The differences between PU foamed seals and traditional seals are as follows: 1. The combination of advanced thermoplastic rubber or NBR with chlorosulfonated polyethylene (CSPE); 2. Ozone resistance, ultraviolet rotatory resistance, good chemical solvent resistance, wide use temperature range (-60 ~135 C); 3. Extremely strong tear resistance, tear resistance, temperature range between-10 ~150 (-10 C) and millions of times. Flexibility will not break; 4. Quickly restore the original appearance after compression, even in harsh environments, it can maintain its original flexibility; 5. Environmental friendly rubber-plastic composite rubber, non-toxic, environmentally friendly, pollution-free. A kind of
Because of the use of waste materials, plasticizer substitutes and high filling capacity, the traditional sealing strip has poor elasticity, easy hardening, nasty smell, easy migration, yellowing of frame material and short service life. Traditional seals contain halogens and stabilizers contain heavy metals, which is not conducive to environmental protection. Therefore, the use of traditional seals has been eliminated or restricted in developed countries and domestic cities in Beijing and coastal areas.
First, use your nose to smell if there is any odor, normal PVC material will have a little son's mellow taste, almost no smell. Second, wrap the sealing strip around 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). See whether the contact surface between the profile surface and the sealing strip is stained and discolored, whether the dust on the surface of the sealing strip is yellowing (oil is easy to absorb soil) and oil seepage, whether hands are dirty. Third, some cheaper sealant fillers will be a lot, so the surface will not be very bright, those very cheap and bright appearance is not desirable. Fourth, depending on the specific gravity, how many meters can be produced per kilogram. There are many illegal vendors who make great efforts in using fillers. We usually use fillers with smaller specific gravity to reduce the cost (light calcium carbonate) and their rice weight will not change much. But some manufacturers use talcum powder, heavy calcium and other things as fillers in order to pursue greater output (save a little electricity), which greatly increases the proportion of sealant products (our users are general). Most of them are purchased in kilograms and used in length.) This invisibly increases the cost. Add the heavy calcium sealing strip and stretch it back and forth with your hands several times. A small amount of white powder will appear on its surface.