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GB/T 21781-2008 English PDF

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GB/T 21781-2008: Test methods for melting point and melting range of chemical products -- Capillary tube method
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Basic data

Standard ID GB/T 21781-2008 (GB/T21781-2008)
Description (Translated English) Test methods for melting point and melting range of chemical products -- Capillary tube method
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard A80
Classification of International Standard 13.300
Word Count Estimation 9,922
Date of Issue 2008-05-12
Date of Implementation 2008-09-01
Quoted Standard GB/T 514; GB/T 8170; JIS K0050; JIS K0211; JIS R3503; Japanese Pharmacopoeia (12th Revision)
Adopted Standard JIS K0064-1992, IDT
Regulation (derived from) Announcement of Newly Approved National Standards No. 7 of 2008 (No. 120 overall)
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 chemical melting and melting range of the test method capillary method. This standard applies to chemicals Determination of melting point and melting range is the temperature range from room temperature to 300��C higher than the general method.

GB/T 21781-2008: Test methods for melting point and melting range of chemical products -- Capillary tube method


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Test methods for melting point and melting range of chemical products. Capillary tube method ICS 13.300 A80 National Standards of People's Republic of China Melting point and melting range of test methods for chemicals Capillary method Posted 2008-05-12 2008-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard is equivalent to using JISK0064.1992 "Determination of chemical melting point and melting range" (in English). This standard is managed by the National Standardization Technical Committee chemicals dangerous (SAC/TC251) and focal points. This standard was drafted. Guangdong Entry-Exit Inspection and Quarantine Hubei, Shenzhen CIQ. The main drafters of this standard. Liu Yingfeng, Zhaicui Ping, ZHOU Ming-hui, Li Dan, Homocysteine \u200b\u200bon Zheng Jianguo, Cui Hairong, Guo Jian, Li Ying, Li Qingxiang. This standard is the first release. Melting point and melting range of test methods for chemicals Capillary method

1 Scope

This standard specifies the test methods for melting point and melting range of chemicals - capillary method. This standard applies to chemicals and determination of melting range of the melting point is higher than the temperature range from room temperature to 300 ℃ general method. Note 1. m.p. suitable material having a defined melting point. Note 2. The melting range of suitable (such as glass, amorphous form, or a multicomponent mixture, such as oils, fats, waxes, vaseline, etc.) without a defined melting point substance. Note 3. If the other individual product testing methods or standards of a series of products are not specified in this standard method is recommended according to the standard method test. Note 4. The method described in this standard is the general method for secure very good chemicals. For some chemicals, due to their volatility, explosive or radiation Shoot, can not guarantee the safety test, do not apply this standard.

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 514 Petroleum products test glass liquid thermometer technical conditions GB/T 8170 numerical rounding rules JISK0050 rules for chemical analysis JISK0211 term analysis chemistry (general part) JISR3503 chemical analysis of glassware Japanese Pharmacopoeia (12th revised edition)

3 Terms and Definitions

Terms and definitions established JISK0050 and JISK0211 apply to this standard.

4 General requirements

This standard measuring method shall comply with the general requirements JISK0050 requirements. JISR3503 glassware should meet the requirements of rounding off should meet the standard GB/T 8170 requirements. Test Method 5 melting point The method can determine the melting point of any of the following methods. a) visual method; b) instrument method. 5.1 visual method 5.1.1 Principle of the method Heated heat transfer liquid sample is placed in a glass capillary, the melting point by visual observation. 5.1.2 Apparatus and equipment 5.1.2.1 melting point apparatus The capillary tube containing the sample is fixed on the thermometer, so that the capillary portion containing the sample is close to the thermometer mercury ball in the middle, will Immersing a heating device in the center of the heat transfer liquid from the bottom 20mm high position, as shown in Fig.

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