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- Physical appearance: black-violet color
- A special coat for machining abrasive materials (cast iron, AlSi) and/or for working
at high temperatures, i.e. in applications without coolant or with limited coolant
facilities, such as deep or small diameter holes.
- Of importance is hat the A-coat only achieves performance increases at higher machining rates.
- Body materials: HSS, HSCO, M42, PM HSS-E, carbide
- Coating process: sputtering (PVD)
- Symbol:
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