GB/T 1724-2019 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 1724-2019 | English | 115 |
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Paints, varnishes and printing inks - Determination of fineness of grind
| Valid |
| GB/T 1724-1979 | English | 179 |
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Methods of test for fineness of grind of paints
| Obsolete |
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GB/T 1724-2019: Paints, varnishes and printing inks - Determination of fineness of grind---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/GBT1724-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.040
G 50
Replacing GB/T 1724-1979, GB/T 6753.1-2007
Paints, Varnishes and Printing Inks
– Determination of Fineness of Grind
(ISO 1524:2013, MOD)
ISSUED ON: MARCH 25, 2019
IMPLEMENTED ON: FEBRUARY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Method-A ... 6
5 Method-B ... 11
6 Test Report ... 13
Appendix A (Informative) Comparison of Clause No. between this Standard
and ISO 1524:2013 ... 14
Appendix B (Informative) Technical Differences and their Causes between this
Standard and ISO 1524:2013... 15
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaced GB/T 1724-1979 Methods of Test for Fineness of Grind of
Paints, and GB/T 6753.1-2007 Paints, Varnishes and Printing Inks – Determination of
Fineness of Grind. This Standard is mainly based on GB/T 1724-1979, and integrates
GB/T 6753.1-2007. Compared with GB/T 1724-1979, this Standard has the major
technical changes besides the editorial modifications as follows:
--- Add the Scope (see Clause 1 of this Edition);
--- Add Method-A (see Clause 4 of this Edition);
--- Modify the requirements for fineness plate and scraper (see 5.1 of this Edition;
Clause 1 of 1979 Edition).
This Standard uses the redrafting method to modify and adopt ISO 1524:2013 Paints,
Varnishes and Printing Inks – Determination of Fineness of Grind.
Compared with ISO 1524:2013, this Standard has the structural adjustment; the
Appendix A lists Comparison List of the Clause No. between this Standard and ISO
1524:2013.
Compared with ISO 1524:2013, this Standard has the technical differences; the
clauses involved these differences have been identified by a vertical single line (|) at
the outer margin; and a list of corresponding technical differences and their causes is
given in Appendix B.
This Standard also made the following editorial changes:
--- Delete the Foreword of the international standard;
--- Add Appendix A (Informative) Comparison of Clause No. between this Standard
and ISO 1524:2013;
--- Add Appendix B (Informative) Technical Differences and their Causes between
this Standard and ISO 1524:2013.
This Standard was proposed by China Petroleum and Chemical Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee on Paints
& Pigments of Standardization Administration of China (SAC/TC 5).
Drafting organizations of this Standard: CNOOC Changzhou Paint and Coatings
Industry Research Institute Co., Ltd.; Anhui Linghu Paint Co., Ltd.; Xuancheng Yabang
Paints, Varnishes and Printing Inks
– Determination of Fineness of Grind
1 Scope
This Standard specifies the method of using the appropriate fineness plate [scale is
(µm)] to determine the grind fineness of paints, varnishes, printing inks.
This Standard is applicable to the determination of the fineness of all types of liquid
paints and varnishes and the relevant products; while it is not applicable to the
determination of the fineness of products containing flake pigments (such as glass
flaks, micaceous iron oxide, and flaks zinc powder).
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 3186 Paints Varnishes and Raw Materials for Paints and Varnishes – Sampling
(GB/T 3186-2006, ISO 15528-2000, IDT)
GB/T 20777 Paints and Varnishes - Examination and Preparation of Samples for
Testing (GB/T 20777-2006, ISO 1513:1992, IDT)
JB/T 9385-2017 Specifications for the Scraper Fineness Gauges
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1 Fineness of grind
The readings obtained on a standard fineness gauge under the specified test
conditions. Such readings indicate the depth of the fineness gauge groove at which
the discrete solid particles in the product can be easily distinguished.
5 Method-B
5.1 Instrument
The fineness gauge and scraper shall meet the requirements of JB/T 9385-2017.
The accuracy of the fineness of grind depends on the used fineness gauge (see 5.3).
When reporting the results or specifying the requirements, the specification of the
fineness gauge shall be specified (150µm, 100µm or 50µm).
5.2 Sampling
See 4.2.
5.3 Test procedures
5.3.1 Perform the preliminary tests to determine the optimum specification of the
fineness gauge and the approximate grind fineness of the sample (see Table 2 and
Paragraph 2 of 5.3.5). Such results of approximate measurement are not included in
the test results. The sample shall be tested in parallel for three times.
Table 2 – Typical Fineness Gauge Scales and Recommended Test Range Unit: µm
5.3.2 Place the washed and dried fineness gauge (see 5.1) on a flat, horizontal, non-
sliding surface.
5.3.3 Pour a sufficient amount of the sample into the deep end of the groove and allow
the sample to overflow slightly. Be careful not to entrain the sample with air when
pouring the sample.
5.3.4 Hold the scraper with the thumbs and forefingers of both hands (see 5.1); place
the blade of the scraper on the deepest end of the groove of the fineness gauge; touch
the surface of the fineness gauge; make the long side of the scraper parallel to the
wide side of the fineness gauge; moreover, the scraper shall be pressed
perpendicularly to the surface of the fineness plate; so that the scraper and the long
side of the groove form an right angle. The scraper is scraped across the entire surface
of the fineness gauge at a uniform speed within 3s to a position where the depth of the
groove is zero. In the case of printing inks or similar viscous liquids, in order to avoid
the low results, the time required for the scraper to scrape the entire groove length
shall be no less than 5s. Apply sufficient downward pressure on the scraper to ensure
Specification of fineness gauge Scale interval Recommended test range
the groove is filled with the sample and the excessive sample shall be scrapped off.
5.3.5 After the sample is scrapped, immediately (no greater than 5s) observe the
fineness gauge from the side as soon as possible. When observing, the sight line and
the long side of the groove shall form a right angle; and the angle with the surface of
the fineness gauge shall be 15°~30°; meanwhile, observation is required to be
conducted under light that is easy to see the condition of the sample in the groove.
If the flowability of the sample causes a flat pattern can’t be obtained after scraping
and coating, a minimum amount of suitable diluent or paint base solution can be added
and manually stirred; then followed by repeated test. Any dilution shall be indicated in
the report; sometimes, the diluted sampled may occur flocculation and affect the
fineness of the grind.
5.3.6 Observe the sample position where the dense particles appear firstly; record the
readings (accurate to the minimum scale) on the groove position where the particles
appear uniformly. If there are individual particles exposes to other scale lines, then the
number of the particles in the range between readings and the adjacent scale line shall
not exceed 3 (see Figure 4).
Figure 4 – Example of Fineness with Readings of 45µm
5.3.7 Immediately use suitable solvent to clean the fineness gauge and scraper after
each reading.
5.4 Results expression
The test results take the arithmetic mean of two readings that are close to each other,
accurate to the minimum scale of the fineness gauge. The difference between two
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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