GB/T 30789.1-2015 PDF EnglishUS$90.00 · In stock · Download in 9 seconds
GB/T 30789.1-2015: Paints and varnishes -- Evaluation of degradation of coatings -- Designation of quantity and size of defects, and of intensity of uniform changes in appearance -- Part 1: General introduction and designation system Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 30789.1-2015: Paints and varnishes -- Evaluation of degradation of coatings -- Designation of quantity and size of defects, and of intensity of uniform changes in appearance -- Part 1: General introduction and designation system---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT30789.1-2015 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 87.040 G 50 GB/T 30789.1-2015 / ISO 4628-1.2003 Paints and varnishes - Evaluation of degradation of coatings - Designation of quantity and size of defects, and of intensity of uniform changes in appearance - Part 1. General introduction and designation system (ISO 4628-1.2003, IDT) Issued on: JUNE 2, 2015 Implemented on: JANUARY 1, 2016 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration Committee. Table of ContentsForeword ... 3 1 Scope ... 5 2 General principles of the designation system ... 5 3 Assessment of defects and of intensity of changes ... 6 4 Expression of results ... 7 5 Test report ... 8ForewordGB/T 30789 Paints and varnishes - Evaluation of degradation of coatings - Designation of quantity and size of defects, and of intensity of uniform changes in appearance consists of the following parts. - Part 1. General introduction and designation system; - Part 2. Assessment of degree of blistering; - Part 3. Assessment of degree of rusting; - Part 4. Assessment of degree of cracking; - Part 5. Assessment of degree of flaking; - Part 6. Assessment of degree of chalking by tape method; - Part 7. Assessment of degree of chalking by velvet method; - Part 8. Assessment of degree of delamination and corrosion around a scribe or other artificial defects; - Part 9. Assessment of degree of filiform corrosion. This Part is the first part of GB/T 30789. This Part was drafted in accordance with the rules given in GB/T 1.1-2009. This Part uses translation method and identically adopts ISO 4628-1.2003 Paints and varnishes - Evaluation of degradation of coatings - Designation of quantity and size of defects, and of intensity of uniform changes in appearance - Part 1. General introduction and designation system. This Part was proposed by China Petroleum and Chemical Industry Federation. This Part shall be under the jurisdiction of National Technical Committee on Paints and Pigments of Standardization Administration of China (SAC/TC 5). The drafting organizations of this Part. CNOOC Changzhou Paint and Chemicals Research Institute Co., Ltd., China Zhiqi (Shenzhen) Co., Ltd., Guangzhou Synthetic Material Research Institute Co., Ltd., AVIC Bermuda New Material Technology Engineering Co., Ltd., Zhejiang Zhiqiang Paint Co., Ltd., Zhejiang Tianyu Group Paint Co., Ltd., Shanghai Jinlitai Chemical Industry Co., Ltd., Dongguan Yian Technology Co., Ltd., Shenzhen Hao Feng Technology Co., Ltd.. Paints and varnishes - Evaluation of degradation of coatings - Designation of quantity and size of defects, and of intensity of uniform changes in appearance - Part 1. General introduction and designation system1 ScopeThis Part of GB/T 30789 defines a system for designating the quantity and size of defects and the intensity of changes in appearance of coatings and outlines the general principles of the system used throughout GB/T 30789. This system is intended to be used, in particular, for defects caused by ageing and weathering, and for uniform changes such as colour changes, for example yellowing. The other parts of GB/T 30789 provide pictorial standards or other means of evaluating particular types of defect. As far as possible, already existing evaluation schemes have been used as the basis. This Part of GB/T 30789 can also be used for assessing defects not covered by the other parts of GB/T 30789.2 General principles of the designation systemA uniform convention has been adopted for designating the quantity and size of defects and the intensity of changes by means of ratings on a numerical scale ranging from 0 to 5.0 denoting no defects or changes, and 5 denoting defects or changes so severe that further discrimination is not reasonable. The other ratings, corresponding to the numbers 1, 2, 3 and 4, are so defined that they give optimum discrimination over the whole range of the scale. The use of intermediate half-steps is permissible, if specified, to give a more detailed report on the defects or changes observed. NOTE 1 The quantity of small defects scattered over the test area may be assessed by means of a grid method. Details of such a method are described in ISO 4540, Metallic coatings - Coatings cathodic to the substrate - Rating of electroplated test specimens subjected to corrosion tests. NOTE 2 The GB/T 30789 ranking may be different from the ranking schemes used in ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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