| C-23 | Cleaning Prior to Heat Treatment Aluminum | Chemical Processing |
| Supercedes: None | Superceded By: None |
| Number | Name | State | Country |
| 90174381 | Align Precision 597 North 1500 West | UT | United States |
| 90024576 | Astro Aluminum Treating Co. Inc. | CA | United States |
| 90053657 | Valco Manufacturing Company | OK | United States |