GB/T 462-2008 (GB/T 462-2023 Newer Version) PDF English
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Paper, board and pulps - Determination of moisture content of analytical sample
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Paper, board and pulp -- Determination of moisture content of analytical sample
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GB/T 462-2003 | English | 439 |
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GB/T 462-2008: PDF in English (GBT 462-2008) GB/T 462-2008
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 85-010
Y 30
Replacing GB/T 462-2003, GB/T 741-2003
Paper, board and pulp - Determination of moisture content
of analytical sample
(ISO 287:1985, Paper and board - Determination of moisture content - Oven-drying
method, ISO 638:1978, Pulps - Determination of dry matter content, MOD)
ISSUED ON: AUGUST 19, 2008
IMPLEMENTED ON: MAY 01, 2009
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions... 4
4 Principle ... 5
5 Instruments ... 5
6 Preparation of the container ... 5
7 Sampling ... 5
8 Test steps ... 6
9 Presentation of results ... 6
10 Test report ... 7
Appendix A (Informative) The comparison table of the number of this standard chapter
and article number and the international standard chapter number ... 8
Appendix B (Informative) Technical differences between this standard and international
standard as well as their reasons ... 9
Paper, board and pulp - Determination of moisture content
of analytical sample
1 Scope
This standard specifies a method for determining the moisture content of paper, board,
pulp after sampling.
This standard applies to all kinds of paper, board, pulp; however, these paper, board,
pulp shall not contain any substances other than moisture, which can volatilize at the
specified test temperature.
This method is not applicable to the determination of the moisture content of liquid
pulp, OR the determination of the sales quality of batches of pulp bales.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For the 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 450 Paper and board - Sampling for testing and identification of machine and
cross direction wire side and felt side (GB/T 450-2008, ISO 186:2002, MOD)
GB/T 740 Pulps - Sampling for testing (GB/T 740-2003, ISO 7213:1981, IDT)
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Moisture content
Moisture content in paper, board, pulp. In fact, it is the ratio -- of the mass which is
reduced after the specimen is dried according to the specified method TO the mass
at the time of sampling. Usually, it is expressed as a percentage.
3.2
Constant weight
When the specimens of paper, board, pulp are dried at a specific temperature, until
the difference in the mass of the specimen in two consecutive weighings does not
exceed 0.1% of the mass of the specimen before drying, it reaches the constant
weight.
4 Principle
Weigh the mass of the specimen before drying. Then dry the specimen to a constant
weight. Weigh the mass again. The ratio -- of the difference between the mass of the
specimen before and after drying TO the mass before drying -- is the moisture content
of the specimen.
5 Instruments
5.1 Balance: The sensitivity is 0.0001 g.
5.2 Specimen container: It is used for specimen transfer and weighing. The container
shall be made of lightweight material, which is resistant to water vapor AND does not
change easily under test conditions.
5.3 Oven: The temperature can be kept at 105 °C ± 2 °C.
5.4 Dryer.
6 Preparation of the container
A sufficient number of clean and dry containers shall be numbered and equilibrated, in
atmosphere, prior to sampling; then each container shall be weighed and capped, until
the specimen is loaded.
7 Sampling
Sampling shall be carried out, in accordance with the provisions of GB/T 740 and GB/T
450.
Note: If the sampling place is warm and humid, it shall avoid the contamination of the sample
or the loss of moisture. It is best to wear rubber gloves when operating. In order to avoid changes
in the moisture content of the samples, due to exposure to the atmosphere, the samples shall be
packed into containers, immediately after sampling.
...... Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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