1.Window plastic window profile to check whether the surface of the strip is smooth, no impurities, no bubbles, no sawtooth marks, hand touch is delicate and soft. Highly filled soft PVC or EPDM seals have poor elasticity, rough surface and large deformation.
2. The hand is stretched moderately without breaking, and can be quickly restored after the bending is released. The high-filled soft PVC sealing strip is inferior in strength, and it breaks when it is folded.
3. Use the nose to smell the smell of aromatics. Some PVC sealing strips not only use waste materials of different quality, but also excessively add fillers and low molecular weight arylene oils or complex refinery oil slag heavy oils as plasticizer substitutes in the formulation. This kind of product has a large odor when it leaves the factory. As time goes on, the component volatilizes more, the sealing strip is hard and brittle, and the strip shrinks, loosens, falls off, is easy to crack and aging, and loses the sealing effect. The migration of arylene oil or heavy oil can also cause the profile to turn yellow.
4. Practical inspection: Insert the rubber strip between the profile and the glass to check the rationality of the cross-section shape of the strip and the suitability of the size. It is not very laborious to press the rubber strip, and the greater the strength of pulling out the glass, the better. If you have the conditions, you can also find a professional third-party testing agency to conduct watertight and airtightness tests.