| MCII | Irritating Potential |
| 0.0 - 0.08 | Non irritating/negligible |
| >0.08 - 0.16 | Very slight irritation |
| >0.16 - 0.50 | Slightly irritating |
| >0.50 - 1.00 | Moderately irritating |
| >1.00 - 1.60 | Strongly irritating |
| >1.60 | Very strongly irritating |