Review of the Traser Classic Automatic

If you hit it with sufficient force, however, you can go through the PVD and into the material below, and since it's still a coating, polishing to remove scratches is not recommended.Another more advanced technique is Chemical Vapor Deposition, or CVD. The main difference between PVD and CVD is that the deposited material is produced via a chemical reaction instead of directly coating the su***ce. The titanium nitride hardening on the Citizen PMT56-2711 that I reviewed is the product of CVD, and holds up extremely well.Better still is DLC, or diamond-like Carbon, where, via secret-sauce processes, the su***ce of a watch is coated with something very much like synthetic diamond! With an incredible su***ce hardness, this is very nearly impossible to scratch, and can been seen on some high-end Citizens like the Attesa, on the Casio MR-G watches, and on watches like the Rado V10K.This combination makes titanium a great material for dive watches, however one drawback is that its su***ce hardness is relatively low which means it's easily scratched.One method that can be used to change the su***ce properties of a material is called Physical Vapor Deposition, or PVD (you'll also see it labeled as Ion Plating, or IP, which is a variant on PVD). The PVD process involves placing the item to be coated in an inert (non-reactive) atmosphere, heating it up to 400° C or so (depending on the process), and basically spraying it with the molecules that you want to coat it with. That's the general process, however there are a lot of subtle variations like using charged ions for the ion plated variation. PVD has been around since 1838 and is heavily used in semiconductor manufacturing, automobiles, and many other places including, or course, watches.