PVC sealing strip is formed by microwave vulcanization process, with smooth and beautiful surface, good elasticity and compression deformation resistance, weather aging resistance, ozone resistance, chemical resistance and wide use temperature range (-40 ℃ ~ 120 ℃), etc. Excellent performance, has been widely used in manufacturing industries such as automobile doors, windows and curtain walls.

Product specifications:For different shapes, different materials, or cold resistance, heat resistance, foaming, solid body, as well as products with special performance requirements, can meet the needs of design and use.

Product process:Considering the performance requirements of aging resistance, oil resistance, heat resistance, flame resistance, sunlight resistance, ozone resistance, acid and alkali resistance, chemical reagent resistance, flame retardant, etc., it is generally made of chloroprene rubber, ethylene propylene rubber, silicone rubber, natural-chloroprene-styrene butadiene rubber, rubber-plastic rubber and other rubber compounds with excellent aging resistance.

As the manufacturing method, an extrusion molding continuous vulcanization method, an extrusion molding vulcanization can vulcanization method or a press vulcanization method is used.

Identification method:First, with the nose to smell whether there is a smell, the general PVC sealing strip will have a very pungent smell, the normal silicone rubber sealing strip will only have a little bit of alcohol, the taste is very small, almost can not smell.

Second, at the same time, the PVC sealing strip and silicone rubber sealing strip are placed at high temperature for a period of time (on the roof or in a sunny place). The PVC sealing strip will become very soft in a short time. The grease on the surface of the sealing strip will precipitate, contaminate with dust, and become yellow (oil is easy to absorb soil). The physical properties of the silicone rubber sealing strip have not changed. The pressure cooker sealing ring used at home is made of silicone rubber, is the use of silicone rubber high temperature resistance and non-toxic environmental performance, silicone rubber at 200 ℃ working environment, the physical properties of no significant change.

Third, at the same time, the PVC sealing strip and silicone rubber sealing strip in the refrigerator freezer, placed a few hours, PVC sealing strip will become very stiff, easy to break, silicone rubber sealing strip physical properties of no change. The physical properties of silicone rubber have no obvious change at -50 ℃.

Four, some of the cheaper sealing strip filler will be a lot, so the surface will not be very bright, dark color, cut off the sealing strip section will be very rough, feel stiff, stretch almost inelastic, silicone rubber sealing strip color bright, feel soft, stretch very elastic, cut off the sealing strip, the section into a fine luster.

5. Burning, the PVC sealing strip will blister, shrink, emit black pungent smoke, burn insufficiently, and leave hard plastic residues.

Six, look at the proportion, how many meters per kilogram. PVC sealing strip vendors have done a lot of work in the use of fillers. Some of them use talcum powder, heavy calcium and the like as fillers in pursuit of greater output (saving a little electricity), which greatly increases the proportion of sealing strip products (our users usually buy by kilogram and use by length). This virtually increases the cost and seriously reduces the quality without trying. Add heavy calcium PVC sealing strip, you back and forth by hand stretch several times, the surface will appear a small amount of white powder. The density of PVC sealing strip should be 1.4-1.6,. Silicone rubber sealing strip uses nanoscale silica as filling and reinforcing effect, with light texture and density specific gravity between 1.1 and 1.25, so the material yield is 20% more than PVC sealing strip.