Inferior PVC seal and advanced silicon rubber seal identification method

One, with the smell whether there smell, the general PVC seal will be very pungent odor, normal silicone rubber sealing strip material will only have a little something alcohol taste, taste is very small, almost smell.

Second, while the PVC seal and silicone rubber seal, a period of time at a high temperature (on the roof or a sunny place), PVC sealing strip short time become very soft, grease seal surface precipitation, contamination dust, and yellow (very easy to suck the oil soil) permeability, left the dirty hands; silicone rubber seal did not change the physical properties, the family used a pressure cooker ring is silicone rubber, silicone rubber is the use of high temperatures and Non-toxic environmental performance, silicone rubber 200 ℃ working environment, no significant changes in physical properties.numbered security seals

Third, while the PVC seal and silicone rubber seal on the freezer, place a few hours, PVC sealing strip will become feel very stiff, easily broken, the physical properties of silicone rubber sealing strip unchanged. -50 ℃ silicone rubber physical properties without significant change.

Fourth, some of the cheaper prices will be a lot of filler seal, so the surface will not be very bright, dull, cut off seal off sections will be very rough, feel stiff, stretched almost inelastic, silicone rubber seal bright colors, texture soft, stretched extremely flexible sealing strip cut, broken section into a delicate sheen.

Five, watching weight, how many meters per kilogram can. PVC seal traders in the use of fillers made a great play tricks, some manufacturers for the pursuit of greater yields, (save a little electricity) using talcum powder, TSP do things like fillers, greatly increasing the proportion of seal products, (Our users generally buy mostly in kilograms, according to the length of use) so that virtually has actually increased costs severely reduced the quality Debu attempt. Add TSP PVC seal, you stretched by hand back and forth several times, the surface will be a small amount of a white powder. PVC seal the density should be 1.4-1.6. Silicone rubber seal applications nanoscale silica as a filler reinforcing effect, light texture, density, specific gravity 1.1-1.25 between, so the volume ratio than PVC sealing strip 20% more.

Six, burning, PVC sealing strip combustion blistering, shrinkage, take black acrid smoke, combustion is not sufficient, leaving hard plastic residues,

Silicone rubber seal burning almost smokeless, odorless, combustion, burning substance was a white powder.Fixed Length plastic seals