GB/T 8301-2008 English PDF

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GB/T 8301-2008: Natural rubber latex concentrate -- Determination of mechanical stability
Status: Valid

GB/T 8301: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 8301-2008	134	Add to Cart	3 days	Natural rubber latex concentrate -- Determination of mechanical stability	Valid
GB/T 8301-2001	279	Add to Cart	3 days	Natural rubber latex concentrate -- Determination of mechanical stability	Obsolete
GB/T 8301-1987	RFQ	ASK	3 days	Natural rubber latex concentrate--Determination of mechanical stability	Obsolete

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Basic data

Standard ID: GB/T 8301-2008 (GB/T8301-2008)
Description (Translated English): Natural rubber latex concentrate -- Determination of mechanical stability
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: B72
Classification of International Standard: 83.060
Word Count Estimation: 7,712
Date of Issue: 2008-05-15
Date of Implementation: 2008-11-01
Older Standard (superseded by this standard): GB/T 8301-2001
Quoted Standard: GB/T 6003.1; GB/T 8290; GB/T 8298; GB/T 8300; ISO/TR 9272
Adopted Standard: ISO 35-2004, IDT
Regulation (derived from): National Standard Approval Announcement 2008 No.8 (Total No.121)
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 determination of concentrated natural rubber latex mechanical stability. This standard also applies to pre-vulcanized natural rubber latex concentrate. This method may not be suitable for preservation with potassium hydroxide latex and natural rubber latex Hevea brasiliensis latex outside, this method does not apply to synthetic latex.

GB/T 8301-2008: Natural rubber latex concentrate -- Determination of mechanical stability

---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.
Natural rubber latex concentrate. Determination of mechanical stability ICS 83.060 B72 National Standards of People's Republic of China GB/T 8301-2008/ISO 35.2004 Replacing GB/T 8301-2001 Determination of mechanical stability of natural rubber latex concentrate (ISO 35.2004, IDT) Posted 2008-05-15 2008-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard is equivalent translation ISO 35.2004 "Natural rubber latex concentrate Determination of mechanical stability" (in English) and its amendments ISO 35. 2004/Amd. 1.2006 (in English). For ease of use, the editorial changes made the following standard. --- "This International Standard" be replaced by "this standard"; --- Delete foreword international standards; --- References GB/T 6003.1, GB/T 8290, GB/T 8298 in Chapter 2, normative references, these standards and There is no technical difference in the corresponding part of 2004. ISO 35. This standard replaces GB/T 8301-2001 "Natural rubber latex concentrate - Determination of mechanical stability." The main difference compared with the standard GB/T 8301-2001 as follows. --- Deleted the ISO foreword; --- In Chapter 2 normative references added GB/T 14838 "Rubber and rubber products precision test method standards determine"; --- In Chapter 3, the terms and definitions in increased mechanical stability of the contents; --- In Chapter 6, the instrument adds transparent flat-bottomed pan and pointed stick, and the original 6.2 to heating method heating apparatus; --- In Chapter 8, the procedure adds two methods to determine the end point of the (palm method and water dispersion method) details, and section 11 Chapter test report has been modified in the content; --- Added "precision instructions" chapter. The standard proposed by China Petroleum and Chemical Industry Association. This standard by the National Standardization Technical Committee rubber products natural rubber and rubber Technical Committee. This standard was drafted. Chinese Academy of Tropical Agriculture of the processing of agricultural products, the Ministry of Agriculture Food Quality Supervision and Testing Center (Zhanjiang). The main drafters of this standard. Chen Chenghai, Huang Maofang, COOKING use, Du group. This standard was first released in July 1987, in July 2001 the first amendment. GB/T 8301-2008/ISO 35.2004 Determination of mechanical stability of natural rubber latex concentrate Warning. Use of this standard shall have a person experiences regular lab work. This standard does not point out all possible security issues. Users have the responsibility to take appropriate safety and health practices and to ensure compliance with the conditions relevant national regulations.

1 Scope

This standard specifies the method for the determination of the concentrated natural rubber latex mechanically stable, this standard also applies to pre-vulcanized natural rubber latex concentrate. This method may not apply to potassium hydroxide stored latex and natural rubber latex of Hevea brasiliensis latex other than this Act does not apply to Synthetic latex.

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 6003.1 woven wire mesh test sieve (GB/T 6003.1-1997, eqv ISO 3310-1.1990) GB/T 8290 Natural rubber latex concentrate sampling (GB/T 8290-1987, eqv ISO 123. 1985) GB/T 8298 Natural rubber latex concentrate - Determination of total solids content (GB/T 8298-2008, ISO 124.1997, MOD) GB/T 8300 Natural rubber latex concentrate - Determination of alkalinity (GB/T 8300-2008, ISO 125.2003, IDT) ISO /T R9272 Rubber and rubber products - Determination of precision for test method standards (ISO /T R9272.2004, Rubberand rubberproducts-Determinationofprecisionfortestmethodstandards)

3 Terms and Definitions

The following terms and definitions apply to this standard. 3.1 Ammonia and/or other preservatives, and processed through some kind of concentrated natural rubber latex. 3.2 Latex under specified conditions, starting to see the time required for flocculation tablets, expressed in seconds. Principle 4 The total solid content of natural rubber latex concentrate sample diluted to a mass fraction of 55%, then stirred at high speed. Record when initially visible flocculation The time required, as a measure of the degree of mechanical stability.

5 Reagents

Ammonia solution (5.1 and 5.2) should be used to confirm the preparation of analytical grade ammonia, and should be stored in airtight containers. In the local regulations of water, use distilled water or without carbon dioxide equivalent purity water. 5.1 ammonia solution containing 1.6% (mass fraction) of ammonia (NH3), alkalinity for at least 0.30% (relative to the concentrated latex) of latex concentrate. 5.2 ammonia solution containing 0.6% (mass fraction) of ammonia (NH3), for alkalinity 0.30% or less (with respect to the concentrated latex) liquid latex shrink.

6 Instruments

6.1 degree of mechanical stability tester include. 6.1.1 to 6.1.3 components. GB/T 8301-2008/ISO 35.2004 ......

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