Is the glass of a watch an insulator?

1. Introduction to watch and glass.

Looking glass: The fully transparent lens on the surface of the watch, also known as the watch glass, is used to protect the watch surface (dial). Watches can be divided into three categories: plastic mirrors, quartz glass mirrors, and sapphire mirrors according to their materials.

Rubber mirrors are relatively resistant to falls, while sapphire crystals are the most resistant to wear and tear.

2. Watch crystal: sapphire crystal glass.

Introduction to sapphire crystal watch crystal.

Sapphire mirror is a kind of crystal mirror glass produced by artificial compression, which has the advantage of high relative density and is not easy to scratch. The hardness of the sapphire crystal is second only to the hardness of diamonds, with a hardness of 2200-2300 Wilds (seven times the hardness of steel) and a hardness of 9 on the Mohs scale. However, it also has a shortcoming, that is, it is not shockproof, and it is not suitable for improper operations such as bumps, heavy pressures, and heavy falls.

If your watch falls to the ground or is struck, the sapphire crystal is highly susceptible to cracks.

Sapphire crystal watch crystal care.

The sapphire crystal does not require much maintenance, and dust and fingerprints can be wiped with a soft cloth. Be careful of oil stains, though.

Sapphire crystal watch crystal identification.

If it is a regular brand watch, sapphire glass is generally printed on the back cover of the watch, in English sapphire or sapphire crystal representation, even if it is a fake or counterfeit watch, the use of sapphire watch glass is also very common. To test the hardness of the watch glass, you can use sharp metal objects to scratch the edge of the watch glass at the most inappropriate eye, it feels very hard, there is a feeling of metal objects floating over, and the glass is not scratched, it should be sapphire glass.

Sapphire is a type of natural diamond, which has high anti-wear and anti-corrosion effects when synthesized with alumina. The hardness is 2200-2300 Domains (seven times the hardness of steel), Mohs hardness is 9, its hardness is second only to diamond, high hardness, good luminous flux, low friction, high temperature resistance, anti-wear, it can solve the problems of scratching, aging, corrosion, etc., but it is fragile. It is often used as a watch glass and a see-through case back.

Some sapphire mirrors have an anti-glare film, which can be scratched when rubbed).

The mirror coating of the watch is used to emit glare. To put it simply, the anti-glare mirror is to electroplate a multi-layer film on the lens to make it adhere to the lens to prevent light refraction, similar to car heat insulation paper, also known as multi-layer film or color coat, often used in professional aviation, diving watches or watches with a large mirror arc.

The difference is that the former is electroplated on both the inside and outside of the lens, and the latter is only coated on the inside of the glass, and the effect of the two is not much different.

Among the currently available optical thin film materials, the refractive index of magnesium fluoride (MGF2) is about the smallest, but the reflectivity of light can be reduced from 4 by using magnesium fluoride coating.

At the same time, the transmittance is increased, and of course, in order to improve the transmittance, multi-layer coating can also be used to increase the transmittance, that is, the coating is applied on both the inside and outside of the glass.

Especially for watches with large glass diameter and curvature, it is more necessary to increase the coating treatment, and the coating cannot completely eliminate the reflection, but can only reduce it.

Some watches will create a mark to indicate that the watch glass is coated, such as Omega watches, which are represented by a circle with an A letter inside the card or tag of the watch.

The one with AA means that the watch glass is coated on both the inside and outside. There are many reflective points on the watch, including the case, dial, and watch hands, which are either golden or silvery, so the coating is also one of the measures to make it more convenient to wear the watch.

The effect of the film on the surface of the hand is equivalent to the film of the mobile phone, which is to prevent scratches on the surface.

To put it simply, it is to coat the dial of your watch with a coat of film.

Its effect is similar to applying a film to a mobile phone, which is anti-scratch and anti-friction, and can also make your watch brighter and less prone to dust.

It is a method of vacuum ion plating, which has no waste water discharge, is absolutely environmentally friendly, and is more than 5 times more wear-resistant than gold plating of the same thickness. Generally, after titanium plating, the surface will be covered with a golden protective film, which looks the same as gold, beautiful and environmentally friendly.

The surface is easy to bruise, easy to scratch, there is no way to take pictures, my son bought it for me, it was scratched and cracked in just a few months.

This friend asked about the point, and their mirror is set with a sapphire mirror, which can only be scratched by the hardness of a diamond, and the transparency is still very high. Your girlfriend is very attentive.

