Detailed Explanation of the Properties and Materials of Plastic Gaskets for Windows and Doors in Buildings
Plastic door and window gaskets of buildings (also called insulation pads, glass pads or positioning gaskets) are an unspectacular but significant component in the door and window system. They are mainly used for fitting window glass, placed between the glass and the profiles (e.g., aluminum, PVC or wood), with the functions of supporting, positioning, buffering and sealing.
Main Features
Excellent weatherability and aging resistance: Can bear the harsh conditions such as ultraviolet radiation, high and low temperature, and rain for a long time without cracking, deforming, or losing elasticity, ensuring the long-term stability of the door and window system.
Excellent strength and rigidity: Can resist the huge weight and wind pressure of the glass, preventing the glass from sinking or moving and ensuring safety.
Extremely low thermal conductivity (excellent insulation performance):
One of its most basic properties. It effectively seals the "cold and hot bridges" between glass and metal profiles, significantly improving the doors' and windows' overall insulation performance and energy savings.
Good dimensional stability:
It possesses great precision in the production process. It will not expand or shrink after installation and can always remain in a precise position, ensuring the flatness and sealing performance of the glass installation.
Corrosion resistance:
It has excellent resistance to chemicals such as rainwater and cleaning agents and won't corrode or rust like metal gaskets, thus avoiding contamination of the glass and profiles.
Buffering and shock absorption: It has a bit of elasticity and can buffer and absorb the pressure caused by wind pressure, temperature, or slight vibrations, keeping the glass from being compressed by force and shattering.
Convenient installation:
It is usually produced in various shapes (such as L-shaped, U-shaped, sheet-shaped, etc.), so it can be installed and put in place easily and precisely.
Common Materials
The plastic gaskets for doors and windows are generally produced using high-performance engineering plastics. The usual ones are:
Modified polyamide (PA, commonly called nylon):
Properties: Excellent mechanical strength, high wear resistance, and good oil resistance. It is a material that was popular in the early years and is still being used extensively today.
General type: PA66 with glass fiber reinforcement to improve its rigidity and heat resistance.
Polyvinyl Chloride (PVC):
Features: Low in cost, corrosion-resistant, easy to process. However, its heat resistance and low-temperature impact resistance are relatively poor, and its application in high-performance doors and windows is increasingly reducing.
Polypropylene (PP):
Features: Low density, light weight, and good chemical resistance. However, its rigidity is relatively poor. It is widely used in cases where the load-bearing requirements are not high.
Engineering plastic alloys (such as ABS/PVC, etc.):
Features:
It has the advantages of a number of materials, has balanced performance, and can be adjusted according to specific needs.
