It’s Valentine’s day. First of all, I wish you a happy holiday. I think many couples are enjoying the sweet two person world at this time. They don’t want to be disturbed. UTENCH has always been committed to providing safe and reliable windows and doors. Let’s introduce the kind of glass that allows you to hide even if you don’t pull the curtains.

1.Coated window glass

Do you wear sunglasses just to play cool and handsome?

Obviously not, so what else does it do?

Why can’t some glass doors and windows see the inside from the outside (can be used as a mirror), but can they see the outside from the inside?

To answer these two questions, we have to start with the composition of sunlight.

The composition of sunlight is very complex. In addition to visible light (wavelength range is 380-780nm), there are invisible ultraviolet (wavelength is shorter than visible light, the shortest is 100nm), infrared (wavelength is longer than visible light, the longest is 1mm), even X-ray and radio wave. Ultraviolet is harmful to human body and biology. Infrared has a high thermal effect.

Wearing sunglasses in summer can protect your eyes from strong light and ultraviolet rays. Using the same principle, in order to create better building lighting quality and effect, people invented coated glass. One side perspective glass doors and windows are likely to be installed with this kind of glass (or special membrane materials are pasted on the double side perspective glass)

Coated glass refers to the glass coated with one or more layers of metal and its compounds or non-metallic compounds on the surface of the glass by physical or (and) chemical methods to meet the specific application requirements (such as energy saving, light control).

The chemical composition of the coating is different, and the properties of the window glass are different

Coated glass is divided into sunlight-controlled coated glass and low-emissivity coated glass according to performance. According to the production process, it is divided into offline magnetron sputtering coated glass and online chemical vapor deposition coated glass.

The “line” here refers to the (original) glass production line, the “offline coating” refers to the original glass after it comes off the production line and then is coated, and the “online coating” means that the coating is part of the assembly line.

The sunlight-control coating glass has selective reflection and absorption effect on the part of sunlight with a wavelength of 300 ~ 2500nm. Low-e coated glass (referred to as Low-E glass) has a higher reflectance for infrared rays with a wavelength of 4500 ~ 25000nm from sunlight or other heat sources.

In addition to the two main types of coated glass mentioned above, a new type of coated glass, self-cleaning coated glass, came into being. Such glass can be degraded and easily cleaned by the sunlight or ultraviolet rays.

The self-cleaning performance of this kind of glass is due to the addition of photocatalytic nano materials or hydrophobic materials to its surface coating. The application of this kind of glass is expected to solve the problem of high risk and difficulty in cleaning glass curtain wall of high-rise building to a certain extent.

The coated glass can also be divided into toughened coated glass and non toughened coated glass according to the high temperature resistance of the film.

In other words, there are two ways to obtain toughened coated glass: one is tempering toughening of toughened coated glass; the other is off-line coating of toughened glass.

2.Hollow / vacuum glass

Double-layer insulating glass and double-layer insulating glass windows are common items in our lives. They have similar structures, but they are actually for the same purpose-thermal insulation.

Hollow (vacuum) glass refers to glass products with two or more pieces of glass evenly separated by effective support and sealed around, so that dry air or inert gas (or vacuum) is filled between glass layers.

The glass for making hollow (vacuum) glass products can be toughened glass, laminated (glue) glass, coated glass or ordinary flat glass, etc.

The partition supporting strips around the glass sheets are usually made of aluminum, stainless steel and composite materials.

In order to ensure that the air in the interstratified cavity is in a dry state, desiccant (such as molecular sieve) must be loaded in advance in the partition support strip.

Desiccant, partition support strip (also called spacer strip) and sealant constitute the edge sealing system of hollow (vacuum) glass. The failure of the system means the end of the life of the insulating glass.

According to the national standard, the expected service life of insulating glass shall not be less than 15 years.

Obviously, the thermal conductivity of the gas (or vacuum) cavity is far less than that of the glass material, so this kind of glass has excellent thermal insulation performance. The reason why desiccant is loaded in the partition support strip is to strictly control the water (or water vapor) intrusion into the cavity, resulting in the increase of thermal conductivity and weakening the insulation performance.