Glass: Protects the surface, generally with an anti-glare coating to avoid reflection.

Advantages: high hardness, good light permeability, high temperature resistance, anti-wear.

Disadvantages: high cost, brittleness, no shockproof, not suitable for bumping, heavy pressure, heavy fall and other inappropriate operations.

Mineral crystal glass: also known as mineral glass, the English logo "hardend glass" Mohs hardness grade 5-6.

Advantages: low cost, light lenses.

Disadvantages: poor anti-wear ability, afraid of falling.

Plastic glass: it is acrylic, also known as safety glass.

Advantages: low cost, elastic, not easy to break.

Disadvantages: poor transparency, slightly yellow color, easy to scratch, poor wear resistance.

Sapphire crystal generally refers to synthetic sapphires, which are very different from natural sapphire, which is commonly understood as jewelry, and is generally used in the manufacture of watch mirrors. It is a wear-resistant material along with tungsten titanium alloy and high-tech ceramics. These materials are resistant to wear but cannot withstand strong impacts, and some substances of the same or greater hardness (e.g

Grinding stones, sandpaper, nail chips, granite surfaces, concrete walls and floors, etc.) can scratch the surface of these materials.

For the most part, because they are convex lenses, some are just flat glasses and do not magnify.

1. You can pick a drop of water and drop it on the glass, if it is a sapphire glass, the water droplets will not disperse, if it is not a sapphire glass, the water droplets will disperse.

2. The sapphire crystal is also smooth when gently scraped with a fingernail.

3. You can also use glass and crystal to engrave the lens, and the real sapphire will not leave traces!

There are 6 ways to identify the sapphire crystal of a watch, namely observation, exhalation, light percussion, dripping, touching, and scratching.

1. Observation.

2. Heqi method.

Breathe on the crystal of the watch, the fog quickly disperses is the sapphire mirror, generally speaking, the mirror fog will disperse when you remove the mouth from the top of the crystal after breathing.

3. Light percussion.

Gently tap the sapphire crystal of your watch with your fingernail, if the sound is dull is normal, but if the sound is crisp, it is not a sapphire crystal.

4. Drip method.

A drop of water is placed on the crystal of the watch, and the crystal does not spread the water droplets is made of sapphire glass. Or put a drop of water on the watch glass, stand up the watch, and the water droplets roll down in the shape of a small ball, which is the sapphire mirror.

5. Touch method.

When wearing a sapphire crystal watch, touch the sapphire glass with a touch of **, and you will feel a cold sensation that other glasses do not have.

6. Scraping method.

If you scratch the crystal with your fingernails and feel smooth and resistance-free, it is the sapphire mirror; It is also possible to use a sharp metal object to scratch the edge of the crystal, if the glass is not scratched, it is sapphire glass.

Gently tap the surface with your fingernails, remember that it must be gentle, the fake one is likely to break, if the sound is dull, it is the surface of the sapphire crystal, if it is ordinary crystal or glass, the sound is more crisp.

On the surface, the fog disperses quickly in the sapphire crystal glass, and generally when you take your mouth away from the top of the glass, it disperses the moment you take it away, and when you look at the surface, you can no longer see the fog.

If you scratch the glass with your fingernails, if you have a feeling of blockage, it means that the material of the crystal is ordinary crystal, and if it feels smooth and resistant, it is sapphire.

From the side, the reddish is sapphire, and the blue is mineral glass.

The hardness of sapphire crystal is second only to diamond hardness of synthetic glass, which has the characteristics of good hardness, not easy to wear and scratch, and has higher wear resistance than crystal glass.

It should be noted that although this kind of watch glass can resist wear and scratch, it should not be bumped, pressed, dropped and other inappropriate operations.

You can pick a drop of water and put it on the side of the glass, if it is a sapphire glass, the water drop will flow cleanly, if it is not a sapphire glass, the water drop will be partially attached to the glass.

Again, the sapphire crystal is gently scraped with a fingernail and is smooth.

Most watches are flat mirrors, and although they are convex to the touch, some are convex lenses.

For example, the ouove I wear on my hand is convex, and the convex dial is relatively large and clear.

Generally flat mirrors, but some are convex.

It is neither a concave nor a convex lens, and the thickness is the same everywhere.

Some are flat, some are convex, and some are not concave.