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Sealing tape is an inconspicuous detail in construction of doors, windows and curtain walls, but it plays a key role in use of doors and windows. Bottom sealing tapes for doors and windows cannot seal and contaminate doors and windows. Because they are not aging resistant, use a very short service life. There are many articles on Internet about sealing tape materials written by manufacturers of door and window seals. Brother Fortress thinks that explanation is not very clear, so today I will popularize it for everyone.
Sealing tape for doors and windows
1. Material types for door and window seals
According to GB/T 24498-2009 standard for sealing strips for doors, windows and curtain walls, main materials for door and window sealing strips are as follows:
General material code for rubber band for construction sealing tape
In fact, more are used, mainly 5 basic materials, namely:
1.1, TPV material:
TPV material mainly consists of PP/EPDM. As a rule, its specific gravity is lighter than that of water. It is characterized by very high aging resistance, low odor and good high and low temperature performance. Generally, high quality door and window sealing tapes or building curtain wall sealing tapes will choose TPV materials. In South China, TPV is called high temperature material in some places.
Brother Toughness note. In past, main application market for TPV was curtain wall sealing tapes, expansion joints, etc.
1.2, TPE material:
TPE material is mainly PP/SEBS. As a rule, its specific gravity is lighter than that of water. It is characterized by relative aging resistance, low odor and good low temperature performance. Generally, middle class door and window sealing strips will choose TPE material, but it should be noted that due to relatively high price of SEBS raw material, some TPE manufacturers will replace SEBS with other SBS elastomer to make PP/SBS TPE, usually this TPE will be called TPR . In north, in some areas, TPE and TPR are called Floating.
1.3, PVC material:
PVC material is a sealing tape with a long history. It is mainly composed of PVC and plasticizer. If elasticity is better, NBR rubber and CPE elastomer are usually added. Usually, specific gravity is relatively large, hardness at high and low temperatures varies greatly, there is a certain smell, and aging resistance is medium. Generally, PVC materials are used for inexpensive door and window seals.
The above three types of materials are thermoplastic elastomers, and their advantage is that they can be recycled and reused.
1.4, silicone material:
Silicone is silicone rubber, and its specific gravity is also greater than that of water. It is characterized by excellent resilience, highest temperature resistance, bright color matching, low odor and driest hand feeling. The disadvantage is poor tear resistance. As a general rule, silicone material is chosen when a particularly good sealing effect is required.
1.5, EPDM material:
EPDM is EPDM, which is one of components of TPV materials. If all sealing tapes are made from EPDM, they cannot be recycled and reused. EPDM material usually has a specific gravity greater than 1 and is characterized by aging resistance, high strength, good high and low temperatures, and strong smell. KaTypically, EPDM materials are used in medium-sized door and window sealing tapes, as well as curtain wall sealing tapes in buildings. But be reminded that many EPDM rubber bands are made from recycled rubber, which has poor aging resistance and a particularly strong odor.
If it burns to a powder, it's usually silica gel or EPDM rubber. If it feels good to touch and looks shiny, it's silicone rubber; if it does not burn to powder, it is usually TPV, TPE, PVC and usually burns with thick smoke. The one that burns is PVC, and one that burns with a rubber smell is TPE. If smell of rubber is strong, then this may be TEP. Usually TPV has smallest burning smoke, and smell is close to smell of candles.
Second, how to distinguish quality of door and window seals
2.1, manual break:
Take sealing tape and tear it off at thinner part. The greater force, higher adhesive content, which means that comprehensive performance of this sealing tape is very good, so you might consider buying it. Typically, effectiveness of breaking hands is as follows:
2.2, pull manually:
Hold sealing tape in your hand and two people, one at each end, pull it on both ends like a rope, first to see if it can be broken and then to see if it can return to its original length. , more elastic sealing tape. Well, this means that after sealing tape is installed, sealing tape will not be deformed due to long-term closing pressure of door. Typically, stability indicators for manual tension are as follows:
The above two methods are mainly for evaluating mechanical properties of sealing tape material.
2.3. Scratch sealing tape with your nails:
Sealing tapes made of poor materials and with a low adhesive content are easy to scratch white. After this type of sealing tape is installed on door, if there is a hard object or a small scratch, it will damage sealing tape. "break" like, very ugly.
2.4. Intuitive observation of sealing tape:
It depends on joint section of sealing tape, whether brightness is close to surface color of sealing tape, if it is close, it means that material of sealing tape does not contain much filler, you can buy this.
The above two methods are mainly for assessing specific gravity of sealing tape material and whether a large amount of filler has been added.
2.5. Smell sealing tape through your nose:
If sealing tape has a specific smell or smell of plastic, then this sealing tape is not suitable for use on wooden doors.Standard sealThe thread tape should be odorless or have a slight smell of natural rubber.
2.5 This method is mainly used to evaluate odor of sealing tape material.
2.6. Contamination of sealing tape material:
Wrap sealing tape as tightly as possible on profile and place it for a while at a high temperature (on roof or in a sunny place) and observe sealing tapes are colored and discolored. The dust on surface is yellow (if there is oil on surface of sealing tape, it is easy to absorb dirt), oil seepage, dirty hands, surface of sealing tape, made of good material, smooth, dust-proof, oil-resistant, high temperature resistant, etc., and will not show under high-temperature irradiation Yellow seepage oil, dirty hands etc.
2.6 This method is mainly used to evaluate resistance of sealing tape material to high and low temperatures, whether it is easy to deposit, oil, etc.
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