GB/T 13452.2-2008 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 13452.2-2008 | English | 375 |
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Paints and varnishes -- Determination of film thickness
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| GB/T 13452.2-1992 | English | 399 |
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Paints and varnishes--Determination of film thickness
| Obsolete |
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GB/T 13452.2-2008: Paints and varnishes -- Determination of film thickness---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/GBT13452.2-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.040
G 50
GB/T 13452.2-2008 / ISO 2808.2007
Replacing GB/T 13452.2-1992
Paints and Varnishes – Determination of Film Thickness
(ISO 2808.2007, IDT)
Issued on. MAY 14, 2008
Implemented on. OCTOBER 01, 2008
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... 5
2 Normative References... 5
3 Terms and Definitions... 5
4 Determination of Wet-Film Thickness... 8
5 Determination of Dry-Film Thickness... 16
6 Determination of Thickness of Uncured Powder Layers... 37
7 Measurement of Film Thickness on Rough Surfaces... 42
8 Test Report... 43
Annex A (Informative) Overview of Methods... 45
Bibliography... 48
Foreword
GB/T 13452 Paints and Varnishes can be divided into the following parts.
--- Part 1 is GB/T 13452.1-1992 Paints and Varnishes - Determination of Total Lead - Flame
Atomic Absorption Spectrometric Method;
--- Part 2 is GB/T 13452.2-2008 Paints and Varnishes - Determination of Film Thickness;
--- Part 3 is GB/T 13452.3-1992 Paints and Varnishes - Determination of Hiding Power -
Part 1.Kubelka-Munk Method for White and Light-Colored Paints;
--- Part 4 is GB/T 13452.4-2008 Paints and Varnishes - Determination of Resistance to
Filiform Corrosion on Steel.
This Part is Part 2 of GB/T 13452.
This Part equivalently adopts the international standard ISO 2808-2007 Paints and Varnishes –
Determination of Film Thickness (English Version).
For the benefit of use, this Standard made the following editorial modifications against ISO
2808.2007.
a) Delete the Foreword and Introduction of the internal standard;
b) Change ISO 2811-1 in the Bibliography of this Part into the national standard GB/T 6750
that equivalently adopts this international standard; and Change ISO 3233 into national
standard GB/T 9272 that modifies and adopts this international standard.
This Part replaced GB/T 13452.2-1992 Paints and Varnishes - Determination of Film Thickness.
Compared with the previous edition GB/T 13452.2-1992, the major technical differences with
this Part are as follows.
--- Add Clause 3 Terms and Definitions in this Part;
--- The test of this Part is divided into four clauses based on wet-film thickness, dry-film
thickness, thickness of uncured powder layer and paint film thickness on rough surface;
while each clause is further divided into the relevant test methods. However, the previous
edition only arranges on a clue of single test method;
--- Add the test methods and categories of the wet-film thickness and dry-film thickness in
Clauses 4 and 5 of this Part;
--- Add the thickness of uncured powder layer and paint film thickness on rough surface in
Clauses 6 and 7 of this Part;
--- Add test methods using photothermal technology, radiation technology and acoustic
technology in Clauses 4 and 6 of this Part;
--- Add Annex A to summarize the relevant test methods of various paint film thicknesses in
tabular form in this Part; and specifies the applicable substrates, scope of application,
existing standards and precision data for each test method.
--- Add Bibliography of this Part.
The Annex A of this Part is informative.
This Part was proposed by China Petrol and Chemical Industry Association.
This Part shall be under the jurisdiction of National Technical Committee on Paints & Pigments
of Standardization Administration of China.
Drafting organization of this Part. CNCCC Changzhou Paint and Coatings Chemical Industry
Research Institute.
Chief drafting staffs of this Part. Peng Jufang.
This Part was first-time published in 1992; and it is the first-time revised hereby.
Paints and Varnishes – Determination of Film Thickness
1 Scope
This Standard describes a number of methods that are applicable to the measurement of the
thickness of coatings applied to a substrate. Methods for determining wet-film thickness, dry-
film thickness and the film thickness of uncured powder layers are described. Reference is made
to individual standards where these exist. Otherwise, the method is described in detail.
2 Normative References
The provisions in following documents become the provisions of this Part through reference in
this Part of GB/T 13452.For dated references, the subsequent amendments (excluding
corrigendum) 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.
ISO 463 Geometrical Product Specifications (GPS) – Dimensional Measuring Equipment
– Design and Metrological Characteristics of Mechanical Dial Gauges
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in ISO 4618.2006 and the
following apply.
Continuous layer formed from a single or multiple application of a coating material to a
substrate.
4 Determination of Wet-Film Thickness
The mechanical principle is suitable for all film-substrate combinations. The substrate has to
be flat in at least one direction in the area where the measurement is conducted. Curvature of
the surface in a single plane is permissible (e.g., internal or external surface of pipes).
Operate the apparatus and measure the film thickness in accordance with the manufacturer's
instructions.
5 Determination of Dry-Film Thickness
The mechanical principle is basically suitable for all film-substrate combinations. Where
mechanical gauging is used, the substrate and coating shall be hard enough to prevent the
reading from being falsified as a result of the measuring tip creating an indentation.
The micrometer shall be capable of measuring to the nearest 5μm. It shall be fitted with a ratchet
to limit the force exerted by the spindle on the test surface.
6 Determination of Thickness of Uncured Powder Layers
The film thickness of the uncured powder layer, tp, in micrometers is calculated from the
difference between the mass of the uncoated specimen and that of the coated specimen using
the following Formula (4).
Using the gravimetric method yields the mean value of the film thickness over the entire coated
surface area. When applying the powder, the reverse side of the specimen shall be masked to
prevent measurement errors resulting from partial coating of the reverse (overspray).
7 Measurement of Film Thickness on Rough Surfaces
It is advisable to take at least three readings evenly spread in each test area.
As a guide, it is recommended that there be two test areas every square meter for flat plates,
four every meter length for webs, two every meter length for flanges and two or more every
meter length for pipes (depending on pipe diameter).
8 Test Report
The test report shall include the following information.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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