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GB/T 1732-2020 PDF English

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GB/T 1732-2020: Determination of impact resistance of coating films
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GB/T 1732: Historical versions

Standard IDUSDBUY PDFDeliveryStandard Title (Description)Status
GB/T 1732-2020110 Add to Cart Auto, 9 seconds. Determination of impact resistance of coating films Valid
GB/T 1732-1993199 Add to Cart 2 days Determination of impact resistance of film Obsolete
GB/T 1732-1979RFQ ASK 3 days Determination of impact resistance of film Obsolete

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GB/T 1732-2020: Determination of impact resistance of coating films

---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/GBT1732-2020
GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 87.040 G 50 Replacing GB/T 1732-1993 Determination of impact resistance of coating 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 Principle... 5 4 Instruments and equipment... 6 5 Sample... 7 6 Test panel... 7 7 Test procedure... 8 8 Expression of results... 8 9 Test report... 9

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 1732-1993, "Determination of impact resistance of film". Compared with GB/T 1732-1993, the main technical changes, except editorial changes, are as follows. -- Delete the normative references "GB 308", "GB 708", "GB 1727" and "GB 1764"; add the normative references "GB/T 308.1-2013", "GB/T 9278", "GB/T 13452.2", "GB/T 20777" and "GB/T 37356" (see Chapter 2; Chapter 2 of version 1993); -- Add the representation of principles and results (see Chapter 3 and Chapter 8); -- Modify the requirements for the punch and steel ball of the impact tester (see 4.1; 3.2.2 of version 1993); -- Delete the correction method of the impact tester (see 3.4 of version 1993); -- Modify the size of the substrate (see 6.1; 5.1 of version 1993); -- Modify the distance between the edge of the impact point of the test plate and the edge of the test plate, and the distance between the edges of adjacent impact points (see 7.3; 6.2 of version 1993); -- Add the requirements for the adjustment of the height of the hammer and the lighting conditions for the result observation (see 7.3); -- Modify the test report (see Chapter 9, Chapter 7 of version 1993); This Standard was proposed by China Petroleum and Chemical Industry Federation. This Standard shall be under the jurisdiction of National Technical Committee 5 on Paints & Pigments of Standardization Administration of China (SAC/TC 5). The drafting organizations of this Standard. CNOOC Changzhou Paint and Coatings Industry Research Institute Co., Ltd., Shanghai Research Institute of Paint and Coatings, Biuged Laboratory Instruments (Guangzhou) Co., Ltd., Zhejiang Mingquan Industrial Spraying Equipment Co., Ltd., Zhejiang Yu Tong New Materials Co., Ltd., Qingdao Air++ New Materials Co., Ltd., Shenzhen Grandland High-tech New Material Co., Ltd., Avic Biam New Materials Technology Engineering Co., Ltd., Xuancheng Yabang Chemical Co., Ltd., Ningbo Xin'an Dope Co., Ltd., Hebei Kingdar Coatings Co., Ltd., Qingdao Xingguo Paint Co., Ltd., Jiangnan University, Jiangsu Hongtai Polymer Material Co., Ltd., Dongguan Taiho Paint Products Co., Ltd., CRRC Changchun Railway Vehicles Co., Ltd., BEVS Industrial Co., Ltd., Fujian Wanan Industry Group Co., Ltd., Zhejiang Saifei Electric Co., Ltd., UNION (Shaoguan) Chemical Co., Ltd., China Academy of Building Research, Hebei Chenyang Industry & Trade Group CO., LTD., Pushen Testing Instruments (Shanghai) Co., Ltd., Zhejiang Feijing New Material Science & Technology CO., Ltd. The drafters of this Standard. Chen Gang, Wang Meimei, Xie Zhengkun, Yu Gaobo, Mao Li’an, Yang Yaliang, Wang Baozhu, Hu Jiru, Zhang Jian, Liu Chunhua, Hu Jinping, Zhang Ran, Liu Caixia, Liu Ren, Wu Gangqiang, Zhang Fang, Hao Bo, Zeng Yuling, Huang Wen, Kang Lunguo, Wang Liansheng, Chu Huilai, Sun Dewang, Yan Zhaoming. The previous versions of the standards which are replaced by this Standard are. -- GB 1732-1979, GB/T 1732-1993. Determination of impact resistance of coating films

1 Scope

This Standard specifies the test method of impact resistance of coating films, which is expressed by the maximum height (cm) of the heavy hammer when the punch hits the test plate without causing damage to the coating film, by using a heavy hammer of fixed mass to fall on the punch. This Standard applies to the determination of impact resistance of coating 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 308.1-2013, Rolling bearings - Balls - Part 1.Steel balls 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 humidity for conditioning and testing of paint specimens

3 Principle

Apply the test sample to a suitable metal substrate. After curing, drop a heavy hammer of a fixed mass from a certain height to impact the punch, to deform the coating film and substrate.

4 Instruments and equipment

4.1 Impact tester The maximum scale of the conduit is (50.0±0.1) cm; the graduation is 1 cm; the heavy hammer mass is (1 000±1) g; it can move freely in the conduit. The steel ball on the punch has a diameter of (8.000±0.015) mm and a hardness (HRC) of 61 ~ 66, which shall meet the requirements of GB/T 308.1-2013. 4.2 Magnifier 4x magnifier.

5 Sample

According to the provisions of GB/T 3186, take representative samples of the tested product (or each product in the multi-coating system).

6 Test panel

6.1 Substrate Unless otherwise specified, the substrate shall be tinplate or steel plate. The tinplate or steel plate shall meet the technical requirements of GB/T 9271.The dimensions of the tinplate are 120 mm × 50 mm × (0.20 mm ~ 0.30 mm); the dimensions of the steel plate are 150 mm × 70 mm × (0.45 mm ~ 0.55 mm). 6.3 Drying and conditioning Each coated test plate shall be dried (or baked) and maintained under the specified conditions for a specified time. 6.4 Coating film thickness The thickness of the coating film shall be specified or agreed. The thickness of the coating film is measured according to one of the dry coating thickness measurement methods that are specified in GB/T 13452.2, in micrometers (μm).

7 Test procedure

7.1 Test times Perform three tests at the same height position. 7.2 Test environment Unless otherwise agreed, the test shall be performed under the environment that is specified in GB/T 9278. 7.3 Test Place the impact tester (4.1) on a stable platform; the conduit shall be perpendicular to the horizontal plane. Adjust the heavy hammer of the impact tester to a certain height through the heavy hammer controller; place the test plate with the coating film facing up (positive impact) or the coating film facing down (recoil) on the base.

8 Expression of results

The results are expressed as the maximum height (cm) at which no cracks, wrinkles, and peeling are observed in the three tests.

9 Test report

The test report shall at least include the following. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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