As various petrochemical products of prices rising, some irresponsible manufacturers began from the aspects of raw material (so-called cut corners, shoddy) of unfair competition. Now some appropriate about building doors and Windows sealed the author talk about personal point of view. 

Doors and Windows actually is the key to seal, seal is good or bad sealing strip plays an important role. Use of sealing material on the market in general is on modification of PVC, its key role in the soft PVC is the stand or fall of its adding plasticizer, there is relatively stable plasticizer p phthalate dioctyl ester, dibutyl ester. But now the market price is very high, some unscrupulous traders use some other cheap things instead of (such as waste engine oil, oil refineries remaining YouDeZi) has brought great hidden trouble for the consumers. 

Its products are symptoms: 

1. The precipitate appeared on the surface of oil leakage phenomenon, the used oil and the PVC no and dissolved, sealing strip surface is easy to appear fat, on the surface profiles are infected with yellow mark. Don't even environmental protection there are a lot of volatile matter, pollute the air. 

2. When those so-called plasticizer volatilization or leakage sealing strip will lose its original softness, become very hard, and soon aging contraction, this part of the doors and Windows closed in large aperture, got worse in sealing (water leakage, leakage of dust), in particular, the steel lining plastic door window surface will soon be corrosion, there are a lot of users are often found in the rainy season from the window inside layering parts many red liquid are dirty, the Windows and doors premature leaking steel lining corroded, doors and Windows can greatly reduce the life of a. 

In the production process, the sealing strip investment accounts for a small proportion, but its role can not be ignored. So I think you don't in order to decrease the cost of a little then choose those fake fake products, the identification method is very simple, 

A, nose to smell the smell, there will be a normal PVC material of son alcohol flavor, almost small can't smell. 

Article 2, put the seal tightly bound as far as possible on the profile, placed at high temperatures for a period of time (on a roof or sunny places). Whether material surface and the sealing contact surface stained color, whether the dust on the surface of the sealing strip of yellow (with oil) is easy to absorb soil permeability oil, whether hands dirty hands. 

Three, some price cheaper filler sealing strip will be a lot, so the surface is not very bright, the very cheap very shining appearance is not desirable. 

Four, see proportion, can how many meters per kilogram. , there are many small retailers in the use of filler has great checkers, we usually adopt the relatively small proportion of filler to reduce costs (light calcium carbonate) the m weight won't have too big change, but some manufacturers to pursue greater yields, a bit (province electricity) using talcum powder, coarse whiting do such things as filler, greatly increased the proportion of sealing products, (our users are more commonly kg is favorable, according to the length of the use of) that virtually which increases costs not regret. Join the coarse whiting sealing strip, you hand stretch back and forth several times, the surface will be a small amount of white powder.