dianoir® is the ta-C DLC coating specially designed to meet the highest aesthetic and technical requirements of the watchmaking and jewellery industry. The anthracite-black colour is an optimal prerequisite for aesthetic applications and the hardness of 4500 HV guarantees high wear resistance even under harsh environmental conditions.


VDI abbreviation ta-C
Process PVD Arc
Structure Amorphous
sp3 fraction [%] 70
Color black-grey
Thickness 1 µm
Max. operating temperature [°C] 500
Hardness [GPa] 44
Friction coefficient 0.1

All data given are approximate values, depending on application, environment and test conditions. Coating hardness HIT [GPa] Measured by nano indentation according to ISO 14577. The hardness can be adapted to the application. Coefficient of friction (dry) versus steel determined by dry disc ball test with a steel ball according to ASTM G99. These values may be exceeded during run-in. Maximum service temperature [°C] These are approximate values.

dianoir® is produced with a deposition system for ta-C DLC coatings patented by Argor-Aljba. The main advantages are:
high wear and corrosion resistance
- uniform anthracite-black colouring
- non-toxic process and biological compatibility are optimal properties for the use of dianoir® in contact with the human skin
- special intermediate layer for perfect adhesion




dianoir® has brilliantly passed all technical tests used for the certification of coatings in the watch industry. dianoir® showed brilliant results in saline environment resistance tests, abrasion resistance tests and artificial perspiration tests.