The sealant strip of doors and windows is one of the important factors that affect 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, dust prevention, antifreeze, warmth preservation, etc, at the same time, it also has strong tensile strength and good elasticity, and needs better thermal endurance and aging resistance. In this mixed market environment, how to identify good quality?
01. Combustion method (can distinguish hot rubber body and rubber strip)
A. Rubber rubber strips become ash after burning and cannot be brushed. Among them, the ash part is white, and the one which is still white after rubbing on white paper will be extinguished is silicone rubber; The ash part is black, and the one which is black after rubbing on white paper is extinguished is EPDM or neoprene rubber; the ash is black, and it is natural rubber if you touch it with a sticky feel when it goes out.
B. After burning, the thermoplastic elastic rubber strip can be pulled into filiform at the place where it goes out, in which EVA (ethylene-vinyl acetate copolymer) has obvious acetic acid smell. PE (polyethylene) and P (polypropylene) have obvious smell of candle burning, which can be burned continuously and accompanied by low melting. PVC (polyvinyl chloride) adhesive strip has the characteristics of extinguishing when it is off fire, and it is accompanied by black smoke and pungent odor.
C.TPV thermoplastic vulcanized rubber: The surface is Matt, there is a phenomenon of melting and drawing, floating on the water surface or suspended state in the water.
D.SEBS thermoplastic elastomer sealing strip: the surface is Matt, there is the phenomenon of melting and drawing, and it sinks slowly in the water.
portant; word-wrap: break-word! im portant;" />
portant; word-wrap: break-word! im portant;" />
02. Tensile test
relatively speaking, as a sealant strip material, it should have a certain tensile strength, and the standard requirement is that the strength is greater than or equal to 5Mpa. The higher the latex content of the same material, the better the tensile force. Generally speaking, the service life will be relatively long and the sealing effect will be better.
03. Smell
use your nose to smell whether there is peculiar smell. The normal PVC material has a little mellow smell and hardly smells bad smell.
04. High temperature detection
wrap the sealing strip around the profile as tightly as possible and place it on the roof or in a sunny place for a period of time at high temperature. Check whether the contact surface between the profile surface 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 with oil), and whether it is dirty with hands.
portant; word-wrap: break-word! im portant;" />
portant; word-wrap: break-word! im portant;" />
05. Observe the color
there will be a lot of filler for some cheaper sealing strips, so the surface will not be very bright, and those that are cheap and have no bright appearance will not be carious.
The sealing performance of doors and windows mainly depends on the sealing strip. The performance and service life of sealing strip products mainly lie in the selection of materials. Therefore, we recommend that you purchase high quality door and window sealing strip!
