Doors and windows sealed its identification method is very simple

One, with the smell whether there is odor, normal PVC material will be a little son alcohol taste, smell almost minimal.vehicle cargo seal

Second, try to seal tightly wrapped around the profile, and a period of time at a high temperature (on the roof or sunny places). See profile surface and seal contact surfaces if there is defaced discoloration of the surface of the dust seal is yellow (with oil is very easy to suck soil) permeability, whether left the dirty hands.

Third, some of the cheaper prices will be a lot of filler seal, so the surface will not be very bright, those very cheap look very bright undesirable.
Fourth, look at the proportion of how much energy per kilogram of rice. There are many unscrupulous traders, large areas in the use of fillers tricks, some manufacturers for the pursuit of greater yields, (save a little electricity) using talcum powder, TSP do things like fillers, greatly increasing the proportion of seal products , so that virtually but increased costs outweigh the benefits. Add TSP seal, you hand stretch the back and forth several times, the surface will be a small amount of a white powder.Indicative Seals