GB/T 1732-2020 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 1732-2020 | English | 110 |
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Determination of impact resistance of coating films
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| GB/T 1732-1993 | English | 199 |
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Determination of impact resistance of film
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| GB/T 1732-1979 | English | RFQ |
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Determination of impact resistance of film
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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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