Sapphire crystal glass easily what the situation was wear
the last watch less useful for sapphire do watch glass, and now most watches come with sapphire glass. Sapphire do watch glass is really a lot of good, not easy to be scratched and worn, because of its hardness is 9, second only to diamond.
sapphire glass will also be worn, early radar watch once said in the ad it watch is “ never wear ”, is obviously exaggerated, later changed to wear, it is almost. Indeed, sapphire glass just wear, usually something hard, often are more brittle, so, sapphire glass in the fierce collision, easily broken or crack. (see photo)
in addition, there is a sharp pointed things zoned rub to the surface of the glass, also easy to cause scratches, this should look to delimit loiter strength and speed, the contact point more sharp, speed and power of the bigger, more easy to be scratched. There is a glass the force point, around 45 degrees of stress angle, easy cause large scratches.
early (late 80's), the Swiss Rado watches manufacturers to China to sell its tungsten steel watchcase, sapphire glass watch when all the site to do performance; the watch on the ground, glass face down, and then step on one foot, the watch is leather shoes press friction, in on the ground after the experiment, the watch is wiped clean, even watchcase, watch glass intact, still so bright.
when the presence of the people, all surprised, had never seen so strong wear watches, all think so magical. Now in retrospect, I feel it is a gimmick, suspected in Louis Liu's the magic show, in fact, this is a simple physical pressure sense, the problem lies in the glass and the ground contact area is too large, the pressure and friction velocity on the feet can also be controlled by man.
I will bring the radar watch, is the arch type diamond star paragraph about has been worn for 15 years, my sapphire crystal glass edge, dotted with pits, defect, anti Er table to the side of the glass is not easy to be worn, I want to wear mainly due to watch and table surface is zoned rub a better chance of. Radar watch appearance surface is the overall sapphire glass, and is convex, the most easily damaged edge. (see photo) glass four weeks were embedded watchcase, relatively safe.
sapphire crystal glass but was caused by wear or scratches, is not through the grinding and polishing to remove, that is beyond repair, only for the new, glass flat circular better replacement, if arch or irregular, it basically looking for original parts, cost not cheap.