- Black oxide finish can be performed on steel, stainless steel, cast iron, copper and brass
- Black oxide finish produces:
- No dimensional changes
- No chipping
- Retains surface properties
- Absorbs oil and wax
- Finish can be exposed to heat without fading
- Work finished and tested to the following specifications in-house.
TRB/Andarn has capability to perform and certify finishing to the following specifications
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| Mil-C-13924D | Mil-Std-171D | Mil-F 14072 | AMS 2485F | Mil-STD-186D | Other | |
| Carbon/Cold rolled steel | Class I | 3.3.1.2 | 214 | |||
| Cast Iron | Class I | 3.3.1.2 | 214 | |||
| Stainless steel | Class 4 | 3.3.2.1 3.3.4.1 | ||||
| Copper/ Brass/Bronze | 3.2 | E311 | 213 | Mil-F-495E | ||
| Salt Spray(class 4)/Oxalic Acid Test(Class 1 and 2 only) | ||||||
| Smut Test | Yes | Yes | Yes | Yes | Yes | |