A. In general, there are three types of "sapphire crystal"> "minerals"> "plastic (acrylic)" (strength order)
A windshield (also called glass) that covers the dial is an important part for the watch, as the name suggests.There are several types of windshields, mainly sapphire crystals, plastic (acrylic), and minerals.
Sapphire crystal is highly hard and hard to scratch, but it is also mainly used in luxury watches because it is difficult to process.By the way, the name is named sapphire, but it is not a natural sapphire, but it is made by processing artificial sapphire.The disadvantage is that it is vulnerable to a strong impact, and if it breaks, it may be shattered.Be careful not to drop it into a hard place such as concrete, as it may damage the dial if it breaks.
Minerals are used for relatively inexpensive watches.It can be manufactured at a relatively low cost, and has the advantage of being softer than sapphire glass, making it easier to process.However, since the hardness is lower than the sapphire crystal, it has a weakness that is easy to chip and crack.In order to overcome this problem, some are coated from above.
In addition to some current models, the speedmaster is still using plastic to follow the atmosphere of the initial model.
Plastic is the oldest material.Also called acrylic.It is the lightest material among the three materials, and is the biggest feature that it is easy to process.It is mainly used for so -called antique watches from the 1940s to the 60s.Because it is not hard, it is easily scratched and has difficulty in durability.For this reason, there are many models at the time that the dome -shaped design is increased and the dome -shaped design is increased, and the strength is increased.
Sentence ◎ Yuki Matsumoto (editorial department)
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