GB/T 6739-2006 (GB/T 6739-2022 Newer Version) PDF English
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Paints and varnishes -- Determination of film hardness by pencil test
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| GB/T 6739-2006 | English | 85 |
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Paints and varnishes -- Determination of film hardness by pencil test
| Obsolete |
| GB/T 6739-1996 | English | 279 |
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Determination of film hardness by pencil test
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| GB 6739-1986 | English | 199 |
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Method of test for film hardness by pencil test
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GB/T 6739-2006: PDF in English (GBT 6739-2006) GB/T 6739-2006
GB
National Standard
of the People’s Republic of China
ICS 87.040
G 50
GB/T 6739-2006 / ISO 15184.1998
Replacing GB/T 6739-1996
Paints and varnishes –
Determination of film hardness by pencil test
(ISO 15184.1998, IDT)
ISSUED ON. DECEMBER 12, 2006
IMPLEMENTED ON. JUNE 1, 2007
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of People's Republic of China;
Standardization Administration of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Principle ... 6
5 Additional information required ... 6
6 Apparatus ... 7
7 Sampling ... 9
8 Test panels ... 9
9 Procedure ... 9
11 Precision ... 10
12 Test report ... 11
Annex A ... 12
Foreword
This Standard equivalently adopts the international standard ISO 15184.1998 "Paints and
varnishes - Determination of film hardness by pencil test" (English version).
For ease of use, the following editorial changes are made to ISO 15184.1998.
a) Add the content to introduce the domestic brand of pencils;
b) Add the content that the panel’s surface, after the test, may be cleaned by drawing
eraser;
c) For the determination of standard test panel and paint thickness, it cites the national
standards that equivalently adopt the corresponding international standards.
This Standard replaces GB/T 6739-1996 "Determination of film hardness by pencil test".
Compared with the previous version GB/T 6739-1996, the main technical differences of this
Standard are as follows.
- The previous version equivalently adopted JIS K 5400-90-8.4;
- Expand the applicable scope of the substrate;
- For the applied load, it is changed from (1000±50) g to (750±10) g;
- For pencil hardness, its designation is expanded from 9H ~ 6B to 9H ~ 9B;
- The exposed length of pencil lead is changed from 3 mm to 5 mm ~ 6 mm;
- Add the method to use a soft cloth or swab of cotton wool to clean the panel;
- Add the provision of observation time and the provision that can use a magnifying glass
to observe;
- Add a defect-type, namely, plastic deformation;
- Change the evaluation method of results.
Annex A of this Standard is normative.
This Standard was proposed by China Petroleum and Chemical Industry Association.
This Standard shall be under the jurisdiction of the National Paints and Pigments
Standardization Technical Committee.
Drafting organizations of this Standard. China National Chemical Construction Corporation,
Changzhou Coating Chemical Research Institute AND Shanghai Modern Environmental
Engineering Technology Co., Ltd.
The main drafter of this Standard. Zheng Guojuan.
This Standard was first issued in 1986, first revision in 1996. This is the second revision.
Paints and varnishes –
Determination of film hardness by pencil test
1 Scope
1.1 This Standard is one of series-standards of sampling and test that are related to paints,
varnishes and related products.
This Standard specifies a method for determining the film hardness by pushing pencils of
known hardness over the film.
This test can be performed on a single coating of a paint, varnish or related product, or on
the upper layer of a multi-coat system.
1.2 This rapid and economic test method is effective in comparing the pencil hardness of
different coatings.
It is more effective in providing relative ratings for a series of coated panels exhibiting
significant differences in pencil hardness.
This method is applicable only to smooth surfaces.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments (excluding
corrections) or revisions do not apply to this Standard, however, parties who reach an
agreement based on this Standard are encouraged to study if the latest versions of these
documents are applicable. For undated references, the latest edition of the referenced
document applies.
GB/T 3186 Paints, varnishes and raw materials for paints and varnishes sampling (GB/T
3186-2006, ISO 15528.2000, IDT)
GB/T 9271 Paints and varnishes - Standard panels for testing (GB/T 9271-1988, eqv, ISO
1514.1984)
GB/T 13452.2 Paints and varnishes - Determination of film thickness (GB/T 13452.2-1992,
eqv, ISO 2808.1974)
GB/T 20777 Paints and varnishes - Inspection and preparation of the sample (GB/T
20777-2006, ISO 1513.1992, IDT)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
Pencil hardness. resistance of the surface of a paint film to marking, or the formation of some
other defect, as a result of the action of a pencil, with a lead of specified dimensions, shape
and hardness, which is pushed across the surface.
Marking by pencil leads covers a range of defects in the surface of the paint film. These
defects are defined as follows.
a) Plastic deformation. a permanent indentation in the paint surface without cohesive
fracture.
b) Cohesive fracture. the presence of a visible scratch or rupture in the surface of the paint
film.
c) Combinations of the above.
These defects can occur simultaneously.
4 Principle
The products or series under test are applied, in a uniform thickness, on a panel with
consistent surface structure.
After the paint is dried / solidified, place the panel in a horizontal position; by pushing a pencil,
of which the hardness gradually increases, on the paint to determine the pencil hardness of
paint.
A pencil lead with a defined geometry is pushed over the paint surface at an angle of 45°,
exerting a force of 750g on the surface.
The hardness of the pencil lead is increased in steps until the surface of the coating is marked
by the various defects specified in Clause 3.
5 Additional information required
For any particular application, the test methods specified in this Standard need to be improved
with additional information. Content of the additional information contents is listed in Annex A.
Annex A
(informative)
Additional information required
In order to normally carry out this method, it should be appropriate to provide additional
information as listed in this Annex.
The information required is better to be agreed by the relevant parties; it may be partly or
completely taken from the international standards, national standards or other documents
that are relevant to the product under test.
a) the material and surface preparation of the substrate;
b) the method of application of the test coating to the substrate;
c) the duration and conditions of drying (or stoving) of the coating, and the conditions of
ageing, if applicable, before testing;
d) the thickness, in micrometres, of the dry coating and the method of measurement used
from GB/T 13452.2, and whether it is a single coating or a multi-coat system;
e) the temperature and relative humidity of the test, if different from those specified in 9.1.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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