The GB/T 5237 Wrought aluminum alloy extruded profiles for architecture consists of following six parts under the general title:
——Part 1: Mill finish profiles;
——Part 2: Anodized profiles;
——Part 3: Electrodeposition coating profiles;
——Part 4: Powder coating profiles;
——Part 5: Paint coating profiles;
——Part 6: Thermal barrier profiles.
This is the fifth part of GB/T 5237.
This part is drafted in accordance with the rules given in the GB/T 1.1-2009.
This part replaces the GB/T 5237.5-2008 Wrought aluminium alloy extruded profiles for architec¬ture - Part 5: PVDF coating profiles in whole. In addition to a number of editorial changes, the following technical deviations have been made with respect to the GB/T 5237.5-2008:
——Modified the name of standard (See the cover, the cover of 2008 edition);
——Deleted the statement in the foreword "In this part, article 4.5.3.1 and 4.5.5 are compulsory. Other contents are recommended." (See the foreword of 2008 edition);
——Deleted the statement in the foreword "This part is amended refer to AAMA 2650-2005 Voluntary Specification, Performance Requirements And Test Procedures for Superior Performing Organic Coatings On Aluminum Extrusions And Panels." (See the foreword of 2008 edition);
——Modified the scope of this part (See clause 1, clause 1 of 2008 edition);
——Modified the boot of the normative references (See clause 2, clause 2 of 2008 edition);
——Deleted the normative reference GB/T 228-2002 (See clause 2 and subclause 5.2 of 2008 edition);
——Deleted the normative reference GB/T 5237.4-2008 (See clause 2 and subclause 5.4.7 of 2008 edition);
——Deleted the normative reference GB/T 6461 (See clause 2 of 2008 edition);
——Deleted the normative reference GB/T 16585 (See clause 2 of 2008 edition);
——Deleted the normative reference GB/T 20975 (See clause 2 and subclause 5.1 of 2008 edition);
——Deleted the normative reference JC/T 480 (See clause 2 and subclause 5.4.10 of 2008 edition);
——Added the normative reference GB/T 5237.2 (See clause 2 and subclause 7.3);
——Added the normative reference GB/T 8005.3 (See clause 2 and 3);
——Added the normative reference GB/T 14684 (See clause 2 and subclause 5.4.11.1);
——Added the normative reference GB/T 17671 (See clause 2 and subclause 5.4.8);
——Added the normative reference JC/T 479 (See clause 2 and subclause 5.4.11.1);
——Modified the normative reference "GB/T 1865-1997" as "GB/T 1865-2009" (See clause 2 and subclause 5.4.16.1, clause 2 and subclause 5.4.15.1 of 2008 edition);
——Replaced the dated reference GB/T 8013.3-2007 with the undated reference GB/T 8013.3 (See clause 2 and subclause 4.6.17, 5.4.8, 5.4.17 and 6.4, clauses 2,3 and subclause 4.2, 4.5.16.1, 4.5.16.2 and 5.4.16 of 2008 edition);
——Modified the guide language of the terms and definitions (See clause 3, clause 3 of 2008 edition);
——Modified the definition of exposed surfaces (See subclause 3.1, subclause 3.2 of 2008 edition);
——Deleted the definition of "film", 'thickness of coating", "local thickness", minimum local thickness" and "average thickness" (See subclause 3.1, 3.3, 3.4, 3.5 and 3.6 of 2008 edition);
——In product classification, added the types, coating code, coating composition, the characteristics of the coating and the application environment of the corresponding profiles (See subclause 4.1.2);
——Modified "Marking and Examples" in Product Classification (See subclause 4.1.3, 4.1.2 of 2008 edition);
——Added "Quality assurance" (See subclause 4.2);
——Modified "Color and color difference" as "Color difference" (See subclause 4.6.3, 5.4.3 and clause 6, subclause 4.5.2, 5.4.2 and clause 6 of 2008 edition);
——Added the requirements and test methods of the boiling water resistance (See subclause 4.6.6 and 5.4.6);
——Modified the requirements and test methods of the solvent resistance (See subclause 4.6.12 and 5.4.12, subclause 4.5.11 and 5.4.11 of 2008 edition);
——Modified the requirements of humidity resistance as "the overall damage level of the coating surface should be grade 1"(See subclause 4.6.15, subclause 4.5.14 of 2008 edition);
——Modified the requirements and test methods of the accelerated weathering resistance (See sub-clause 4.6.16.1 and 5.4.16.1 subclause 4.5.15.1 and 5.4.15.1 of 2008 edition);
——Modified the requirements and test methods of the natural exposure resistance (See subclause 4.6.16.2 and 5.4.16.2, subclause 4.5.15.2 and 5.4.15.2 of 2008 edition);
——Modified the test methods of chemical composition and mechanical properties (See subclause 5.1 and 5.2, subclause 5.1 and 5.2 of 2008 edition);
——Modified the test methods of the coating thickness (See subclause 5.4.1 subclause 5.4.3 of 2008 edition);
