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
GB/T 462-2008
Paper, board and pulp. Determination of moisture content of analytical sample
ICS 85-010
Y30
National Standards of People's Republic of China
Replacing GB/T 462-2003, GB/T 741-2003
Paper, paperboard and pulp
Moisture measurement sample analysis
(ISO 287. 1985, Paperandboard-Determinationofmoisturecontent-
ISO 638. 1978, pulps-Determinationofdrymattercontent, MOD)
Posted 2009-05-01 2008-08-19 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This revised standard adopts the ISO 287. 1985 "Paper and board Determination of moisture drying method" and ISO 638. 1978 "absolutely dry pulp
Determination of "matter content. This standard and ISO 287. 1985, ISO 638. 1978 Differences in Appendix B.
This standard is GB/T 462-2003 "Paper and board Determination of moisture" GB/T 741-2003 pulp test sample moisture analysis, "
Given "the integration of amendments. This standard also replace the GB/T 462-2003, GB/T 741-2003.
This standard and GB/T 462-2003, GB/T 741-2003 compared to the main changes are as follows.
--- Modify the scope of the standard range for the measurement sample analysis of water;
--- Increased Chapter 3, "Terms and definitions" content, adding a constant weight of terms and definitions;
--- Modify the sample.
The Standard Appendix A, Appendix B is an informative annex.
The standard proposed by China National Light Industry Council.
This standard by the National Standardization Technical Committee of the paper industry.
This standard was drafted. China Pulp and Paper Research Institute.
The main drafters of this standard. Gao Jun.
This standard replaces the standards previously issued as follows.
--- GB/T 462-2003;
--- GB/T 741-2003.
This standard by the National Standardization Technical Committee is responsible for interpreting the paper industry.
Paper, paperboard and pulp
Moisture measurement sample analysis
1 Scope
This standard specifies the method for the determination after sampling paper, paperboard and pulp moisture content.
This standard applies to all kinds of paper, paperboard and pulp, but paper, paperboard and pulp should not contain other than water in the prescribed test temperature
Any substance can lower volatile.
This method is not used for measuring liquid slurry of water, slurry or bulk package measuring quality of sales.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply this standard, however, encourage the parties to reach an agreement on this standard is
Whether the latest versions of these documents, undated reference documents, the latest versions apply to this standard.
GB/T 450 and take samples to an aspect of paper and paperboard samples, positive and negative determination (GB/T 450-2008, ISO 186.
2002, MOD)
GB/T 740 pulp samples taken (GB/T 740-2003, ISO 7213. 1981, IDT)
3 Terms and Definitions
The following terms and definitions apply to this standard.
3.1
Paper, paperboard and pulp in water content. In fact, that is, after the required sample drying method to reduce the quality and the quality of the sampling ratio,
Usually expressed as a percentage.
3.2
Paper, paperboard and pulp sample at a specific temperature drying, until two consecutive weighing, the poor quality of the sample does not exceed the sample before drying
The mass of 0.1%, which reached a constant weight.
Principle 4
Weigh the sample mass before drying, and then the sample is dried to constant weight, weighed mass again. Before the poor quality of the sample before and after drying and drying
Mass ratio, that is, the water sample.
5 Instruments
5.1 Balance. a sense of the amount of 0.0001g.
5.2 Sample container. for sample transfer and weighing. The container should be able to prevent the water vapor, and less prone to change under the experimental conditions of light
Quality material.
5.3 Oven. maintain a constant temperature at 105 ℃ ± 2 ℃.
5.4 dryer.