Table 2. Recommendations for the preparation of common occupational materials for the patch test.
| Substance | Concentration | Vehicle | pH* | Remark |
|---|---|---|---|---|
| Hand and skin disinfectant | Pure (50%) |
Water | ||
| Surface disinfectant (use concentration) |
0.1% 0.01% |
Water | ||
| Instrument disinfectant (use concentration) |
0.01% (0.001%) |
Water | ||
| Metalworking fluid, water-soluble, used or unused concentration ≤ 8% | Pure (50%) |
Water | X | 24-hour occlusion Store sample in a cool place pH not > 9.5 |
| Metalworking fluid, water-soluble, used or unused concentration > 8% | 50% (10%) |
Water | X | 24-hour occlusion Store sample in a cool place pH not > 9.5 |
| Metalworking fluid, water-soluble, concentrate | 5% | Water | X | 24-hour occlusion pH not > 9.5 |
| Metalworking fluid, oily | 50% (10%) |
Olive oil | ||
| Grease | Pure (20%) |
Petrolatum | ||
| Lubricating oil | 50% 10% |
Olive oil | ||
| Gear oil | 10% | Olive oil | ||
| Hydraulic oil | (50%) 10% |
Olive oil | ||
| Silicone spray | 10% | Petrolatum | ||
| Wood dust | Pure | moistened | Exotic woods 1 : 10 petrolatum |
*pH value must be checked before testing (pH value 5 – 8 is unproblematic).