In the process of making doors and windows, the investment of the sealing strip accounts for a small proportion, but its role cannot be ignored. So I don’t think you should choose fake and fake products in order to reduce the cost. The method of identification is very simple:

First, use your nose to smell if there is any peculiar smell. Normal PVC material will have a little bit of mellow smell, which is almost insignificant.

Second, wrap the sealing strip on the profile as tightly as possible, and place it under high temperature for a period of time (on the roof or in a sunny place). Check whether the surface of the profile and the contact surface of the sealing strip is stained or discolored, whether the dust on the surface of the sealing strip is yellow (the oil is easy to absorb soil), and whether the hands are dirty.

Third, some relatively cheap sealing strips will have a lot of fillers, so the surface will not be very shiny, and those that are cheap and shiny are not advisable.

Fourth, look at the specific gravity, how many meters can be produced per kilogram. There are many unscrupulous vendors who make great efforts in the use of fillers. We generally use fillers with a relatively small specific gravity to reduce costs (light calcium carbonate). The weight of the rice will not change much, but some manufacturers are pursuing greater The output of (saving a little electricity) uses talcum powder, heavy calcium and the like as fillers, which greatly increases the specific gravity of the sealing strip products. (our users generally buy by kilograms and use them by length). On the contrary, it increases the cost without hurting the death.