The sealing strip of doors and windows is one of the important factors affecting the quality of doors and windows. It needs to play an important role in waterproofing, sealing and energy saving. It has the functions of sound insulation, dustproof, antifreeze, and warmth. It also has strong tensile strength and good elasticity. , and need better temperature resistance and aging resistance. In this mixed market environment, how to identify good quality?
1. Combustion method (strips that can distinguish between thermoplastics and rubber)
A. The rubber strip will turn into ash after burning and cannot be drawn. Among them, the ash content is white, and the silicon rubber is still white after rubbing the extinguishing place on white paper; the ash content is black, and EPDM or neoprene rubber is the ash content that is black after rubbing the extinguishing place on white paper. ; The ash content is black, and the natural rubber is the sticky touch at the place where it is extinguished.
B. After the thermoplastic elastic strip is burned, it can be drawn into a filament at the extinguishing place, and EVA (ethylene-vinyl acetate copolymer) has a distinct acetic acid smell. PE (polyethylene) and PP (polypropylene) have obvious candle burning smell, sustainable burning and accompanied by low melting. PVC (polyvinyl chloride) adhesive strips have the property of being extinguished immediately after fire, and are accompanied by black smoke and pungent odor.
C.TPV thermoplastic vulcanizate: the surface is matt, there is melting and drawing phenomenon, and it floats on the water surface or suspended in water.
D.SEBS thermoplastic elastomer sealing strip: the surface is matt, there is a phenomenon of melting and drawing, and it sinks slowly in water.
2. Measuring tensile force
Relatively speaking, as a sealant material, it should have a certain tensile strength. The standard requirement is that the strength is ≥5Mpa. The higher the glue content of the same material, the better the tensile force. Generally speaking, the service life will be relatively longer, and the sealing effect will be better.
3. Smell
Use your nose to smell whether there is any peculiar smell. The normal PVC material has a little mellow smell, and you can hardly smell the peculiar smell.
4. Wrap the sealing strip on the profile as tightly as possible, and place it at a high temperature for a period of time (place on the roof or in a sunny place). Check whether the contact surface between the surface of the profile and the sealing strip is stained and discolored, whether the dust on the surface of the sealing strip is yellow (it is easy to absorb soil if there is oil), see if it is oily, and whether it is stained with dirty hands.
5. Some cheap sealing strips will have a lot of fillers, so the surface will not be very bright, those that are very cheap and not bright in appearance are not advisable.
The sealing performance of doors and windows mainly depends on the sealing strip. The performance and life of the sealing strip products mainly depend on the selection of materials. Therefore, it is recommended to buy high-quality door and window sealing strips when purchasing!