GB/T 33317: Evolution and historical versions
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| GB/T 33317-2025 | English | RFQ |
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(Plastics - Determination of hexamethylenetetramine content in phenolic resins - Kjeldahl method, perchloric acid method and hydrochloric acid method)
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GB/T 33317-2025
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| GB/T 33317-2016 | English | 199 |
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Plastics -- Phenolic resins -- Determination of hexamethylenetetramine content -- Kjeldahl method, perchloric acid method and hydrochloric acid method
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GB/T 33317-2016
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Basic data | Standard ID | GB/T 33317-2025 (GB/T33317-2025) | | Description (Translated English) | (Plastics - Determination of hexamethylenetetramine content in phenolic resins - Kjeldahl method, perchloric acid method and hydrochloric acid method) | | Sector / Industry | National Standard (Recommended) | | Date of Implementation | 2026-05-01 | | Older Standard (superseded by this standard) | GB/T 33317-2016 | | Issuing agency(ies) | State Administration for Market Regulation; Standardization Administration of China | GB/T 33317-2016: Plastics -- Phenolic resins -- Determination of hexamethylenetetramine content -- Kjeldahl method, perchloric acid method and hydrochloric acid method
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Plastics - Phenolic resins - Determination of hexamethylenetetramine content - Kjeldahl method, perchloric acid method and hydrochloric acid method
ICS 83.080.01
G31
National Standards of People's Republic of China
Plastic phenolic resin hexamethylenetetramine content
Determination of Kjeldahl Method, Perchloric Acid and Hydrochloric Acid
Kjeldahlmethod, perchloricacidmethodandhydrochloricacidmethod
(ISO 8988..2006, MOD)
2016-12-13 released
2017-07-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Management Committee released
Foreword
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This standard uses the re-drafting method to modify the use of ISO 8988..2006 "plastic phenolic resin hexamethylenetetramine determination of the content
Kjeldahl method, perchloric acid method and hydrochloric acid method ".
There are technical differences between this standard and ISO 8988..2006, and the terms involved in these differences have been passed through the margin
The vertical single line (|) is marked.
The main technical differences between this standard and ISO 8988..2006 are as follows.
--- on the normative reference documents, this standard has made a technical differences in the adjustment to meet China's technical conditions, adjust the situation
The situation is reflected in Chapter 2, "Normative references", as follows.
• Replace ISO 385 with non-equivalent GB/T 12805 for international standards;
--- unified the standard of quality and analytical balance of precision requirements of the unit, unified g; because the international standard in the original quality unit
Not uniform, and some with mg, some with g, inconvenient to use;
- The formula is modified and calculated using the actual concentration of the solution (see 3.6, 5.6); since the concentration of the solution in the international standard is direct
Using 0.10 and 0.20 into the calculation, and the actual concentration of the preparation will be biased, the actual concentration of the solution can be used to improve the results
Accuracy
- Reproducibility in International Standard 3.7 is listed and described in this standard (see 3.7); since Kjeldahl does not have an experiment
Inter Room related data.
This standard is proposed by the China Petroleum and Chemical Industry Association.
This standard by the National Plastics Standardization Technical Committee Thermosetting Plastics Subcommittee (SAC/TC15/SC11) centralized.
The drafting of the standard units. Shandong Shengquan New Materials Co., Ltd., in the blue morning Chemical Research and Design Institute Co., Ltd., Shanghai Europe and Asia
Into the material Co., Ltd., Changshu Southeast Plastic Co., Ltd., Shaxian Hongsheng Plastic Co., Ltd., in the blue morning light Chengdu Detection Technology Co., Ltd., North
Jingleil High Temperature Materials Co., Ltd., Zaoyang Hualian Friction Material Co., Ltd., Hubei Feilong Friction Sealing Material Co., Ltd.
The main drafters of this standard. Tang Hui, Xu Yulian, Wang Yonggui, Chen Ziling, Cui Huimin, Chen Jiwei, Zhao Ping, Liu Li, Zhang Qianwen, Zhou Guoyong.
Plastic phenolic resin hexamethylenetetramine content
Determination of Kjeldahl Method, Perchloric Acid and Hydrochloric Acid
1 Scope
This standard specifies three methods for the determination of hexamethylenetetramine in phenolic resins. These three methods are equivalent. Chapter 3 provides
The Kjeldahl method does not apply to phenolic resins containing other nitrogen compounds. Chapter 4 and Chapter 5 of the perchloric acid and hydrochloric acid method does not apply
Phenolic resins containing other acidic or alkaline substances. If the resin contains additives that can be oxidized by perchloric acid, only Chapter 5 can be used
Prescribed hydrochloric acid method.
2 normative reference documents
The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article
Pieces. For undated references, the latest edition (including all modifications) applies to this document.
GB/T 12805 laboratory glass instrument burette (GB/T 12805-2011, ISO 385..2005, NEQ)
3 Kjeldahl method
WARNING - For safety reasons, Kjeldahl must be carried out in a well-ventilated fume hood.
3.1 General provisions
This article specifies the determination of total nitrogen content of hexamethylenetetramine in phenolic resin. This method is applicable to hexamethylenetetramine
Content of ≥ 0.5% (mass fraction) of phenolic resin.
3.2 Principles
In the presence of the catalyst, the hexamethylenetetramine in the sample was degraded to ammonium bisulfate in concentrated sulfuric acid. Ammonium bisulfate with sodium hydroxide
The reaction produces sodium sulfate and ammonia. Ammonia is distilled off and collected in hydrochloric acid solution. Excess hydrochloric acid is dissolved in standard sodium hydroxide in the presence of an indicator
Liquid titration.
3.3 Reagent
Unless otherwise stated, the reagents used in the analysis are non-nitrogen-containing analytical reagents, and the water used is distilled water or water of comparable purity.
3.3.1 concentrated sulfuric acid. analytical grade.
3.3.2 Kjeldahl mixture. 97 g sodium sulfate hydrate (Na2SO410H2O), 1.5 g copper sulfate pentahydrate (CuSO4.5H2O) and
1.5g selenium (Se) composition.
3.3.3 Sodium hydroxide. 30% (mass fraction) aqueous solution.
3.3.4 hydrochloric acid standard solution. the concentration of 0.10mol/L.
3.3.5 sodium hydroxide standard solution. the concentration of 0.10mol/L.
3.3.6 Mixed Indicator Solution. 60 mg of methyl red and 40 mg of methylene blue were dissolved in 100 mL of ethanol.
3.4 Instruments
Laboratory equipment and the following instruments.
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