GB/T 6747-2008 PDF English
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GB/T 6747: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| GB/T 6747-2008 | 125 | Add to Cart | Auto, 9 seconds. | Shop primer for ship building | Valid |
| GB/T 6747-1986 | 279 | Add to Cart | 3 days | General specification of shop primers for ship building | Obsolete |
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GB/T 6747-2008: Shop primer for ship building
---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/GBT6747-2008GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 87.040 G 51 Replacing GB/T 6747-1986 Shop primer for ship building Issued on: MAY 14, 2008 Implemented on: OCTOBER 01, 2008 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Classification... 6 4 Requirements... 6 5 Test methods... 7 6 Inspection rules... 8 7 Marks, packaging, transportation and storage... 10 Annex A (normative) Test methods for the properties of shop primer... 11 Shop primer for ship building1 Scope
This Standard specifies the classification, requirements, test methods, inspection rules, marks, packaging, transportation, and storage of shop primer for ship building. This Standard applies to shop primers applied to marine steel plates, structural steel, and formed parts after shot blasting (or sandblasting) to the required grade. This shop primer serves as a temporary rust-preventive primer to protect the steel.2 Normative references
The following documents contain the provisions which, through reference in this Standard, become the provisions of this Standard. For dated references, their subsequent amendments (excluding corrigendum) or revisions do not apply to this Standard. However, the parties who enter into agreement based on this Standard are encouraged to investigate whether the latest versions of these documents are applicable. For undated reference documents, the latest versions apply to this Standard. GB/T 190, Packing symbol of dangerous goods GB/T 191, Packaging and storage marks (GB/T 191-2008, ISO 780.1997, MOD) GB/T 1720, Method of test for adhesion of paint films GB/T 1727, General methods for preparation of coating films GB/T 1728-1979, Methods of test for drying time of coatings of paints and putties GB/T 1766-2008, Paints and varnishes -- Rating schemes of degradation of coats GB/T 3186, Paints, varnishes and raw materials for paints and varnishes -- Sampling (GB/T 3186-2006, ISO 15528.2000, IDT) GB/T 8923-1988, Rust grades and preparation grades of steel surfaces before application of paints and related products (eqv ISO 8501-1.1988) GB/T 9271, Paints and varnishes standard panels for testing (GB/T 9271-2008, ISO 1514.2004, MOD) GB/T 9276, Methods of exposure to natural weathering of coating (GB/T 9276-1996, eqv ISO 2810) GB/T 9278, Temperatures and humidity for conditioning and testing of paint specimens (GB/T 9278-2008, ISO 3270.1984, Paints and Varnishes and Their Draft Materials -- Temperatures and Humidities for Conditioning and Testing, IDT) GB/T 9750, General rules for packaging, labelling, transport and storage of coating material and pigment products GB/T 13452.2, Paints and varnishes -- Determination of film thickness (GB/T 13452.2-2008, ISO 2808.2007, IDT) GB/T 13491, General rule for packing of coatings HG/T 2458, General Rules for the Inspection, Transportation and Storage of Paint Products HG/T 3668-2000, Zinc-rich primer CB 3881, Safety Regulations for Ship Painting Operations3 Classification
3.1 Type Shop primers are available in two types. those containing zinc powder and those without. Type I. Contains zinc powder; Type II. Does not contain zinc powder. 3.2 Grade (Type I only) Grade I-12.after 12 months of exposure in a marine climate environment, rust ≤ grade 1; Grade I-6.after 6 months of exposure in a marine climate environment, rust ≤ grade 1; Grade I-3.after 3 months of exposure in a marine climate environment, rust ≤ grade 1.4 Requirements
4.1 General requirements 4.1.1 The performance of the shop primer shall meet the requirements of Table 1. 4.1.2 To meet the needs of automated production line operations, the shop primer shall be able to dry in a relatively short time. 4.1.3 The shop primer shall be widely compatible with the next coat of paint and have good recoating properties for old shop primer films that have been exposed for a long time. 4.1.4 Occupational safety during primer coating in the workshop shall comply with the relevant provisions of CB 3881. 4.1.5 The reduction in cutting speed shall not exceed 15%. 4.2 Technical requirements The product shall meet the technical specifications in Table 1.5 Test methods
