GB/T 32684: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 32684-2025 | English | RFQ |
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(Plastics - Phenolic resins - Determination of free formaldehyde content)
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GB/T 32684-2025
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| GB/T 32684-2016 | English | 119 |
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Plastics -- Phenolic resins -- Determination of free formaldehyde content
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GB/T 32684-2016
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Basic data | Standard ID | GB/T 32684-2025 (GB/T32684-2025) | | Description (Translated English) | (Plastics - Phenolic resins - Determination of free formaldehyde content) | | Sector / Industry | National Standard (Recommended) | | Date of Implementation | 2026-05-01 | | Older Standard (superseded by this standard) | GB/T 32684-2016 | | Issuing agency(ies) | State Administration for Market Regulation; Standardization Administration of China | GB/T 32684-2016: Plastics -- Phenolic resins -- Determination of free formaldehyde content---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.
Plastics - Phenolic resins - Determination of free formaldehyde content
ICS 83.080.01
G31
National Standards of People's Republic of China
Plastic phenolic resin
Determination of free formaldehyde content
(ISO 11402..2004, Phenolic, aminoandcondensationresins-
Determinationoffree-formaldehydecontent, MOD)
2016-06-14 release
2017-01-01 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 ISO 11402..2004 "phenolic resin, amino resin and polycondensation resin free formaldehyde
Amount of determination ".
Compared with ISO 11402..2004, the main technical differences and the reasons are as follows.
--- standard name changed to "plastic phenolic resin free formaldehyde content determination";
- Removes the range of "b) amino resin and furan resin (sodium sulfite method). This method is suitable for the use of urea and containing formaldehyde
Melamine polycondensation of the resin and by sugar alcohol and formaldehyde condensation and no further modified resin obtained. c) Condensation
Resin (KCN method), including urea resin, furan resin, melamine resin and phenolic resin, and the combination and modification of these resins
Product ", because this standard only for phenolic resin;
--- 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 15528 with GB/T 3186 equivalent to international standard;
Replace GB 366 with GB/T 6682 with international standard;
--- modified the "4.1 Overview" in the relevant content, because this standard is only for phenolic resin;
The "4.3 Sulfite Process" and "4.4 KCN Procedures" have been removed since this standard is only for phenolic resins;
- Appendix A and Appendix B are deleted (see ISO 11402 Appendix A and Appendix B), since this standard is only for phenolic resins.
For ease of use, this standard has been modified as follows.
--- Deleted the preface of ISO 11402..2004;
- an introduction to the national standard;
--- replace the comma as a decimal point with a decimal point. "
- Removal of normative references not found in the standard text ISO 648. 1977, ISO 385..2005.
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 this standard. Shanghai Eurasian Synthetic Materials Co., Ltd., in the blue dawn Chemical Research and Design Institute Co., Ltd., the national synthetic resin
Quality Supervision and Inspection Center, Changshu Southeast Plastic Co., Ltd., Shaxian Hongsheng Plastic Co., Ltd., Shandong Shengquan Chemical Co., Ltd.
The main drafters of this standard. Chen Ziling, Liu Yong, Zhao Ping, Xu Zhiying, Chen Jiwei, Zhang Zhimin.
Plastic phenolic resin
Determination of free formaldehyde content
1 Scope
This standard specifies the determination of free formaldehyde content in phenolic resin and its modified resin.
This standard is applicable to the determination of free formaldehyde in phenolic resin and its modified resin. The result is only representative of the free
The actual content of formaldehyde, and resin processing process or after processing free formaldehyde content is not directly related.
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 3186 Sampling of raw materials for paints, varnishes and varnishes and varnishes (GB/T 3186-2006, ISO 15528..2000, IDT)
GB/T 6682 Analytical laboratory water specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD)
3 terms and definitions
The following terms and definitions apply to this document.
3.1
Free formaldehyde freeformaldehyde
Formaldehyde, dihydrate formaldehyde (dihydroxymethylene) or polyoxymethylene is present in the condensed resin in the absence of a chemical bond.
4 test method
4.1 Overview
The content of free formaldehyde in phenolic resin and its modified resin was determined by hydroxylamine hydrochloride method.
4.2 Principles
Phenolic resin added hydroxylamine hydrochloride after formaldehyde into oxime, the reaction of hydrochloric acid produced by sodium titanate standard titration solution for titration.
Oxidation reaction equation. CH2O NH2OH · HCl → CH2NOH HCl H2O
4.3 Reagents
Unless otherwise specified, only analytical reagents and analytical water specified in GB/T 6682 are used in the analysis, at least Grade 3 purity
Of water.
4.3.1 Hydroxylamine Hydrochloride. 10% solution, adjusted to pH 3.5 by dropwise addition of sodium hydroxide solution.
4.3.2 sodium hydroxide. standard titration solution, c (NaOH) = 1mol/L, c (NaOH) = 0.1mol/L.
4.3.3 hydrochloric acid. standard titration solution, c (HCl) = 1mol/L, c (HCl) = 0.1mol/L.
4.3.4 Methanol. free of aldehydes and ketones.
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