GB/T 7977-2007 English PDF

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GB/T 7977-2007: Paper, board and pulps -- Determination of conductivity of aqueous extracts
Status: Valid

GB/T 7977: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 7977-2007	239	Add to Cart	3 days	Paper, board and pulps -- Determination of conductivity of aqueous extracts	Valid
GB/T 7977-1987	199	Add to Cart	2 days	Paper board and pulps--Determination of the electrical conductivity for the water extract	Obsolete

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Basic data

Standard ID: GB/T 7977-2007 (GB/T7977-2007)
Description (Translated English): Paper, board and pulps -- Determination of conductivity of aqueous extracts
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Y30
Classification of International Standard: 85-10
Word Count Estimation: 9,916
Date of Issue: 2007-12-05
Date of Implementation: 2008-09-01
Older Standard (superseded by this standard): GB/T 7976-1987; GB/T 7977-1987
Quoted Standard: GB/T 450; GB/T 740; GB/T 741
Adopted Standard: ISO 6587-1992, MOD
Regulation (derived from): China National Standard Approval Announcement2007 No.12 (Total No.112)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the paper, paperboard and pulp water extraction method for measuring the conductivity of the liquid. This standard applies to including electrical insulating paper and paperboard, including a variety of paper, paperboard and pulp.

GB/T 7977-2007: Paper, board and pulps -- Determination of conductivity of aqueous extracts

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Paper, board and pulps. Determination of conductivity of aqueous extracts ICS 85-10 Y30 National Standards of People's Republic of China Replacing GB/T 7976-1987, GB/T 7977-1987 Paper, paperboard and pulp Determination of conductivity of aqueous extracts (ISO 6587.1992, MOD) Posted 2007-12-05 2008-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This revised standard adopts ISO 6587.1992 "Paper, paperboard and pulp measurement of electric conductivity of aqueous extracts" (in English). This standard is the international standard ISO 6587.1992 The main differences are as follows. --- Clear scope This standard applies to include an insulating paper and paperboard used in electrical measurement (Chapter 1 of this standard); --- Normative references to international standard ISO 6587 referenced into with the corresponding national standards (this standard Chapter 2); --- Canceled 4.2 (Chapter 4 standard) ISO 6587 in; --- ISO 6587 modified as described in Chapter 5, the increase in the content of the instrument (Chapter 5 of this standard); --- Revised ISO 6587 in Chapter 6, the ISO standard to the corresponding national standards, in addition to 6.3 terms ISO 287 (this Chapter 6 standards); --- Canceled determination ISO 6587 in terms of cell constant of 7.1, modifying the expression test procedure, an increase of 7.1 Terms party 7.2 Terms and method a second method, and an increase in the boiling water bath method clause 7.2.2.2 (Chapter 7 of this standard); --- Revised ISO 6587 in Chapter 8 Expression of results (Chapter 8 of this standard); --- Increased quality assurance and control (Chapter 9 of this standard); --- Modify the conductivity represents a unit (4,5,8,10 Chapter of this standard). Contrast this with the ISO standard configuration are listed in Appendix A. The technical differences between the ISO standards listed in Appendix B. This standard replaces GB/T 7976-1987 "insulating paper and paperboard water extract conductivity measurement", GB/T 7977-1987 "paper Pulp, paper and board Determination of liquid water extract conductivity. " This standard and GB /7976-1987 7977-1987 compared to major changes in T and GB/T as follows. --- Increasing the foreword; --- Modify the scope, clear This standard applies, including electrical insulating paper and paperboard used in measurement (1987 edition Chapter 1, Excerpts Chapter 1); --- Increasing the normative references (Chapter 2 of this edition); --- Increased principles (Chapter 3 of this edition); --- Modify the reagent requirements (1987 Edition Chapter 3, Chapter 4 of this edition); --- Modify the instrument specifications (1987 edition Chapter 2, Chapter 5 of this edition); --- The test results of the calculation procedure is divided into two chapters, modify the test procedure increases the insulating paper and board - Determination of water extract party Method, second method increases the cold extraction method, the heating plate method, modify the representation of the results (1987 Edition Chapter 6, 7th edition, Chapter 8); --- Increased quality assurance and control (Chapter 9 of this edition); --- Increasing the test report (Chapter 10 of this edition); --- Modify the conductivity represents a unit (first edition 1987 2,3,6 chapter, Chapter 4,5,8,10 this edition); --- Added Appendix A (informative) This standard and ISO 6587.1992 reg number control; --- Added Appendix B (informative) This standard and ISO 6587.1992 technical differences and why. The Standard Appendix A and Appendix B are informative. The standard proposed by China National Light Industry Council. This standard by the National Standardization Technical Committee of the paper industry. This standard by the People's Republic of China SZCIQ responsible for drafting. The main drafters of this standard. Xu Rong, Jiang Yan. This standard replaces the standards previously issued as follows. --- GB/T 7976-1987, GB/T 7977-1987. This standard by the National Standardization Technical Committee is responsible for interpreting the paper industry. Paper, paperboard and pulp Determination of conductivity of aqueous extracts

1 Scope

This standard specifies the method for determination of paper, paperboard and pulp extract water conductivity. This standard applies, including electrical insulating paper and cardboard, including a variety of paper, board and pulp.

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 to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 450 paper and pattern samples taken (GB/T 450-2002, eqv ISO 186.1994) GB/T 740 pulp samples taken (GB/T 740-2003, ISO 7213.1991, IDT) GB/T 741 Determination of pulp sample moisture (GB/T 741-2003, ISO 638. 1978, MOD) Principle 3 100mL boiled or treated with cold distilled or deionized water extract certain amount of sample 1h, then at a predetermined temperature with a conductivity meter Determination of conductivity extract liquid.

4 Reagents

After all tests should use distilled or deionized water blank test, the conductivity should not exceed 2μS/cm. Note 1. The test is usually distilled water only to have to go ion. To ensure that the conductivity of the test water to meet the requirements, should be carefully examined in the tests used glassware Cleanliness. Note 2. The detection of non-insulating paper, paperboard and pulp, such as distilled or deionized water less than the required purity, you can use a higher conductivity of the water, but it should be in the test Inspection report described the water conductivity.

5 Instruments

This standard uses the following general laboratory instruments and equipment 5.1 250mL grinding mouth Erlenmeyer flask, a condenser, 100mL stoppered Erlenmeyer flask. Note. All glassware application boiled distilled or deionized water rinse carefully. Conductivity Meter 5.2, select the appropriate level and range of instruments to ensure that the relative error test is within ± 5%. 5.3 electric heating plate, at least adjustable to 200W. 5.4 temperature water bath, to a boiling water bath. 5.5 constant temperature water bath, make the temperature is maintained at (23 ± 0.5) ℃ and (25 ± 0.5) ℃.

6 Sample and preparation

6.1 Sampling Pulp sample taken in accordance with the provisions of GB/T 740 were taken paper and cardboard samples carried out according to the provisions of GB/T 450's. 6.2 Preparation of the sample The samples were cut or torn about the size of 5mm × 5mm sample and mix well. The operation should wear clean gloves, carefully pick, anti ......

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