At present, the market can play a role in the insulation of the monolithic glass has two kinds: stained glass and coated glass.

Colored glass, as the name suggests is the color of glass, including brown, gold, green, blue, gray series. This kind of transparent glass low, according to the national standard. The visible light transmission than the minimum value allowed in 18% - 25%, so it can block the sun visible in the part of the heat energy.

Coated glass, divided into the sun control coated glass and low radiation coated glass. Due to the glass surface plating a layer of metal objects, the sun in the wavelength range of 0.35 micron ---1.8 micron light has certain control effect; that is to say, the coated glass can in this wavelength range reduce the sun light transmittance, so insulation. The low radiation coated glass has a higher reflectance than that of the far infrared.

Glass in addition and in monolithic glass as the substrate, in the glass on the surface of the construction insulation film and the insulation coating liquid. Insulation film at present many varieties, many brands, many places in automotive applications is very extensive. Since there is no national standard for heat insulation film, a variety of brands in the function of publicity has varied, various terms seems to be non, causing consumer such as falling cloud in the mist.

Actually, the thermal insulation membrane is through in polyester plastic film formed on the surface of the metal objects to reduce the sun light on the glass of the transmission and heat insulation effect.

Heat insulation coating liquid on the market rare, mostly the coating liquid from a liquid to a film on construction environment and construction methods have certain requirements, the construction is not good will have certain effect on film forming coating liquid after the appearance of, although its thermal insulation function is thus reduced. With the same heat insulation film, heat insulation coating liquid is by coating solution of metal ions reduce the sun light on glass transmission of the insulation.

In addition to the above monolithic glass can be insulated, the reasonable combination of a few pieces of glass can also be insulated, which is hollow glass. Ordinary hollow glass, the monolithic glass itself can not be insulated, but through the combination of two or three layers of a single layer, and take time out of the air, the injection of inert gas, there is a certain heat insulation effect. Hollow glass insulation mechanism is to use the time to reduce the outer layer of the outer layer of glass heat absorption to the interior of the two heat transfer, but it is more obvious role or noise.

Assessment of the insulation effect of the glass, we should first look at the physical indicators. On the market some of the popular insulation terms and interpretation, such as infrared ray insulating rate, infrared reflectance, blocking the heat rate, heat rate equal to infrared blocking rate and give people passed a seems to be non concept, heat insulation is only separated by infrared.

In fact, we have to separate the heat, the heat source is the sun radiation from the. Solar radiation with the wavelength distribution known as solar radiation spectrum and solar radiation in the wavelength range is very wide, but the energy of the most concentrated in 0.17 - 4 microns. Among them, the visible region accounted for 50% of the, infrared region accounted for 43%, UV region accounted for 7%. In the infrared region, the vast majority of the concentration is below 1.8 microns, and only 3%--5% is distributed between 4 and 1.8 microns. The observations indicate that the solar radiation spectrum is not strictly continuous spectrum, in addition to the different proportions of different band entrained energy wavelength in order from short to long entrained energy ratio are very irregular. As in the infrared region below 1.8 micron, different band specific energy vary greatly. Therefore, such as the simple calculation of the average transmittance of infrared, can not see how much of the solar heat barrier, and even the number of infrared thermal energy is not reflected. Glass can be insulated, must be able to simultaneously block visible light, infrared, the effect is obvious, after all, visible light accounted for the bulk of the solar thermal energy. Assessment of the physical indicators of thermal insulation effect, our country's indicators are shading coefficient, that is, SC. According to the requirements of the public building energy efficiency design standard, the shading coefficient of the exterior window must be between 0.6 and 0.35. The lower the shading coefficient, the better the heat insulation effect. When have the heat insulation function of the monolithic glass shading coefficient of 0.6, if the sun direct light reflectance is about 6%, glass sun light {0.35 - 1.8 m} direct transmission than about at about 40% is was calculated in the absence of the secondary heat transfer, the glass is only through about 40% of the sun's heat, blocking the approximately 60% of the sun's heat.

In addition to the shading coefficient, the visible light transmittance of the glass should be compared. Because the building energy consumption, lighting energy consumption for 20 - 30%, in consideration of the energy-saving glass insulation, even as far as possible to meet the requirements of lighting. Otherwise, visible light transmission ratio is too low will lead to lack of natural lighting, even during the day have to turn on the lights, increases the energy consumption of lighting and lighting heat caused by indoor heat, increase the cooling load of air conditioning, increases the energy consumption of air conditioning system. The ideal choice is to improve the transmittance of visible light as far as possible, and the shading coefficient is lower, and the corresponding visible light transmittance is lower than that of the visible light. When shading coefficient of monolithic glass in 0.6, visible light transmittance to 45% is pretty good; if the visible light transmission ratio can be increased to 50% - 55%, it proves that the glass heat insulation of thermal infrared blocking high proportion and most transparent to visible light, thermal insulation, light transmittance function are good. National standards set the shading coefficient, but there is no visible light transmittance, can be interpreted as a standard is given a lot of difficulty, a little bit of heat insulation and light can not take into account the taste. There lies the problem, heat energy from the sun after all in the visible light that accounted for the bulk of; but if the heat insulation effect is good, shading coefficient reached 0.35 and visible light transmittance ratio is only 15% or 10%, or even lower, than the tinted glass is low, which will likely loss of the transmission function of the glass.

So, with insulated glass. The visible light transmission ratio should be with the shading coefficient in conjunction with consideration, shading coefficient high, corresponding to visible light transmission ratio should be high; low shading coefficient, visible light transmission ratio is low; however, the minimum should be shall not be lower than the standard of colored glass 18 - 25%. Must not be high, and the visible light transmission ratio is low.

Take several varieties of heat insulation glass with these two indicators are compared, the conclusion is very easy to come out. Under the condition of the same shading coefficient, the higher the visible light transmittance ratio, the better the comprehensive function of the heat insulating glass. In the above cited heat insulation glass, on the heat insulation effect of the worst colored glass, the sun shading coefficient of monolithic glass can not reach 0.6. The rest of the coated glass, insulating film glass, liquid coating glass insulation, shading coefficient of their types and varieties can reach below 0.6, worthy of comparison.

The glass, insulating film, insulating coating can in the construction of transparent glass, also can be in the colored glass, coated glass construction, after film coating liquid.

Regardless of any form of construction combination, can reduce the shading coefficient, improve the heat insulation effect. Each of these insulating glass also has weaknesses, such as light reflection ratio is too high, easy to cause light pollution; poor wear resistance; the construction process is dependent on the large, improper construction will affect the service life and the appearance of finished products. These are dependent on the use of objects to make choices based on the use of the purpose and use of the environment.