[China Glass Network] The rapid development of science and technology, the rapid development of the building decoration industry, however, the selection of glass is also an important step in the decoration process, different areas need to install different types of glass, how to accurately understand the advantages and disadvantages of glass, select the right glass It becomes especially important.
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Different types of glass selection criteria <br> <br> a tempered glass selection criteria
The selection criteria for tempered glass tempered glass can be referred to the following five aspects:
1, curvature
The curvature of the flat tempered glass shall not exceed 0.5% in the bow shape and shall not exceed 0.3% in the waveform.
2, impact resistance
Six tempered glass samples were taken for testing. The number of damaged samples was not more than one, and more than or equal to three were unqualified. When the number of damage is 2, another 6 pieces are taken for testing, and all 6 pieces must not be destroyed as qualified.
3, the state of debris
Take 4 pieces of tempered glass samples for testing. The number of pieces in each 50mm × 50mm area must exceed 40, and a small number of long strips are allowed. The length is not more than 75mm, and the end is not knife-shaped. Long strips extending to the edge of the glass form an angle of no more than 45° to the edge
4, the impact performance of the bullet bag
Taking four flat tempered glass samples for testing shall comply with the provisions of any of the following (1) or (2).
(1) When the glass is broken, the sum of the masses of the larger 10 pieces of each sample shall not exceed the mass corresponding to the area of ​​65 m2 of the sample. (2) When the drop height of the shotgun bag is 1200mm, the sample is not damaged.
5, bending measurement
A flat tempered glass product is used as a sample. The sample is placed vertically, and the ruler is placed horizontally against the surface of the sample for measurement. The arc is expressed as a percentage of the ratio of the height of the arc to the length of the string. In the case of a waveform, the height from the trough to the peak is expressed as a percentage of the ratio of the peak to the peak () or the distance from the trough to the trough).
The pass rate of 4 PCT transparent glass tempering is 50mm*50mm after crushing, the number of granules is 50 granules; the pass rate of 5 PCT transparent glass tempering is 50mm*50mm, the number of granules after crushing is 120 granules; the larger flat size of glass is 2000mm*800mm after tempering It is not allowed to see ripples, pitting, and other impurities caused by processing. After the glass tempering, the original flatness should be kept smooth; the smaller size of the glass is 80mm*80mm. Under the correct operation, after tempering, it is not There may be a broken foot or a falling foot phenomenon.
Second, the selection criteria for laminated glass
Laminated glass laminated glass shall be placed at a height of 1200mm from the surface of the sample. The impact point after free fall shall be in a circle with a radius of 25mm centered on the geometric center of the sample. The state when one block or more blocks are destroyed. The first thing to look at is the manufacturer's product description, and the test results of the product. If you can further choose from thickness specifications that meet current specifications and standards, please refer to the following basic principles.
1. Under normal circumstances, the performance of thicker laminated glass will be better than thinner;
2. Two laminated glass of the same thickness, the number of layers is better than the number of layers;
3. The impact resistance of the laminated glass will increase in quantity.
4. Laminated glass made of heat-reinforced glass has better impact resistance than ordinary annealed glass and tempered glass; later considerations are the weight and area of ​​the glass sheet.
Third, the selection criteria of insulating glass
Insulating glass heat insulating glass can be introduced from five aspects: transparent glass, heat absorbing glass, heat reflecting glass, low radiant glass and insulating glass.
(1) Transparent glass Ordinary transparent glass has almost the same reflectivity for various spectra, and has fast heat and fast heat dissipation. The sunshade coefficient is extremely high, and the ability to block sunlight radiation is poor. Most of the solar radiation heat enters the room through the glass. During the summer day, the heat energy entering the room through the transparent glass is much larger than the heat energy radiated from the glass, causing the indoor temperature to rise. The thermal insulation properties of clear glass are extremely poor.
(2) Endothermic glass heat-absorbing glass By adding some metal ions or some substances to the glass, the glass has some color to enhance the absorption of light. The sunshade coefficient of the heat absorbing glass is lower than that of the transparent glass, and the shading principle is to weaken the air into the room by absorbing solar energy. The nature of this occlusion is actually the absorption of radiation, and the heat absorbed by the glass will still be transmitted indoors and outdoors, rather than blocking the heat outside. Heat-absorbing glass blocks some of the solar radiant heat in summer or winter, so it can be used in the southern part of the heat-proof area, not in the north. The endothermic glass has no selectivity to the spectrum, which reduces the transmission of sunlight and hinders the projection of visible light, which will affect the daylighting. In summer, it will be hot due to heat absorption, and its own radiation rate is high. The absorbed heat will be partially radiated into the room, which may cause people's discomfort.
(3) Heat-reflecting glass The heat-reflecting glass is coated with a metal film and some interference layers on the surface, so that the glass product can reflect more solar radiation to achieve the shading effect and has rich colors. Heat-reflecting glass has a strong reflection on visible light and long-wave radiation, and its role is to limit the penetration of solar radiation into the room. The heat-reflecting glass is almost the same as the transparent glass, so it is not suitable for indoor cold areas with large temperature difference. However, in hot areas with strong light, the heat insulation effect is very good, suitable for hot summer and warm winter areas. use. It should be noted that the reflective glass, while reflecting the solar radiant heat energy, also limits the entry of visible light, which may adversely affect indoor lighting. In addition, too high reflectivity will lead to light pollution, too low to achieve energy savings.
(4) Low-emissivity glass Low-emission glass, also called Low-E glass, is a low-emission (Low-E) coating formed on the surface of the glass by vacuum deposition. The effect of the Low-E coating is firstly to reflect far-infrared radiation, effectively reducing the heat transfer coefficient of the glass; secondly, to reflect the heat radiation in the sun, to selectively reduce the shading coefficient; at the same time, the low-emissivity glass is compared with the heat-reflecting glass. It does not limit the penetration of visible light too much. The larger feature of Low-E glass is its spectral selectivity. In the manufacturing process, the process can be adjusted to produce products with various optical properties, such as the sunshade coefficient and light transmittance that we care about. Different Low-E glass varieties should be selected in different regions or orientations to achieve better results. Suitable for use in hot areas, the shaded Low-E glass has a low shading coefficient and light transmittance. In the heating area, traditional high-permeability Low-E glass with high light transmittance and shading coefficient can be selected.
(5) Insulating glass hollow glass has higher thermal resistance, can effectively prevent heat conduction caused by temperature difference in the room, has high insulation performance, and is very suitable for use in northern regions. The dry, non-convective gas in the insulating glass interlayer blocks the heat conduction path, thereby limiting the temperature difference heat transfer of the glass and effectively reducing the heat transfer coefficient of the glass. The inside is generally filled with an inert gas to further reduce the heat transfer coefficient. The gas layer of the insulating glass does not effectively limit the transmission of solar radiation, so the contribution to the improvement of the shading coefficient is limited. The two-layer glass of insulating glass can be selected according to the needs to meet the requirements of various occasions. There are transparent hollow glass, heat absorbing hollow glass, heat reflective hollow glass, Low-E hollow glass and the like. In general, the greater improvement of insulating glass is its thermal conductivity, not its thermal insulation properties. In the summer in the south, the heat entering the room through the glass is mainly radiant heat, while the indoor and outdoor temperature difference is only a small part, especially in the summer evening, the good insulation performance of the insulating glass makes it difficult for the indoor heat to be emitted. It is not good for energy saving.
At the same time in the last century, a company, specialized in faux fur research and development, was founded on the coast of the beautiful Tai Lake --- Wuxi Shuangda Plush Co., Ltd.
Understand the advantages and disadvantages of various types of glass, choose high quality glass
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