Baydee will take you today to learn about the sealing materials of doors and windows and their functions. And what to pay attention to when purchasing and installing materials, and how to distinguish good from bad.

Why Sealing Materials Matter

The three kinds of sealing strips, sealing tops, and sealants are aluminum alloy doors and windows processing and installation accessories. Although they only account for a small part of the entire system of aluminum alloy doors and windows, they can greatly affect the sealing of doors and windows.

As the saying goes, details determine success or failure. This sentence is especially obvious on the products of aluminum alloy doors and windows. For example, when installing sealant on aluminum alloy doors and windows, a good sealant and an experienced installer can often form the sealant at one time, which is not only beautiful, but also hardly leaks in the future.

But what if it is paired with a bad glue? Even if you are given the best glue maker, after a long time, the sealant cracks, and rainwater will continue to come in through the gaps, disturbing your life.

Similarly, other door and window processing accessories will affect the airtightness and watertightness of the doors and windows at the borders and gaps around the doors and windows.

Starter Edition: Understanding the Role of Sealing Materials

(1) Sealing strip

Sealing strip is a material commonly used for sealing aluminum alloy casement doors and windows, also known as sealing strip. The main function is that when the doors and windows are closed, the rubber strip is deformed by extrusion to play a sealing role, and at the same time increase the airtightness and watertightness. The color of the sealing strip is generally black, and it can also be made into different colors according to requirements, so as to match the doors and windows of different colors and make them consistent.

Sealant strips are divided into two categories: vulcanized rubber and thermoplastic elastomers. Common products include:

Vulcanized rubber: EPDM rubber, silicone rubber, neoprene rubber strip Thermoplastic elastomer: thermoplastic vulcanizate, polyurethane thermoplastic elastomer, plasticized polyvinyl chloride strip

There are many shapes of sealing strips, and different strips need to be used according to different parts and functional requirements of aluminum alloy doors and windows. For example, D-shaped rubber strips are generally used for sealing between casement windows and window frames; K-shaped rubber strips are generally used for sealing between glass and door and window frames.

(2) Sealing top

The sealing top is a kind of sealing material used on sliding doors and windows. It is made of polypropylene (polypropylene) filaments to make fluff, and the fluff is planted and fused on the bottom plate of polypropylene material. The wool strips are installed on the sliding doors and windows, and the wool strips fill the gap between the door and window frame and the door and window sash to play a sealing role.

At present, the sealed tops sold on the market can be divided into two categories: siliconized tops and non-siliconized tops, and can be divided into tops with sheets and tops without sheets according to their shapes.

(3) Sealant

The sealant is mainly used between the outer frame of aluminum alloy doors and windows and the wall, between glass and aluminum alloy materials.

There are many types of sealant, but there are two main types of sealant used between the outer frame of aluminum alloy doors and windows and the wall, between glass and aluminum alloy: neutral silicone sealant and neutral silicone structural adhesive:

The function of neutral silicone sealant is to seal and block and waterproof. It is used in the seal between the window frame and the wall, the seal between the profile and the profile, and the seal between the glass and the profile. Neutral silicone structural adhesives have a stronger bond than sealants. Therefore, it is often used at the junction of hidden frame curtain wall glass, sun roof glass, and large pieces of glass.

Advanced version: choose the best sealing material possible

Sealing materials, profiles, glass, and hardware accessories are all aluminum alloy door and window materials, but they are different. When choosing aluminum alloy profiles, glass, and hardware accessories, in addition to considering the needs of their own differentiation, they must also consider the scope of economic capabilities.

Sealing materials are different, and the contrast between good materials and poor materials is obvious (it may only take one or two years to feel the difference in use experience). But the price difference between the two is indeed affordable for everyone. So, choose the best sealing material possible!

(1) Choose EPDM and silicone rubber strips for sealing strips

As mentioned above, the sealing rubber strip has an important influence on the sealing effect of aluminum alloy doors and windows. High-quality rubber strips can be used for a long time without losing elasticity, and some can be equivalent to the service life of external windows. But inferior rubber strips will harden and lose their elasticity within a few months, thus losing their sealing properties.

There are three kinds of plasticized PVC strips, EPDM strips and silicone rubber strips commonly used for aluminum alloy door and window strips. Plasticized polyvinyl chloride strips use PVC resin as the main raw material, and a certain amount of plasticizer is added, so the aging time is fast.

The EPDM rubber strip and the silicone rubber strip use EPDM rubber and silicone rubber as the main raw materials respectively. After processing, these two rubber strips have excellent aging resistance, and the service life can reach about 50 years. But because of the high price of these two kinds of rubber strips, many unscrupulous businesses do not choose to use them. For consumers, EPDM and silicone rubber strips are the most cost-effective rubber strips.

(2) The wool top must use siliconized wool top, it is best to choose siliconized wool top

Whether the top is siliconized or not refers to whether the wool used in production has been treated with organic silicon. The wool top treated with organic silicon is called siliconized wool top, which has a certain water repellency ability, so as to ensure that the outer window can still guarantee the sealing ability when it encounters water, and Longer life.

The siliconized sandwich wool top is an upgraded version of the wool top. By adding a polypropylene film to the middle of the wool top during the production process, the plastic sheet can effectively block the airflow through the vertical wool, so that the airtightness and water resistance of the wool top are doubled.

(3) The sealant cannot be replaced at will

The sealant will withstand long-term sunlight ultraviolet radiation, so the sealant should be a silicone sealant with good weather resistance and displacement capacity. A good sealant product has a delicate, uniform appearance, no bubbles, and no gel.

At the same time, there are two things to be aware of when buying and using sealants. 1: There are different types of sealants. Different sealants have different uses and cannot be replaced at will. Two: When purchasing sealant, it depends on the expiration date, and the performance of expired sealant will be much worse.

(4) Sealing materials The contrast between good materials and poor materials is obvious, and the price of good materials is affordable by everyone. So, choose the best sealing material possible!