In the actual production process, the proportion of investment in fire protection strips is small, but its role can not be ignored. Therefore, it is not necessary to use counterfeit products in order to reduce the cost. The authentication method is simple.
First, smell with the nose if there is odor, the normal PVC material will have a little son of alcohol taste, almost no smell can not smell.
Second, the seal as tightly wrapped around the profile, placed at high temperatures for a period of time (on the roof or sunny place). Look at the contact surface between the surface of the profile and the sealing strip for signs of discoloration. Whether the dust on the surface of the sealing strip is yellow (oil is easily absorbed by the soil) or if the oil is dirty, is it dirty?
Third, some of the sealant fillers that are relatively inexpensive will have a lot, so the surface will not be very bright, and those that are not cheap are not desirable.
Fourth, to see the proportion, how many meters per kilogram. There are a lot of manufacturers who use big amounts of fillers. In order to pursue greater output, (That's a little electricity) uses talcum powder, heavy calcium, and the like as fillers, which greatly increases the proportion of sealing products. Users generally buy by kilograms and use them according to their length. This would inevitably increase the cost of the product. Add a heavy calcium seal strip, hand-stretched back and forth several times, and a small amount of white powder will appear on the surface.