How to choose UPVC windows accessories 
  UPVC  windows and doors are PVC hexene (UPVC) resin as the main raw material, plus a certain percentage of stabilizer, coloring agents, fillers, UV absorbers, etc., after extrusion into a profile, and then cutting, welding or screw access way to the door window frames made of fans, equipped with the sealing strip, top, hardware and so on, at the same time enhance the profile of the rigid, more than a certain length of the profiles cavity fill plus steel liner (ribs), so that portal made of windows, known as PVC doors and windows.

1. Steel thermal insulation performance of windows and doors
UPVC  windows and doors for the multi-cavity structure, with good insulation properties, the heat transfer performance is very small, only steel l/357, aluminum 1 / 250, showing that plastic door and window insulation, thermal insulation results are obvious, especially for with heating the building more suitable for a modern air-conditioning. Comparing the relevant departments to investigate, UPVC windows accessories : the use of UPVC windows of the room than the use of wood doors and windows in winter indoor temperature can be 4-5 degrees higher; the northern region the use of double-glazed better effect. It is built NARL Physics test, a single glass steel, aluminum windows of the heat transfer coefficient 64W/M2K; single glass plastic window so the heat transfer coefficient 47W/M2K; ordinary double-glazed steel, aluminum windows of the heat transfer coefficient yes 3. 7W/M2K around; while DOUBLE GLAZING plastic steel window heat transfer coefficient of about 2. 5W/M2K. Building the external doors and windows accounts for 30% of the area of retaining structure, which accounted for 49% of heat, can be seen, UPVC  windows have a good energy efficiency.

2. Physical Properties of PVC windows and doors
UPVC  windows and doors of physical properties mainly refer to: PVC UPVC windows of the air permeability (air tightness), rain water permeability (water tightness), wind resistance and thermal insulation and sound insulation properties. As the plastic window and door profile has a unique multi-chamber structure, and formed by the welding process windows and doors, PVC doors and windows installed in all the gaps are equipped with doors and windows seal strip and top, so has good physical properties.

3. UPVC  windows and doors corrosion resistance:
UPVC  windows and doors because of its unique formula which has good corrosion resistance, followed by the UPVC  windows hardware corrosion resistance depends on the use of metal parts under normal circumstances for the fabricated metal products, and corrosive environment of the industry, such as food , medicine, health, chemicals and coastal areas, wet and humid areas, use corrosion of metal parts (plastic), it is the service life is 10 times the UPVC windows.

How to identify high-quality steel doors and windows?
1. The quality of steel doors and windows profiles

Should observe the appearance of profiles, colors should be the Qing Baise, rather than the usual white people think and pay attention to the composition of doors and windows of the box and fan profiles are the same color, appearance is uniform, cavity distribution is reasonable. PVC window and door profile formula by adding calcium carbonate is usually added as a fill material, and some manufacturers to reduce costs, such as by adding excessive, then become a calcification of the type of plastic, the surface of the UPVC windows made of a lack of luster, there are slightly rough, hard and brittle, it seems like a kind of rough stones a sense, the normal steel doors and windows, the surface is usually shiny, very resilient.

2. The gap and seal doors and windows

Co-ordination among the various profiles to see whether the gap close, cut it flush with the Department, profiles overlap at the level of difference and so on. General for the steel door, given the major part of the door, the gap between fans, door panels and door package edge layering Department, blinds junction of various profiles, sealing strip, etc.; the case of assembling the door, but also consider the inter-door gap; is to swing even after the two closed doors whether in the light transmission and so on. Similarly, for the used plastic windows, in addition to assembling a variety of profiles to be considered assembly gap, the seal is uniform, firm is also very important, the interface gap should be no more than 1mm, which reflects the performance of window seal. Plastic door is usually done inside the building door, on the sealing requirements are not that high. Various gap values in both the national standard requirement, but the customer concerned, the various values of the smaller gap junction profiles meet the more closely the more sophisticated assembly process, reflecting the assembly level and the group (HotTag) install tool accuracy .

3. PVC welding doors and windows

Depends on the weld is flush, are there cracks in the corners inside and outside the seam is clean and beautiful and very clean, with box-foot UPVC  windows and doors of the diagonal measurement of the size of its diagonal size difference should be no more than 3mm, right angle The smaller line differential display technique more precise, but also conducive to install.

4. PVC door and window hardware fittings, UPVC windows accessories 

Hardware for doors and windows of good or bad the quality of life also have a certain influence, the use of the hardware looks to be looked solid, and better surface gloss, protective layer dense, there is no touch scratch phenomenon, the most important point is to open should be flexible.

5. UPVC  windows and doors to strengthen the steel

In accordance with national standard steel doors and windows have different requirements for wind pressure, UPVC  windows and doors of the box, and fan assembly of the cavity need to strengthen the steel, according to the height difference with 1.2mm, 1.5mm, 2.0mm thickness of three kinds of strengthening of steel, in order to ensure product robustness and service life. While some manufacturers to reduce costs, is not loaded, or load does not meet the requirements to strengthen steel.