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GB/T 45757-2025Polymer-bonded neodymium iron boron compounds pellets (English PDF)

钕铁硼复合颗粒料

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

June 30, 2025

Implementation date

January 1, 2026

Scope

GB/T 45757-2025 is the English-translated version of 钕铁硼复合颗粒料.

GB/T 45757-2025 is the Chinese national standard covering the granulated feedstock of NdFeB powder in a thermoplastic binder that is injection moulded into magnets — the split into isotropic and anisotropic grades, the magnetic properties of the moulded material, the melt flow rate that decides whether the compound fills a thin cavity at all, the density and the tensile, flexural and impact behaviour of the plastic, the test methods, and the inspection rules and packaging. First edition, in force from 1 January 2026. Issued on 30 June 2025, it has been in force since 1 January 2026.

Document preview — GB/T 45757-2025

National Standard of the People's Republic of China

ICS: 77.120.99
Classification: H 65

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword
1 Scope
2 Normative references
3 Terms and Definitions
3.1 functional materials
4 Classification and brand
4.1 Classification

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.

This document was proposed and coordinated by the National Rare Earth Standardization Technical Committee (SAC/TC229).

This document was drafted by: Hangzhou Qianshi Technology Co., Ltd., Jiangxi Zhongshi New Materials Co., Ltd., Shanghai Sanhuan Magnetic Materials Co., Ltd., Hangzhou Sanhua Research Institute Co., Ltd., Youyan Rare Earth High-Tech Co., Ltd., Hangzhou Kede Magnetics Co., Ltd., Ningbo Yunsheng Bonded Magnet Co., Ltd.

Company, Hangzhou Quadrant Technology Co., Ltd., Hangzhou Meici Technology Co., Ltd., Youyan Rare Earth New Materials Co., Ltd., Qiandong Rare Earth Group Co., Ltd.

Co., Ltd., Zhejiang University of Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Baotou Rare Earth Research Institute, China Rare Earth Tianma New Materials Technology Co., Ltd., Ningbo Zhaobao Magnetics Co., Ltd., and Nonferrous Metals Technology and Economics Research Institute Co., Ltd.

The main drafters of this document are: Zhao Ningning, Chen Haibo, Wang Yongjie, Cai Wei, Shen Senqi, Lian Jiangbin, Zheng Jingwu, Guo Xiaoyan, Wang Fan, Li Rongyao, Tang Chengcheng, Peng Haijun, Qian Kezhe, Zhang Chaoyue, Zhang Weishan, Wang Wei, Yu Hongfeng, Ding Kewang, Zhan Lichun, Chen Siyuan, Wang Zilong, Luo Yang, Yao Nanhong, Qiao Liang, Sun Yingli, Gao Yan, Gao Xigui, Cheng Junfeng, Yang Yuanfei, Jia Shengli, Zhou Yao, Shi Jinfang, Guo Sizhuo, Song Guanyu, Shen Lihan, and Wu Cenyang. NdFeB composite granules

1 Scope

This document specifies the classification and grade, technical requirements, test methods, inspection rules, packaging, marking, transportation, Storage and travel documents.

This document applies to the preparation of NdFeB composite particles used in the injection molding of magnets.

2 Normative references

GB/T 1033.1-2008

GB/T 1040.2-2022

GB/T 1843

GB/T 3217

GB/T 3682.1

GB/T 8170

GB/T 9341

GB/T 9637

GB/T 13560

GB/T 15676

GB/T 17951

GB 39176

3 Terms and Definitions

The terms and definitions defined in GB/T 9637, GB/T 13560, GB/T 15676, GB/T 17951 and the following terms and definitions apply to this document.

3.1 functional materials

The composite material is made of NdFeB powder as the matrix, thermoplastic resin as the binder, and appropriate amount of additives. It is used for injection molding after extrusion granulation.

4 Classification and brand

4.1 Classification

NdFeB composite particles can be divided into two categories. isotropic and anisotropic according to the magnetic orientation characteristics of NdFeB powder.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 17 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 1033.1-2008 · GB/T 1843 · GB/T 3217 · GB/T 3682.1 · GB/T 9341 · GB/T 9637 · GB/T 17951

Editions of GB/T 45757

Edition	Title	Revision	Status
GB/T 45757-2025	Polymer-bonded neodymium iron boron compounds pellets	current edition	Current

This page sells the current edition, GB/T 45757-2025. Earlier editions are listed for reference only.

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