This standard specifies the technical requirements, test methods, inspection rules and marking, packing, transportation and storage of the franklinism powder spraying coating for doors and saches of profiled aluminium alloy (hereinafter referred to as the "profile").
This standard is applicable to the coating of thermosetting powder coating used for profiles.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, all editions indicated are valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
GB 175-92 Portland Cement and Ordinary Portland Cement
GB 178-77 Standard Sand for Cement Strength Test
GB/T 1732-93 Determination of Impact Resistance of Film
GB 1740-79 Methods of Test for Resistance to Heat and Humidity of Paint Films
GB 1764-79 Methods of Test for Measurement of Dry Film Thickness of Paints
GB/T 1766-1995 Paint and Varnish-Rating Schemes of Degradation of Coats
GB/T 1771-91 Paints and Varnishes-Determination of Resistance to Neutral Salt Spray
GB/T 1865-1997 Paints and Varnishes-Artificial Weathering and Exposure to Artificial Radiation-Filtered Xenon-arc Radiation
GB/T 3199-1996 Wrought Aluminium and Aluminium Alloy Products-Packing, Marking, Transporting and Storing
GB 5237-93 Wrought Aluminium Alloy--Extruded Profile for Architecture
GB/T 6739- 1996 Film Hardness Pencil Measurement Method
GB 9286-88 Paints and Varnishes-Cross-cut Test for Films
JC/T 481-92 Slaked Lime Powder of Buildings
3 Technical Requirements
3.1 General requirements
3.1.1 Before the franklinism powder spraying, the profile shall meet the requirements specified in GB 5237-93 and other relevant technical documents.
3.1.2 Before the franklinism powder spraying, the profile shall be carried out with surface pretreatment to clear off the oil stain and other impurities on its surface.
3.1.3 The profile shall be carried out with franklinism powder spraying within 24h after the surface pretreatment.
3.1.4 The thermosetting pure polyester powder coating or acrylic powder coating having high weather resistance shall be adopted.
3.2 Coating appearance
3.2.1 The coating appearance of profile shall be flat, smooth and clean.
3.2.2 Any one of the following conditions of the coating of profile is allowable defect:
a) Slight crocodile skin;
b) Indistinct color difference.
3.2.3 Any one of the following conditions of the coating of profile is disallowable defect:
a) Severe crocodile skin;
b) Obvious pinhole or shrinkage cavity;
c) Severe color difference;
d) The surface has insufficient coverage of coating or has scratch;
e) Bubble;
f) Partial shedding.
3.3 Coating color
The color of coating shall be basically consistent with the selected sample plate or color plate.
3.4 Coating thickness
The average value of the coating thickness for the finish shall not be less than 50μm, and that at the minimum point shall not be less than 40μm.
3.5 Coating hardness
The hardness of coating shall not be less than H.
3.6 Impact resistance of coating
The impact resistance of coating shall not be less than 3.0N?m.
3.7 Cross cut test of coating
The cross cut test of coating shall reach the Grade 0 given in the inspection result rating table in GB 9286-88.
3.8 Resistance to heat and humidity of coating
The resistance to heat and humidity of coating shall be Grade 1 among the ratings stated in GB 1740-79.
3.9 Resistance to mortar of coating
The phenomenon that the coating sheds off or the coating changes due to the influence of mortar or the removal of mortar shall not happen.
JG/T 3045.1-1998 The following standards are cited：
