Tetrabond™ is an enhanced arc technology based on the Physical Vapor Deposition (PVD) process. The proprietary arc process has been developed by Ionbond and allows deposition of extremely hard, very smooth, hydrogen-free diamond like carbon (DLC) films. Tetrabond™ coatings are deposited at a temperature below 150 °C with a typical thickness range of 0.4 – 1.5 µm. Tetrabond™ coatings have a very high sp3 ratio, ranging from 80 to 90%. The sp3 bonding is typical of natural diamond. Studies have shown that sp3 fractions are directly related to film hardness. Measurements revealed a hardness in the range of 70 to 90 GPa, which is similar to that of CVD diamond film. Abrasion resistance is also comparable to that of CVD diamond film. The primary application of Tetrabond™ coatings is the surface treatment of cutting tools for machining non ferrous materials. Tetrabond™ has demonstrated excellent performance in machining aluminum, graphite, copper, FR4 PCB board and composite materials as well as wood, plastics, epoxies and certain grades of titanium. Ionbond has developed a safe de-coating process which allows for reconditioning and re-coating of expensive tools.