Analysis:

1, Mohs hardness

The Mohs hardness of sapphire glass is 9, while that of coated glass is only 6.5. With sandpaper with hardness close to or slightly higher, gently scrape off the surface of glass from granite surface, concrete wall surface and floor surface. Scratches indicate that the mirror is made of ordinary coated glass, while non-scratches indicate that the mirror is made of sapphire glass.

2. Different characteristics

Colorless is commonly used now. Different glasses have different densities, and various chemical elements can be added. The dispersion of sand 4 shows that the material of the mirror is ordinary coated glass. Water drops on the surface of the mirror, and the widespread dispersion of sand 4 shows that the mirror is ordinary coated glass, while the non-diffusion of water shows that the mirror is sapphire glass.

Extended data:

First of all, sapphire glass

1, Introduction:

Sapphire crystal generally refers to synthetic sapphire, which is quite different from the natural sapphire that people usually understand, and is generally used to make watches and mirrors.

2. Features:

(1) Sapphire is a kind of crystal that grows into a regular arrangement of atoms in the crystal at least in the micron range.

(2) Similar to corundum, its hardness is 9, and various colors can be generated by adding various chemical elements, but now it is usually colorless.

(3) Sapphire glass has good thermal properties, excellent electrical and dielectric properties and chemical corrosion resistance. It has high temperature resistance, good thermal conductivity, high hardness, high infrared transmittance and good chemical stability.

Step 3 use:

(1) is mainly used to make the mirror of high-end watches.

(2) It is often used to make optical elements and infrared-transmitting optical windows instead of other optical materials, and is widely used in infrared and far-infrared military equipment.

Second, coated glass.

1, Introduction:

Coated glass is also called reflective glass. Coated glass is to coat one or more layers of metal, alloy or metal compound films on the surface of glass to change the optical properties of glass and meet certain requirements.

2. Classification:

According to the different product characteristics, coated glass can be divided into the following categories: heat reflective glass, Low-E glass, conductive film glass and so on.

3. Application:

Most of them are heat reflective glass and low emissivity glass. Basically, vacuum magnetron sputtering and chemical vapor deposition are used.

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