GB/T 37362.1-2019 PDF English
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GB/T 37362.1-2019: Paints and varnishes -- Drying tests -- Part 1: Determination of through-dry state and through-dry time
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NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.040
G 50
Paints and varnishes - Drying tests - Part 1:
Determination of through-dry state
and through-dry time
(ISO 9117-1:2009, MOD)
ISSUED ON: MARCH 25, 2019
IMPLEMENTED ON: FEBRUARY 01, 2020
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 ... 6
4 Principle ... 6
5 Instruments and materials ... 6
6 Sampling ... 8
7 Test panel ... 8
8 Test steps ... 9
9 Precision ... 10
10 Test report ... 10
Annex A (informative) Technical differences and reasons between this Part and
ISO 9117-1:2009 ... 12
Bibliography ... 14
Foreword
GB/T 37362 “Paints and varnishes - Drying tests” consists of 6 parts:
- Part 1: Determination of through-dry state and through-dry time;
- Part 2: Resistance to chip test;
- Part 3: Paint surface drying test - Small glass ball method;
- Part 4: Determination method using recorder;
- Part 5: Improved Bando-Wolf test method;
- Part 6: No print test.
This Part is Part 1 of GB/T 37362.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part uses redrafting method to modify and adopt ISO 9117-1:2009 “Paints
and varnishes -- Drying tests -- Part 1: Determination of through-dry state and
through-dry time”.
Compared with ISO 9117-1:2009, there are technical differences in this Part.
The terms involved in these differences have been marked by a vertical single
line (│) at the margin of the outer margin. A list of the corresponding technical
differences and their causes is given in Annex A.
This Part made the following editorial modifications:
- added informative Annex A.
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: Jiangsu Lanling Polymer Material Co.,
Ltd., Changzhou Guanghui New Materials Research Institute Co., Ltd., Anhui
Linghu Paint Co., Ltd., CNOOC Changzhou Coating Chemical Research
Institute Co., Ltd., AVIC Baimu New Material Technology Engineering Co., Ltd.,
Dongguan Enfeng Building Materials Technology Co., Ltd., Zhongche
Tangshan Locomotive & Rolling Co., Ltd., Standard Geda Precision Instrument
(Guangzhou) Co., Ltd., Yellow River Delta Jingbo Chemical Research Institute
Co., Ltd., Shenzhen Guangtian Environmental Protection Coating Co., Ltd.,
Hebei Chenyang Industry and Trade Group Co., Ltd., Zhonghua Paint (Xinfeng)
Co., Ltd., Foshan Shunde Badfu Industrial Co., Ltd., Chongqing Three Gorges
Paints and varnishes - Drying tests - Part 1:
Determination of through-dry state
and through-dry time
1 Scope
This Part of GB/T 37362 specifies the test methods for determining whether
single coating, composite coating system of paints, varnishes or related
products reach the through-dry state and through-dry time required after the
specified drying time under standard conditions.
This Part is applicable to the determinations of through-dry state and through-
dry time required for single coating, composite coating system of paints,
varnishes or related products.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 3186, Paints varnishes and raw materials for paints and varnishes -
Sampling (GB/T 3186-2006, ISO 15528:2000, IDT)
GB/T 6031, Rubber, vulcanized or thermoplastic - Determination of hardness
(hardness between 10 IRHD and 100 IRHD) (GB/T 6031-2017, ISO 48:2010,
IDT)
GB/T 9271, Paints and varnishes standard panels for testing (GB/T 9271-
2008, ISO 1514:2004, MOD)
GB/T 9278, Temperatures and humidities for conditioning and testing of paint
specimens (GB/T 9278-2008, ISO 3270:1984, IDT)
GB/T 13452.2, Paints and varnishes - Determination of film thickness (GB/T
13452.2-2008, ISO 2808:2007, IDT)
GB/T 20777, Paints and varnishes - Examination and preparation of samples
for testing (GB/T 20777-2006, ISO 1513:1992, IDT)
1 - press column;
2 - clamp;
3 - tie rod for rotating the column head;
4 - wire mesh;
5 - double-sided tape;
6 - rubber disc.
Figure 2 -- Detailed diagram of the assembly of the column head
5.2 Rubber disc: diameter is (22 ± 1) mm, thickness is (5 ± 0.5) mm and
hardness is (50 ± 5) IRHD scale (see GB/T 6031).
NOTE: It is recommended to use the rubber disc specified in GB/T 9273.
5.3 Wire mesh: it is woven from monofilament polyamide; the smallest size is
100mm × 100mm. the diameter of the monofilament is (0.12±0.01) mm and the
pore diameter is about 0.2 mm.
5.4 Load: the total mass is (1500±10) g.
5.5 Stopwatch: the accuracy is 0.1 s.
6 Sampling
According to the provisions of GB/T 3186, take a representative sample of the
test product (or each product in a multi-coat system).
According to the provisions of GB/T 20777, check and prepare the test sample.
7 Test panel
7.1 Substrate
Select 3 test panels of the type specified in GB/T 9271 as the substrate (6
pieces are required if the through-dry state and the through-dry time are
simultaneously measured). And make sure that the selected substrate is as
consistent as possible with the actual application.
7.2 Processing and painting
Process the substrate according to the provisions of GB/T 9271. Apply the
sample or system to be tested in the prescribed manner to obtain the specified
dry film thickness.
The coating method and dry film thickness shall be specified by the product
manufacturer or agreed by the relevant parties and noted in the test report [see
Some coatings, even if they have reached a functionally acceptable dry or cured
state, are not completely unaffected by the test (e.g., the wire mesh is imprinted
on the surface of the coating). In this case, it shall take the required drying time
that the test operation does not cause the coating to be damaged so that the
coating does not perform its final functional state.
For some coatings, such as those used to protect the substrate, not for
aesthetic reasons, the impression of the surface does not cause the functional
failure of the coating. For dark coatings, the rotation of the wire mesh shall
cause the surface to be polished, leaving traces that may not compromise the
final function of the coating. In this case, all observed phenomena shall be
recorded in the test report.
Avoid confusing two forms of destruction. Cohesive failure in the coating is a
form of damage in this test. The adhesion damage between the coating and the
substrate is not the damage form of this test.
8.4 Determination of through-dry time
8.4.1 Place the test panel on the base after the specified drying time (see 8.2).
8.4.2 Test according to 8.3.2 and 8.3.3 at appropriate intervals. Check the
coating damage in the test area. Stop the test when no damage occurs (see
8.3.5).
8.4.3 Repeat 8.4.1~8.4.2 on the other 2 test panels.
8.4.4 Report the longest time it takes for the coating to reach the through-dry
state in 3 trials. The result is expressed in hours (h) or minutes (min).
8.5 Coating thickness
In the untested area of the test panel, determine the thickness of the coating in
its through-dry state, in micrometer (μm), according to the procedure specified
in GB/T 13452.2.
9 Precision
There is currently no effective precision data.
10 Test report
The test report shall at least contain the following information:
a) all the information necessary to identify the product under test;
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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