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GB/T 462-2008 English PDF (GBT462-2008)

GB/T 462-2008 English PDF (GBT462-2008)

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GB/T 462-2008: Paper, board and pulp -- Determination of moisture content of analytical sample

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.
GB/T 462-2008
NATIONAL STANDARD OF THE
PEOPLE 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.

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