手表的表镜、表壳和表带的材质有几种类别 / There are several categories of materials for the mirror, case and strap of a watch

      表镜按材质基本可分为塑胶镜、石英玻璃镜、蓝宝石镜等三类。胶镜相对不怕摔，但易磨损，蓝宝石表镜耐磨。表壳，表带的材料常见的有塑料，铜，不锈钢，钨钛合金，高科技陶瓷，金等。

       蓝宝石玻璃，钨钛合金和高科技陶瓷是不易磨损的材料，它们的硬度分别可达莫氏9级，8级，7级。这些材料虽能不易磨损，但却不能承受强力撞击，同时一些硬度相同或更高的物质，例如钻石，刚玉，氧化金属，石英水晶都有可能损坏这些材料。 

       磨石，砂纸，指甲挫，花岗石面，混凝土墙面及地面等均含有以上物质，会刮花这些材料的表面。表壳，表带需经常清洁，手表要避免接触各种化学特品，一旦碰到，要及时清洗干净，以免引起镀层变色，脱落等。

      Table mirrors can be basically divided into three categories: plastic mirrors, quartz glass mirrors, and sapphire mirrors. The plastic mirror is relatively not afraid of falling, but it is easy to wear and tear, and the sapphire mirror is wear-resistant. The common materials of the case and strap are plastic, copper, stainless steel, tungsten titanium alloy, high-tech ceramics, gold, etc.

      Sapphire glass, tungsten-titanium alloy and high-tech ceramics are materials that are not easy to wear, and their hardness can reach Mohs 9, 8, and 7 respectively. Although these materials are not easy to wear, they cannot withstand strong impacts. At the same time, some materials with the same or higher hardness, such as diamond, corundum, oxidized metal, and quartz crystal, may damage these materials.  

      Grinding stones, sandpaper, nail files, granite surfaces, concrete walls and floors all contain the above substances, which will scratch the surface of these materials. The case and strap need to be cleaned frequently. The watch should avoid contact with various special chemicals. Once it is encountered, it should be cleaned in time to avoid discoloration and shedding of the coating.