——In the test method of impact resistance, modified the weight tolerance of the hammer mass (See subclause 5.4.7, subclause 5.4.6 of 2008 edition);
——Modified the test methods of the abrasion resistance (See subclause 5.4.8, subclause 5.4.7 of 2008 edition);
——In the test method of the hydrochloric acid resistance, modified "Chemical pure hydrochloric acid" as "analytically pure hydrochloric acid"(See subclause 5.4.9,subclause 5.4.8 of 2008 edition);
——In the test method of the nitric acid resistance, modified the test requirements of temperature and humidity (See subclause 5.4.10, subclause 5.4.9 of 2008 edition);
——In the test method of the mortar resistance, modified "pulverized lime" as "pulverized lime specified in JC/T 479",modified "standard sand" as "sand specified in GB/T 14684"(See subclause 5.4.11.1, subclause 5.4.10 of 2008 edition);
——In the test methods of the salt spray corrosion resistance, added "the line width is 1 mm" (See subclause 5.4.14);
——Modified the requirement of batch (See subclause 6.2, subclause 6.2 of 2008 edition);
——Added the classification of inspection (See subclause 6.3);
——Modified the regulations of inspection clauses (See subclause 6.4, subclause 6.3 of 2008 edition);
——Modified the regulations of sampling (See subclause 6.5, subclause 6.4 of 2008 edition);
——Modified the judgment for test result (See subclause 6.6, subclause 6.5 of 2008 edition);
——Modified the regulations of the Marking (See subclause 7.1.1, subclause 7.1 of 2008 edition);
——Modified the content requirements of quality certificate (See subclause 7.4, subclause 7.5 of 2008 edition);
——Modified the content requirements of order (or contract) (See clause 8, clause 8 of 2008 edition);
——Added the content requirements of quality assurance (See Annex A);
——Added bibliography ( See bibliography).
This part was proposed by China Nonferrous Metals Industry Association.
This part was prepared by SAC/TC 243 State Administration of China for Standardization of Nonferrous Metals.
The previous editions of GB/T 5237.5 are as follows:
——GB/T 5237.5-2000, GB 5237.5-2004, GB/T 5237.5-2008.
Wrought aluminium alloy extruded profiles for architecture - Part 5: Paint coating profiles
1 Scope
This part of GB/T 5237 specifies the terms, definitions, requirements, test methods, conformity with standards, packaging, marking, transporting, storing, quality certificate and contents of contract (or order) of wrought aluminum alloy extruded profiles with liquid coating1) for architecture.
This part is applicable to electrostatic spraying wrought aluminium alloy extruded profiles with organic solvent or aqueous solvent polyvinylidene fluoride (PVDF) coating (hereafter referred to as the profiles).
Wrought aluminium alloy extruded profiles with the same surface treatment and of the same use for other industries may also refer to this part.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1732 Determination of impact resistance of films
GB/T 1740 Determination of resistance to heat and humidity of paint films
GB/T 1766 Method of evaluation of degradation (both exterior and accelerated) of paint films
GB/T 1865-2009 Paints and varnishes - Artificial weathering and exposure to artificial radiation - Filtered xenon-arc radiation
GB/T 3199 Wrought aluminum and aluminum alloy products - Packing, marking, transporting and storing
GB/T 4957 Non-conductive coatings on non-magnetic metal substrates - Measurement of coating thickness-Eddy current method
GB/T 5237.1 Wrought aluminum alloy extruded profiles for architecture - Part 1: Mill finish profiles
GB/T 5237.2 Wrought aluminum alloy extruded profiles for architecture - Part 2: Anodized profiles
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 6739 Paints and varnishes-Determination of film hardness by pencil test
GB/T 8005.3 Aluminum and aluminum alloy - Terms and definitions - Part 3: Surface treatment
GB/T 8013.3 Anodic oxide coatings and organic polymer coatings on aluminum and its alloys - Part 3: Organic polymer coatings
GB/T 9276 Methods of exposure to outdoor weathering of coating
GB/T 9286 Paints and varnishes - Cross test for films
GB/T 9754 Paints and varnishes - Determination of specular gloss of non-metallic paint films at 20°, 60° and 85°
GB/T 9761 Paints and varnishes - Visual comparison of the color of paints
GB/T 10125 Corrosion tests in artificial atmospheres salt spray tests
GB/T 11186.2 Methods for measuring the color of paint films - Part 2: Color measurement
GB/T 11186.3 Methods for measuring the color of paint films - Part 3: Calculation of color difference
GB/T 14684 Sand for construction
GB/T 17671 Method of testing cements - Determination of strength
JC/T 479 Building quicklime
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 8005.3 and the following apply.
