1. Quality of the Profile for PVC Windows and Doors
The appearance of the profile should be inspected. The color should be bluish-white rather than the common white. Check if the colors of the profiles used in the frames and sashes are consistent, if the appearance is uniform, and if the cavity distribution is reasonable. In the formulation of PVC window profiles, calcium carbonate is generally added as a filler. However, some manufacturers reduce costs by adding excessive amounts, which turns the plastic into a calcified material. This kind of plastic lacks luster, appears slightly rough, hard, and brittle, giving off a coarse texture similar to stone. Regular PVC windows usually have a glossy surface with good flexibility.
2. Gaps and Sealing of Windows and Doors
Check if the gaps between different profiles are tight, if the joints are aligned, and if the height differences at the profile connections are within acceptable limits. For PVC doors, the main considerations are the gaps between the door frame and sash, the door panel pressure strips, and the edges. If it’s an assembled door, consider the gaps between the panels. For hinged doors, check if light passes through when closed.
For PVC windows, apart from the assembly gaps, the sealing strips should be even and sturdy, with joint gaps no more than 1mm, indicating good sealing performance. PVC doors are generally used as interior doors, so the sealing requirements are not as high. National standards specify gap values, but for customers, smaller gaps indicate tighter assembly and better craftsmanship, reflecting the level of assembly and tool precision.
3. Welding of PVC Windows and Doors
Inspect if the welding areas are aligned, free of cracks, and if the corner seams are clean and neat. Measure the diagonal dimensions of the PVC windows and doors using a box ruler. The difference in diagonal dimensions should not exceed 3mm. Smaller diagonal differences indicate tighter craftsmanship, which also aids installation.
4. Hardware for PVC Windows and Doors
The quality of hardware affects the lifespan of the windows and doors. The hardware should appear solid, have a good surface finish, a dense protective layer, and show no signs of scratches or damage. Most importantly, the locking mechanism should operate smoothly.
5. Reinforcing Steel in PVC Windows and Doors
According to national standards, PVC windows and doors must meet certain wind pressure resistance requirements. Reinforcing steel is installed inside the frames and sashes, available in thicknesses of 1.2mm, 1.5mm, and 2.0mm, ensuring product durability and longevity. Some manufacturers cut costs by either not installing reinforcing steel or using substandard steel. Customers should pay special attention. Common inspection methods include:
1. Estimating weight: Windows and doors with reinforcing steel will be heavier; otherwise, they will be lighter.
2. Using a magnet: Place a magnet on the frame or sash. If it sticks, there is reinforcing steel inside; otherwise, there isn’t.
3. Observing if there are screws securing the steel, which can confirm if reinforcing steel is installed.
In summary, customers should exercise caution when selecting products, opting for reputable manufacturers and conducting thorough inspections to avoid being deceived.
2. Precautions When Purchasing Plastic Windows and Doors:
Do not buy low-priced PVC windows and doors.
Pay attention to the glass and hardware. The glass should be flat without water ripples. The glass should not directly contact the plastic profile but should be sealed with a pressure strip. The hardware should be complete, positioned correctly, securely mounted, and function smoothly.
The surface of the windows and doors should be smooth and flat, with no welds or fractures. The sealing strip should be flat, without curled edges, dislodged grooves, and should have no unpleasant odor. When the windows and doors are closed, there should be no gaps between the sash and the frame.
All four sides of the windows and doors should be seamlessly connected without screw joints.
Sliding windows and doors should close and slide effortlessly, producing a soft sound without any dust falling.
Both the window and door frames and sashes should have embedded steel supports.
The glass should be flat, firmly installed, and should not directly contact the profile. Glass adhesive should not be used. If it's double-glazed, the space between the panes should be free of dust and moisture.
Switch components should close tightly and operate smoothly.
PVC windows and doors are manufactured in factory workshops using specialized equipment and should not be made on-site.
(Responsible Editor: Shenghai Windows and Doors Collection Department) [Shenghai Windows and Doors provides professional custom window and door services. Website: www.shenghaimc.com]