GB/T 20624.2-2006 PDF English
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Paints and varnishes -- Rapid-deformation (impact resistance) tests -- Part 2: Falling-weight test, small-area indenter
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GB/T 20624.2-2006: Paints and varnishes -- Rapid-deformation (impact resistance) tests -- Part 2: Falling-weight test, small-area indenter
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.040
G 51
GB/T 20624.2-2006 / ISO 6272-2:2002
Paints and Varnishes - Rapid-deformation
(Impact Resistance) Tests - Part 2: Falling-weight
Test, Small-area Indenter
(ISO 6272-2: 2002, IDT)
ISSUED ON: SEPTEMBER 1, 2006
IMPLEMENTED ON: FEBRUARY 1, 2007
Jointly Issued by: General Administration of Quality Supervision,
Inspection and Quarantine;
Standardization Administration of the People's
Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Term and Definition ... 5
4 Required Supplementary Information ... 5
5 Principle ... 5
6 Significance and Use ... 5
7 Apparatus ... 5
8 Reagents ... 6
9 Sampling ... 6
10 Test Panels ... 6
11 Conditioning ... 7
12 Procedure... 7
13 Precision ... 8
14 Test Report ... 9
Appendix A ... 10
Bibliography ... 11
Foreword
GB/T 20624 "Paints and Varnishes - Rapid-deformation (Impact Resistance) Tests -
Part 2: Falling-weight Test, Small-area Indenter" is divided into the following two parts:
— Part 1: Falling-weight Test, Large-area Indenter;
— Part 2: Falling-weight Test, Small-area Indenter.
This Part is the Part 2 of GB/T 20624.
This Part is identical to International Standard ISO 6272-2:2002 "Paints and Varnishes
- Rapid-deformation (Impact Resistance) Tests - Part 2: Falling-weight Test,
Small-area Indenter" (English edition).
Appendix A of this Part is normative.
This Part was proposed by China Petroleum and Chemical Industry Association.
This Part shall be under the jurisdiction of National Technical Committee on Coatings
and Pigments of Standardization Administration of China.
Drafting organization of this Part: Paint & Coatings Chemical Industry Research
Institute of CNCCC.
Chief drafting staff of this Part: Zhou Wenpei.
Paints and Varnishes - Rapid-deformation
(Impact Resistance) Tests - Part 2: Falling-weight
Test, Small-area Indenter
1 Scope
This Part of GB/T 20624 specifies a method for rapidly deforming, by using a
spherical indenter of diameter 12.7 mm or 15.9 mm to impact a coating film and its
substrate. And evaluate the effect of such deformation.
Note: The term “impact resistance” is included in the title and text of this Part, but one important
characteristic of the apparatus used is that it should produce rapid deformation rather than a true impact.
This test method should be restricted to testing in only one laboratory when numerical
values are used because of the poor reproducibility of the method. Interlaboratory
agreement is improved when ranking is used in place of numerical values.
2 Normative References
The following normative documents contain provisions which, through reference in
this text, constitute provisions of this Part of GB/T 20624. For dated references, the
subsequent amendments or revisions of these publications do not apply. However,
parties who enter into an agreement based on this Part are encouraged to investigate
the possibility of applying the most recent editions of the normative documents
indicated below. For undated references, the latest edition of the normative document
referred to applies.
GB/T 3186-2006 Paints Varnishes and Raw Materials for Paints and Varnishes -
Sampling (ISO 15528:2000, IDT)
GB/T 9271 Paints and Varnishes; Standard Panels for Testing (GB/T 9271-1988,
eqv ISO 1514:1984)
GB 9278 Temperatures and Humidities for Conditioning and Testing of Paint
Specimens (GB 9278-1988, eqv ISO 3270:1984 Paints and Varnishes and Their
Raw Materials - Temperatures and Humidities for Conditioning and Testing)
GB/T 13452.2 Paints and Varnishes - Determination of Film Thickness (GB/T
13452.2-1992, idt ISO 2808:1974)
ISO 1513 Paints and Varnishes - Examination and Preparation of Samples for
Testing
3 Term and Definition
For the purposes of this Part, the following term and definition apply.
3.1 Impact resistance of a coating
Number of kilogram-metres required to produce cracking in a deformed coating.
4 Required Supplementary Information
For any particular application, the test method specified in this Part needs to be
completed by supplementary information. The items of supplementary information are
given in Appendix A.
5 Principle
The coatings under test are applied to suitable thin metal panels. After the coatings
have cured, a standard weight is dropped a distance so as to strike an indenter that
deforms the coating and the substrate. The indentation can be either an intrusion or
an extrusion. By gradually increasing the distance the weight drops, the point at which
failure usually occurs can be determined. Films generally fail by cracking, which is
made more visible by the use of a magnifier, by the application of a copper sulfate
(CuSO4) solution on steel, or by the use of a pinhole detector.
6 Significance and Use
Coatings attached to substrates are subjected to damaging impacts during the
manufacture of articles and their use in service. In its use over many years, this test
method for impact resistance has been found to be useful in predicting the
performance of organic coatings for their ability to resist cracking caused by such
impacts.
7 Apparatus
7.1 Tester, consisting basically of a vertical tube to guide a cylindrical weight that is
dropped on a punch resting on the test panel, and including the components
described in 7.1.1 to 7.1.4.
7.1.1 Guide tube, 0.6 to 1.2 m long, mounted vertically in a base plate. A slot is cut
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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