GB/T 1725-2007 PDF English (GB/T 1725-1979: Older version)
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| GB/T 1725-2007 | English | 105 |
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Paints, varnishes and plastics -- Determination of non-volatile-matter content
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| GB/T 1725-1979 | English | RFQ |
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Methods of test for non-volatile matter of varnishes, paints and their vehicles
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GB/T 1725-2007: PDF in English (GBT 1725-2007) GB/T 1725-2007
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.040
G 50
GB/T 1725-2007 / ISO 3251:2003
Replacing GB/T 1725-1979 (1989), GB/T 6740-1986, GB/T 6751-1986
Paints, Varnishes and Plastics -
Determination of Non-Volatile-Matter Content
(ISO 3251:2003, IDT)
ISSUED ON: SEPTEMBER 11, 2007
IMPLEMENTED ON: APRIL 01, 2008
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 5
4 Apparatus ... 5
5 Sampling ... 7
6 Procedure ... 7
7 Supplementary Test Conditions ... 8
8 Expression of Results ... 9
9 Precision ... 10
10 Test Report ... 11
Foreword
This Standard equivalently adopted ISO 3251:2003 Paints, Varnishes and Plastics –
Determination of Non-Volatile-Matter Content (English Version).
This Standard replaced GB/T 1725-1979 (1989) Methods of Test for Non-Volatile
Matter of Varnishes, Paints and Their Vehicles, GB/T 6740-1986 Paint Media -
Determination of Volatile and Non-Volatile Matter, and GB/T 6751-1986 Paints and
Varnishes - Determination of Volatile and Non-Volatile Matter.
Compared with GB/T 1725-1979 (1989), GB/T 6740-1986 and GB/T 6751-1986, the
major technical differences of this Standard are as follows:
--- This Standard combines the contents of the three standards; and adds the
polymer dispersions and polycondensation resins to its scope of application.
--- This Standard specifies the test procedures for some special samples and
specifies the test parameters for various types of samples.
--- This Standard specifies the error range of the test results.
This Standard was proposed by China Petrol and Chemical Industry Association.
This Standard shall be under the jurisdiction of National Technical Committee on Paints
& Pigments of Standardization Administration of China.
Drafting organization of this Standard: CNOOC Changzhou Paint and Coatings
Industry Research Institute.
Chief drafting staffs of this Standard: Zhou Xiangling, and Huang Ning.
GB/T 1725 was first-time published in 1979, and confirmed in 1989; GB/T 6740 was
first-time published in 1986; and GB/T 6751 was first-time published in 1986. The
above three standards are first-time revised.
This Standard was entrusted to National Technical Committee on Paints & Pigments
of Standardization Administration of China for interpretation.
Paints, Varnishes and Plastics - Determination of Non-
Volatile-Matter Content
1 Scope
This Standard specifies a method for determining the non-volatile-matter content by
mass of paints, varnishes, binders for paints and varnishes, polymer dispersions and
condensation resins such as phenolic resins (resols, novolak solutions, etc.).
This Standard is also applicable to formulated dispersions containing fillers, pigments
and other auxiliaries (e.g., thickeners and film-forming agents). For the method to be
usable for unplasticized polymer dispersions and rubber latices, the non-volatile
residue (which consists essentially of the polymeric material and of small quantities of
auxiliaries such as emulsifiers, protective colloids, stabilizers, solvents added as film-
forming agents and - especially for rubber latex concentrate - preserving agents) has
to be chemically stable under the test conditions. For plasticized samples, the non-
volatile residues normally include the plasticizer.
NOTE 1: The non-volatile-matter content of a product is not an absolute quantity but depends
upon the temperature and period of heating used for the determination. Consequently, when
using this method, only relative and not true values of the non-volatile-matter content are
obtained owing to solvent retention, thermal decomposition and evaporation of low molecular-
mass constituents. The method is therefore primarily intended for testing different batches of
the same type of product.
NOTE 2: This method is suitable for synthetic rubber latices provided heating for a specific
period of time is considered appropriate (ISO 124 specifies heating until the loss in mass of a
2 g test portion following successive periods of heating is less than 0.5 mg).
NOTE 3: In-house methods for determining non-volatile matter often include drying with infrared
or microwave radiation. Standardization of such methods is not possible, since they are not
generally applicable. Some polymer compositions tend to decompose during such treatment
and therefore give incorrect results.
ISO 3233:1998, Paints and varnishes - Determination of percentage volume of non-
volatile matter by measuring the density of a dried coating, specifies a method for
determining the volume of non-volatile matter in paints, varnishes and related products.
2 Normative References
The provisions in following documents become the provisions of this Standard through
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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