Crystal: Used to protect the dial transparent lens, placed in the top of the watch, the general can be divided into mineral glass, plexiglass and sapphire crystal glass three.
Polymethyl methacrylate:
Abbreviated as PMMA, is a transparent organic polymer named "Polymethylmethacrylate". Is an important early thermoplastics (heat softening, cooling and hardening characteristics of plastic). Can be divided into colorless, transparent, colored and transparent, pearly and embossed plexiglass four. Also known as plastic, acrylic, gelatin glass, etc., better transparency, chemical stability, easy dyeing, good processing.
Feel the plastic touch, mostly low-end watches commonly used, the early appearance of medium-sized brands are also used, prone to scratches, but toughness, and not brittle. Do not take a hammer Kaka Knock also finished ah! Refers to the daily use is not fragile.
As people's needs grow larger and larger, a sparsely populated and difficult to extract natural crystal apparently needs a cheaper alternative, and artificial crystal glass comes into being. Commonly known as mineral glass, which is often polished and tempered glass, is a kind of crystal material made of materials such as Silica and lead oxide. It has good gloss and is very transparent. Than the plexiglass wear, but inferior to the sapphire crystal (glass), a long time a lot of scratches; anti-vertical strike capability (hardness) is stronger than the sapphire crystal, often used in military or low-end brands in the table. Cold touch, crisp percussion.
This is one of the most common material for synthetic sapphire, commonly used in the manufacture of high-end watch brands, mainly spherical and flat two kinds, and most of the inner layer of anti-glare or anti-dazzle double-sided treatment. Physical and chemical properties of stability. Should not have scratches, aging, corrosion and other issues. The disadvantage is that it can not withstand the strong impact, fragile, with its hardness of the same or higher material: sandpaper, nail file, grinding stone, concrete walls, floors and so may scratch the surface.
The most simple and crude maintenance methods:
If the table mirror worn another original and too expensive how to do? Have friends to share a great stay, economical and affordable ideas: the first step for a cheaper table mirror, the second, paste a glass film. A treasure on the cut a variety of sizes table mirror film, I was shocked directly ... ... did not look at the eye of the material can only do it yourself. (○ '· д ·) ノ
This article is reprinted from the watch era, if you have any questions, please send an email to to contact us.
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