The appearance of oil leakage on the surface appears. Those waste engine oils are not compatible with PVC at all. The surface of the sealing strip is prone to grease, and the surface of the profile is stained with yellow marks. Not even environmentally friendly, there are many volatile substances that pollute the air.
After the so-called plasticizers volatilize or ooze out, the sealing strip will lose its original softness, become very hard, and quickly age and shrink, so that a large gap appears in the closed part of the door and window, and the sealing becomes Very poor (water leakage, dust leakage) Especially the steel linings in plastic steel doors and windows will quickly corrode. Many users often find that the red liquid flowing out of the bead parts inside the windows during the rainy season is very dirty. Early corrosion will greatly reduce the life of doors and windows.
In the actual production process, the investment in sealing strips accounts for a small proportion, but its role cannot be ignored. Therefore, it is not necessary to choose those counterfeit products in order to reduce that cost. The identification method is very simple.
Use your nose to smell if there is a strange smell. The normal PVC material will have a little smell of alcohol, which is hardly smelled.
Wrap the seal as tightly as possible on the profile and leave it for a period of time at high temperature (on the roof or in a sunny place). Check whether the contact surface of the profile surface and the sealing strip is stained or discolored, whether the dust on the surface of the sealing strip is yellow (oil is easy to absorb soil), seep oil, and whether your hands are dirty.
Some cheaper sealant fillers will be a lot, so the surface will not be very shiny, those that are cheap and not shiny are not desirable.
Fourth, depending on the specific gravity, how many meters can be produced per kilogram. There are a lot of manufacturers, who are clever in using fillers. In order to pursue greater output, (saving a bit of electricity) using talc powder, heavy calcium and the like as fillers, greatly increasing the proportion of sealing strip products, (our Users generally buy in kilograms and use them in length.) This actually increases the cost and pays off. Add the calcium seal strip and stretch it back and forth by hand several times. A small amount of white powder will appear on the surface.