≤5% | ≤5% | ≤5% | ≤5% | ≤5% | ≤5% |
Ash content | ≤0.030% | ≤0.030% | ≤0.030% | ≤0.030% | ≤0.040% | ≤0.040% |
Alcohol insoluble substance | ≤0.020% | ≤0.020% | ≤0.030% | ≤0.030% | ≤0.040% | ≤0.040% |