Basic Knowledge of Aluminum Profiles

Aluminum profiles can be classified according to their applications:

  1. Industrial aluminum profiles: mainly used in airplanes, trains, industrial heat sink, automobiles, electrical appliances, etc.
  2. Aluminum alloy building profiles: mainly used for building doors and windows, curtain walls, indoor and outdoor decoration and aluminum profiles for building structures.

Aluminum profiles can be divided by different surface treatments:

  1. Anodized aluminum profile: the profile surface is anodized, electrolytically colored or organically colored.
  2. Electrophoretic painted aluminumprofile: the surface of the profile is treated by anodizedtogether with electrophoretic painting.
  3. Powder coatingaluminumprofile: the surface of the profile is coated with thermosetting organic polymer powder.
  4. Fluorocarbon spraying aluminumprofile: the surface of the profile is coated with polyvinylidene fluoride paint. At present, the commonly used heat-insulating profile is an aluminum alloy profile that is threaded or poured.

Key indicators:

  1. Appearance quality: The surface of the anodized profile is not allowed to have defects such as electric burns and oxide film shedding that affect touse.The paint film after surface treatments like electrophoresis, powder coating, and fluorocarbon should be uniform, clean, smooth, and no wrinkles or cracks, bubbles, flow marks, inclusions and paint film shedding as well as other defects that affect to use, but no film locally is allowed within 80mm at the end of the profile. The appearance quality of aluminum alloy building profiles will affect the architectural decoration effect, that is the reason why we have to pack the aluminum profiles with films in order to avoid scratches, bruises, and corrosion on the surface during transportation and stacking. You might discover water ripples and moldy spots in the inner cavity in some aluminum alloy building profiles on the market, reflecting their malpractice in the production process.
  2. Wall thickness: The wall thickness of the profile is one of the main factors affecting the intensityof the workpiece.The main profile is the stressed part in the project. For example, the minimum nominal wall thickness of the main profile of the external window shall not be less than 1.4mm.
  3. Film thickness: Extruded aluminum alloy profiles have poor surface corrosion resistance, sosurface treatment is required to increase the corrosion resistance, wear resistance and appearance of the aluminum profile. The film thickness grade of anodized aluminum material is divided into AA10, AA15, AA20, AA25.And the film thickness grade of electrophoretic painted aluminum material is divided into A, B and S. The minimum local thickness of the coating on the decorative surface of the powder sprayed aluminum material is ≥ 40um. The thickness of the paint layer on the decorative surface of the aluminum material sprayed with fluorocarbon paint is different due to the type of coating, and its requirements are also different. The average film thickness of the two coating is ≥ 30um, three coating is ≥ 40um, four coatings is ≥ 65um.
  4. Chemical composition and mechanical properties: The chemical composition and technical parameters of mechanical properties of different grades of aluminum alloy profiles are different, and the customer should check them one by one against the standard (contract).
  5. Color and color difference: There are differences in color and color difference between alloys of different grades and delivery states. It is recommended to fully consider the influence of color and color difference inconsistency on the building structure when selecting alloy grades and supply status.
  6. LikeSalt spray corrosion resistance, abrasiveness, weatherability, mortar resistance, etc., these are  important technical parameters of aluminum alloy profiles, which reflect the performance of aluminum alloy profiles that affect their usage.