5.1 Test environment Proceed in accordance with GB/T 9278. 5.2 Test plate preparation 5.2.1 Material and surface treatment of test plates Unless otherwise specified, all test plates shall be made of ordinary carbon structural steel plates as specified in GB/T 9271.The surface treatment of the test plates shall meet Grade specified in GB/T 8923-1988. 5.2.2 Preparation of test samples Unless otherwise specified, apply by brush or spray according to GB/T 1727.The dry film thickness shall meet the requirements of Table 1.Unless otherwise specified, test samples shall be placed under test environmental conditions for 7 days before testing. 5.3 Drying time The determination of surface drying time shall be carried out according to Method B of GB/T 1728-1979. 5.4 Adhesion Proceed according to GB/T 1720. 5.5 Coating thickness 5.5.1 Proceed according to GB/T 13452.2. 5.5.2 The thickness of the paint film applied to the steel plate in the production line shall be determined in accordance with A.1 in Annex A. 5.6 Zinc content in non-volatile matter Proceed according to section 5.13 of HG/T 3668-2000. 5.7 Weather resistance 5.7.1 Conduct the test according to GB/T 9276. 5.7.2 The test results shall be evaluated in accordance with 4.6 of GB/T 1766-2008. 5.8 Welding and cutting Proceed as described in A.2 of Annex A.6 Inspection rules
6.1 Inspection responsibility Unless otherwise specified in the contract or order, the manufacturer of the shop primer shall be responsible for all inspections specified in this Standard. If necessary, the ordering party has the right to inspect any item as described in this Standard. 6.2 Classification of inspections 6.2.1 The inspection of shop primer for ship building is divided into type inspection and exit-factory inspection. 6.2.2 Type inspection is periodic inspection. Exit-factory inspection is batch-by-batch inspection. 6.3 Sampling Unless otherwise specified, shop primer for ship building shall be sampled in accordance with GB/T 3186.Two samples shall be prepared. one sealed and stored for future reference, and the other used as a test sample. 6.4 Type inspection 6.4.1 Inspection conditions Type inspection of shop primers shall be conducted under any of the following circumstances. a) During normal production, a type inspection shall be conducted every four years; b) When a new product is put into production; c) When changes in materials or processes are sufficient to affect product performance; d)When production resumes after a shutdown of more than one year. 6.4.2 Inspection items The shop primer shall be type inspected according to the items specified in Table 2. 6.5 Exit-factory inspection 6.5.1 Inspection conditions Each batch of paint shall undergo exit-factory inspection before leaving the factory. 6.5.2 Batch Exit-factory inspection is conducted on a batch basis, with each paint storage tank constituting one batch. 6.5.3 Inspection items The shop primer shall be subjected to exit-factory inspection according to the items specified in Table 2. 6.6 Qualification criteria If, during the inspection of paint products, the ordering party finds that the product quality does not meet the technical requirements of this Standard, both the supplier and the buyer shall re-test with double the quantity as specified in GB/T 3186.If the product still does not meet the technical requirements of this Standard, it is considered a non- conforming product.7 Marks, packaging, transportation and storage
7.1 Marks The marks on shop primer products shall comply with the requirements of GB/T 9750. 7.2 Packaging The packaging of shop primer products shall comply with the requirements of GB 190, GB/T 191 and GB/T 13491. 7.3 Transportation Shop primer products shall meet the requirements of HG/T 2458 during transportation to prevent rain and direct sunlight exposure. 7.4 Storage Shop primer products shall meet the requirements of HG/T 2458.They shall be stored in a well-ventilated, dry warehouse, protected from direct sunlight and fire sources. Under the condition of being sealed in its original packaging, the product has a shelf life of 6 months from the date of production (or according to the product's technical requirements). Products exceeding the shelf life can be inspected according to the factory inspection items specified in this Standard; if the inspection is qualified, it can still be used. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