3.1
exposed surfaces
visible surfaces of profiles after they are machined,assembled and installed in the architecture ,including opened or closed status
4 Requirements
4.1 Classification
4.1.1 Alloy, temper and dimension
The alloy, temper and dimension shall be in accordance with the requirements given in GB/T 5237.1.
4.1.2 Coating type, coating code, coating composition, coating characteristics and the corresponding application environment
Coating type, coating code, coating composition, coating characteristics and the corresponding application environment are shown in Table 1.
Table 1 Coating type, coating code, coating composition, coating characteristics and corresponding applicat ion environment
coating type coating codea coating composition coating characteristics and corresponding application environment
two-layer
LF2-25
primer and
topcoat Usually two-layercoating systems are the coating with solid color or pearlescent effect by mica, which doesn't need the protection of varnish. Two-layer coating applies to the environment with strong solar radiation and atmospheric corrosion
three- layer
LF3-34
primer, topcoat and varnish Usually three-layer coating systems are the coating with matlic effect and the topcoat used milled aluminium flakes. The metallic effect is different from two-layer coating systems containing mica. Because aluminium flakes is easy to be oxided or peel off and the surface of coating needs protection of varnish to assure comprehensive performance. Metallic aluminium flakes paint is seldom used in two-layer coating system. Thee-layer applies to the environment with comparatively strong solar radiation and atmospheric corrosion
four- layer
LF4-55
primer, barrier coat, topcoat and varnish Four-layer coating systems have metallic effect with higher performance requirement. The four-layer is based on the three coating system with added the barrier coat to improve the UV resistance. Fourlayer coating applies to the environment with extremely strong solar radiation and atmospheric corrosion
Note: Table A.2 shows the characteristics of primer,barrier coat,topcoat and varnish.
a "LF " in coating code means spray coating, the first number next "LF " means coat type, the suffix behind "-" means the minimum local film thickness.
4.1.3 Marking and Example
The marking of products shall be expressed in the order of product name, the standard number of this part, alloy, temper, profile reference number and length, color (or color code), coating code. Examples of marking are listed as follows:
Example 1:
Aluminum profiles, which are made of alloy 6063, temper T5, reference No. (section code) YST10002, with specific length 4000 mm, color code 2345, four-layer PVDF coating are marked as:
Liquid coating profiles GB/T 5237.5-6063T5- YST10002 x 4000 color 2345 LF4-55
Example 2:
Aluminum profiles, which are made of alloy 6063, temper T5, reference No. (section code) YST10002, with specific length 4000 mm, red, two-layer PVDF coating are marked as:
Liquid coating profiles GB/T 5237.5-6063T5- YST10002×4000 color Red LF2-25
4.2 Quality assurance
4.2.1 Process
Process assurance see A.1.
4.2.2 Raw material
The quality requirements of mill finish profiles, and pretreatment chemical agent and polyvinylidene fluoride paint see A.2.
4.3 Chemical composition
The chemical composition shall be in accordance with the requirements given in GB/T 5237.1.
4.4 Mechanical properties
The mechanical properties shall be in accordance with the requirements specified in GB/T 5237.1.
4.5 Dimension tolerance
Dimension tolerance of profiles shall be in accordance with the requirements given in GB/T 5237.1, after removing the coating layer, the change of the dimension caused by the coating thickness shall not affect assembly and use of profiles.
Foreword I
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
5 Test methods
6 Conformity with standards
7 Marking, packaging, transporting, storing and quality certificate
8 Order (or contract) content
Annex A (informative) Quality assurance
Bibliography
