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GB/T 1731-2020 English PDF (GB/T 1731-1993, GB/T 1731-1979)

GB/T 1731-2020_English: PDF (GB/T1731-2020)
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 1731-2020English155 Add to Cart 0--9 seconds. Auto-delivery Determination of flexibility of coating and putty films Valid GB/T 1731-2020
GB/T 1731-1993English199 Add to Cart 2 days [Need to translate] Determination of flexibility of films Obsolete GB/T 1731-1993
GB/T 1731-1979EnglishRFQ ASK 3 days [Need to translate] Determination of flexibility of films Obsolete GB/T 1731-1979


BASIC DATA
Standard ID GB/T 1731-2020 (GB/T1731-2020)
Description (Translated English) Determination of flexibility of coating and putty films
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard G50
Word Count Estimation 7,769
Date of Issue 2020-11-19
Date of Implementation 2021-10-01
Older Standard (superseded by this standard) GB/T 1748-1979; GB/T 1731-1993
Regulation (derived from) National Standard Announcement No. 26 of 2020

BASIC DATA
Standard ID GB/T 1731-1993 (GB/T1731-1993)
Description (Translated English) Determination of flexibility of films
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard G50
Classification of International Standard 87-010
Word Count Estimation 4,444
Date of Issue 1993/3/20
Date of Implementation 1993/12/1
Older Standard (superseded by this standard) GB 1731-1979
Quoted Standard GB 1727; GB 1764; GB 3186
Drafting Organization Shenyang paint
Administrative Organization National Standardization Technical Committee pigment coatings
Proposing organization People Republic of China Ministry of Chemical Industry
Issuing agency(ies) State Bureau of Technical Supervision
Summary This standard specifies the use of flexible measuring method for measuring the flexibility of the film, and the film does not cause damage to the smallest diameter mandrel, said the film's flexibility.

BASIC DATA
Standard ID GB/T 1731-1979 (GB/T1731-1979)
Description (Translated English) Determination of flexibility of films
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard G50
Date of Issue 1980/1/1
Date of Implementation 1980/1/1


GB/T 1731-2020 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 87.040 G 50 Replacing GB/T 1731-1993, GB/T 1748-1979 Determination of flexibility of coating and putty films ISSUED ON: NOVEMBER 19, 2020 IMPLEMENTED ON: OCTOBER 01, 2021 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of Contents Foreword ... 3  1 Scope ... 5  2 Normative references ... 5  3 Terms and definitions ... 5  4 Determination of flexibility of coating films ... 6  5 Determination of flexibility of putty films ... 9  6 Test report ... 11  Determination of flexibility of coating and putty films 1 Scope This Standard specifies the determination of flexibility of coating and putty films by a flexibility tester. Use the smallest spindle diameter that does not cause damage to the coating and putty films to represent the flexibility of the coating and putty films. This Standard applies to the determination of flexibility of coating and putty films. 2 Normative references The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document. GB/T 3186, Paints, varnishes and raw materials for paints and varnishes - Sampling GB/T 9271, Paints and varnishes standard panels for testing GB/T 9278, Temperatures and humidities for conditioning and testing of paint specimens GB/T 13452.2, Paints and varnishes - Determination of film thickness GB/T 20777, Paints and varnishes - Examination and preparation of samples for testing GB/T 37356, Paints and varnishes - Lighting and procedure for visual assessments of coatings 3 Terms and definitions The following terms and definitions are applicable to this document. 3.1 Flexibility The ability of the coating film or putty film to deform along with its substrate without damage. According to the provisions of GB/T 20777, inspect and prepare test samples. 4.3 Test panel 4.3.1 Substrate Unless otherwise specified, the substrate shall be tinplate. The tinplate shall meet the technical requirements of GB/T 9271; the dimensions are 120 mm × 25 mm × (0.20 mm ~ 0.30 mm). 4.3.2 Substrate processing and test panel coating Unless otherwise specified, process each piece of substrate according to GB/T 9271; then, apply coating of the test product or system according to the specified method. 4.3.3 Drying and conditioning Each coated test panel shall be dried (or baked) and maintained under the specified conditions for the specified time. Test panels that are not maintained under the conditions that are specified in GB/T 9278, such as drying, shall be conditioned for at least 16 h under the conditions that are specified in GB/T 9278 before the test. 4.3.4 Thickness of coating films The thickness of the coating films shall be specified or agreed. The determination of the thickness of coating films shall be performed according to one of the methods to determine the thickness of dry films that are specified in GB/T 13452.2, in micrometers (μm) or millimeters (mm). 4.4 Test procedure 4.4.1 Number of tests Perform three tests on the same spindle. 4.4.2 Test environment Unless otherwise agreed, the test shall be performed under the environment that is specified in GB/T 9278. 4.4.3 Test Place the coating films of the test panel upwards; use both hands to press the test panel on the spindle of the specified diameter of the flexibility tester of coating films (4.1.1); use two thumbs to bend the test panel around the spindle at a steady speed within 2 s ~ 3 s. After bending the test panel, the two thumbs 3 -- Spindle 1; 4 -- Spindle 2. Figure 3 -- Schematic diagram of the flexibility tester of putty films 5.1.2 Magnifier 4x magnifier. 5.1.3 Waterproof abrasive paper Suitable waterproof abrasive paper, such as No. 120, No. 180, No. 320, No. 400, No. 500 waterproof abrasive paper. 5.2 Sample According to the provisions of GB/T 3186, take representative samples of the tested product (or each product in the multi-coating system). According to the provisions of GB/T 20777, inspect and prepare test samples. 5.3 Test panel 5.3.1 Substrate Unless otherwise specified, the substrate shall be tinplate. The tinplate shall meet the technical requirements of GB/T 9271; the dimensions are 155 mm × 70 mm × (0.20 mm ~ 0.30 mm). 5.3.2 Substrate processing and test panel coating Unless otherwise specified, process each piece of substrate according to GB/T 9271; then, apply coating of the test product or system according to the specified method. 5.3.3 Drying and conditioning Each coated test panel shall be dried (or baked) and maintained under the specified conditions for the specified time. Test panels that are not maintained under the conditions that are specified in GB/T 9278, such as drying, shall be conditioned for at least 16 h under the conditions that are specified in GB/T 9278 before the test. 5.3.4 Thickness of putty films The dry film or wet film thickness of putty films shall be specified or agreed; the determination of dry film thickness shall be performed according to one of the determination method of dry film thickness that are specified in GB/T 13452.2. ......

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