What is the identification method of PVC sealing strip

There are many identification methods for PVC sealing strip. The specific analysis is as follows:

1、 Smell whether there is peculiar smell with your nose. The general PVC sealing strip will have a very pungent smell. The normal silicone rubber sealing strip will only have a little mellow smell. The smell is very small and almost can't be heard.

Two, at the same time, put the PVC sealing strip and silicone rubber sealing strip under high temperature for a period of time (on the roof or in a place with sufficient sunlight), the PVC sealing strip will become very soft in a short period of time, the grease on the surface of the sealing strip will be separated out, stained with dust, and yellow (oil is easy to absorb soil), oil seepage and dirty hands; The physical properties of the silicone rubber sealing strip have no change. The sealing ring of the pressure cooker for family use is silicone rubber, which uses the high temperature resistance and non-toxic environmental protection performance of silicone rubber. The physical properties of silicone rubber have no obvious change under the working environment of 200 ℃.

3、 At the same time, the PVC sealing strip and silicone rubber sealing strip are placed in the refrigerator freezer. After several hours, the PVC sealing strip will become stiff and easy to break, and the physical properties of silicone rubber sealing strip will not change. There is no obvious change in physical properties of silicone rubber at - 50 ℃.

4、 Some relatively cheap sealing strip fillers will be many, so the surface will not be very bright, the color will be dim, the cut-off section of the sealing strip will be very rough, the hand feel is stiff, the stretch is almost inelastic, the silicone rubber sealing strip is bright in color, the hand feel is soft, the stretch is very elastic, the cut-off sealing strip, the section will be fine luster.

5、 Burning, PVC sealing strip will blister, shrink, emit black pungent smoke, burning is not enough, leaving hard plastic residue.

6、 Look at the specific gravity. How many meters per kilogram. PVC sealing strip vendors make great efforts in the use of fillers. Some of them use talcum powder, calcium bicarbonate and other things as fillers in order to pursue greater output, which greatly increases the proportion of sealing strip products. In this way, the cost is increased and the quality is greatly reduced. Add the PVC sealing strip of heavy calcium, you stretch it back and forth several times by hand, and a small amount of white powder will appear on its surface. The density of PVC sealing strip shall be 1.4-1.6,. Silicon rubber sealing strip uses nano silica as filling and reinforcing function, with light texture and density ratio of 1.1-1.25, so the material yield is 20% more than that of PVC sealing strip.