I. Material Types
Aluminium Alloy Profiles
Advantages: Aluminium alloy profiles are lightweight and high – strength. Their density is about one – third of that of steel, but their strength is close to or even exceeds that of some steels. This makes aluminium alloy doors and windows easy to install and operate while ensuring they are strong and durable. For example, when aluminium alloy doors and windows are used in high – rise buildings, their lighter weight puts less burden on the building structure. Moreover, aluminium alloy profiles have good corrosion resistance because a dense oxide film naturally forms on the aluminium surface, which can effectively resist corrosive substances in the atmosphere, such as acid rain.
Applicable Scenarios: They are suitable for residential and commercial buildings in various climate conditions, especially in coastal areas or regions with heavy industrial pollution where high strength and corrosion resistance of doors and windows are required.
Plastic – Steel Profiles
Advantages: Plastic – steel profiles are mainly made of polyvinyl chloride (PVC) resin, together with a certain proportion of additives such as stabilizers and lubricants. Their heat – insulation performance is excellent because the PVC material itself is a poor conductor of heat. Compared with aluminium alloy doors and windows, plastic – steel doors and windows can effectively reduce the transfer of heat between the inside and outside of a room and help reduce the energy consumption of buildings. In addition, plastic – steel profiles also have good sound – insulation effects. Their multi – chamber structure can effectively block the entry of external noise.
Applicable Scenarios: They are suitable for places where a quiet indoor environment and high heat – insulation are required, such as bedrooms and meeting rooms. When used in cold northern regions, they can effectively improve the indoor heat – preservation effect.
Broken – Bridge Aluminium Profiles
Advantages: Broken – bridge aluminium profiles are developed on the basis of aluminium alloy profiles. Their biggest feature is the use of heat – insulation broken – bridge technology. That is, the aluminium alloy profile is cut in the middle and connected with a material with low thermal conductivity (such as nylon 66) to prevent heat conduction. This kind of profile not only retains the strength and durability of aluminium alloy but also greatly improves the heat – insulation performance of doors and windows, making the indoor temperature more stable. Moreover, broken – bridge aluminium doors and windows also perform well in sound – insulation and waterproofing and are profiles with excellent comprehensive performance.
Applicable Scenarios: They are widely used in high – end residences, office buildings and other buildings where high performance of doors and windows is required. When used in regions with cold winters and hot summers, they can effectively save energy and improve the comfort of living and working.
II. Quality Indicators of Profiles
- Wall Thickness
Importance: The wall thickness of profiles is directly related to the strength and stability of doors and windows. Generally speaking, profiles with a thicker wall can bear greater external forces and are not easy to deform. For example, the national standard stipulates that the wall thickness of the main profiles of aluminium alloy doors and windows should be no less than 1.4mm. When choosing, for doors and windows of high – rise residences or in areas with strong winds, it is recommended to choose profiles with a wall thickness of more than 1.6mm to ensure safety.
Surface Treatment
Process Types and Characteristics: Different surface treatment methods will affect the appearance and corrosion resistance of profiles. For aluminium alloy profiles, common surface treatments include anodizing, electrophoretic coating, powder spraying and fluorocarbon paint spraying. Anodizing can form a hard oxide film on the profile surface to improve wear resistance and corrosion resistance; electrophoretic coating has a uniform coating and good texture; powder spraying has a rich range of colors and can effectively cover the flaws on the profile surface; fluorocarbon paint spraying has super weather resistance and is suitable for places with harsh outdoor environments.
Geometric Accuracy of Profiles
Inspection Points: High – quality profiles undergo strict quality control during the production process and have high geometric dimension accuracy. When inspecting, you can check whether the cross – sectional shape of the profile is regular and whether the size meets the standard, such as whether the joints are tight and seamless and whether the angles are accurate. If the geometric accuracy of the profile is poor, it will affect the assembly quality of doors and windows, resulting in problems such as poor sealing and unsmooth opening and closing. Geometric accuracy is a key factor for strictly demanding products. If you want to make more accurate products for doors and windows, you need to measure them accurately.
III. Brand and Price
- Brand Reputation
Benefits of Choosing Well – known Brands: Well – known brands usually have stricter quality control systems and perfect after – sales services. They have high standards in raw material procurement, production processes, quality inspection and other links of profiles and can ensure the stable quality of products. For example, some brands will conduct multiple performance tests on profiles, including wind – pressure resistance, air – tightness and water – tightness tests to ensure that they meet or even exceed national standards. Moreover, when problems occur with the products, well – known brands can provide timely and effective solutions.
Price Factors
Consideration of Cost – performance: Price is a factor that cannot be ignored when choosing profiles, but you can’t judge the quality of profiles just by price. Generally speaking, high – quality profiles may have a relatively high price due to high – quality raw materials and complex production processes. However, there are also cases of over – priced or low – quality and low – price products in the market. Therefore, when choosing, you need to comprehensively consider the performance, quality and price of profiles and look for products with high cost – performance. For example, you can compare the prices and performance parameters of different brands and different specifications of profiles and make a choice according to your own needs and budget.