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Appraisal of the quality of rubber sealing strips for doors and windows

by:Kenna     2021-03-22
The actual key to doors and windows is sealing, and the sealing strip plays a pivotal role. The material of the sealing strips used in the market is generally modified by PVC. The key role in soft PVC is the quality of the plasticizer added to it. As the prices of various petrochemical products continue to rise, the sealing strips The prices of other rubber products are also rising. Some irresponsible manufacturers only look at short-term benefits and start unfair competition from raw materials (the so-called cut corners, shoddy goods, use waste engine oil, oil base leftover from the refinery, etc.) to replace high-quality plasticizers. Consumers have brought great hidden dangers. In the door manufacturing process, the investment in the sealing strip accounts for a small proportion, but its role cannot be ignored. The quality identification methods of the door and window sealing strips include the following: 1. There is a phenomenon of oil leakage on the surface. The waste engine oil is not compatible with PVC at all. Grease is easy to appear on the surface of the sealing strip, and yellow marks are also stained on the surface of the profile. Even if it is not environmentally friendly, there are a lot of volatile substances that pollute the air. 2. When those so-called plasticizers volatilize or ooze out, the sealing strip will lose its original softness, become very hard, and quickly age and shrink, so that a large gap appears in the airtight part of the door and window, and the airtightness changes. Very bad (water leakage, dust leakage), especially the steel lining inside the plastic steel doors and windows will quickly corrode. Many users often find that a lot of red liquid flows out from the bead parts inside the windows during the rainy season and it is dirty. Corroded early, the life of doors and windows will be greatly reduced. In the actual production process, the input of the sealing strip accounts for a small proportion, but its role cannot be ignored. So you don’t need to choose those counterfeit products in order to reduce the cost. The identification method is very simple. First, use your nose to smell whether there is a peculiar smell. Normal PVC material will have a little bit of mellow smell, which is almost very small. To. 2. Wrap the sealing strip on 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). Check whether the surface of the profile and the contact surface of the sealing strip is stained or discolored, whether the dust on the surface of the sealing strip is yellow (the oil is easy to absorb soil), and whether the hands are dirty. 3. There are a lot of fillers for some cheaper sealing strips, so the surface will not be very shiny, and those that are cheap and not shiny are not advisable. 4. Look at the specific gravity, how many meters can be produced per kilogram. Many manufacturers have made great efforts in the use of fillers. In order to pursue greater output (saving a little electricity), they use talc, heavy calcium and the like as fillers, which greatly increase the proportion of sealing strip products. (We Users generally buy by kilograms and use them by length) This invisibly increases the cost more than the loss. Add the heavy calcium sealing strip, stretch it back and forth by hand several times, a small amount of white powder will appear on the surface
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