How to distinguish between true and false doors and windows sealed

With a variety of petrochemical products prices continue to rise, some irresponsible manufacturers began aspects of unfair competition from the raw material (the so-called shoddy, shoddy).
Actual key is sealed windows and doors, sealing quality seal plays an important role. The seal material used market generally for modifying PVC, soft PVC in a key role in its inside adding a plasticizer which is nothing more than the quality, the relatively stable plasticizers are dioctyl phthalate butter, two small fat. But now the market price is high, some unscrupulous traders are using some other cheap stuff instead of (waste oil, oil refineries remaining foundation, etc.) to consumers is a big risk.
Its products symptoms:
1 show surface permeability precipitation phenomena, those fundamental and PVC waste oil is not compatible solution, seal surface is prone to grease the surface of the profile also infected with yellow marks. Do not even have a lot of environmental volatile substances, air pollution.
(2) When the so-called volatile or plasticizer exudation after the high security bolt seals will lose its original softness, becomes hard, and soon aging of contraction, so that a part of the closed doors there was a great gap, sealed resistance becomes poor (leakage, leakage of dust) in particular, steel doors and windows will soon be inside the steel liner corrosion, there are many users often find in the rainy season from inside the window out of a lot of layering parts dirty red liquid that is leaking steel doors and windows premature corrosion lining, doors and windows of life will be greatly reduced.
In the production process, the sealing strip investment accounted for a small proportion, but its role has not be ignored. So we do a little bit in order to reduce the cost then the choice of those little fake counterfeit products, the 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.
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 metal cable ties 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.