National foreword

This British Standard is the UK implementation of EN ISO 17947‑1:2026. It is identical to ISO 17947‑1:2026. It supersedes BS EN ISO 17947:2023, which is withdrawn.

The UK participation in its preparation was entrusted to Technical Committee RPI/13, Advanced technical ceramics.

A list of organizations represented on this committee can be obtained on request to its committee manager.

Contractual and legal considerations

This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BSI in relation to the adequacy, accuracy, completeness or reasonableness of this publication. All and any such responsibility and liability is expressly disclaimed to the full extent permitted by the law.

This publication is provided as is, and is to be used at the recipient’s own risk.

The recipient is advised to consider seeking professional guidance with respect to its use of this publication.

This publication is not intended to constitute a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2026.

This European Standard was approved by CEN on 25 April 2026.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and United Kingdom.

European foreword

This document (EN ISO 17947‑1:2026) has been prepared by Technical Committee ISO/TC 206 "Fine ceramics" in collaboration with Technical Committee CEN/TC 184 “Advanced technical ceramics” the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2027, and conflicting national standards shall be withdrawn at the latest by May 2027.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 17947:2023.

Any feedback and questions on this document should be directed to the users’ national standards body/national committee. A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United Kingdom.

Endorsement notice

The text of ISO 17947‑1:2026 has been approved by CEN as EN ISO 17947‑1:2026 without any modification.

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of ISO document should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

ISO draws attention to the possibility that the implementation of this document may involve the use of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s) which may be required to implement this document. However, implementers are cautioned that this may not represent the latest information, which may be obtained from the patent database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.

Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 206, Fine ceramics, in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 184, Advanced technical ceramics, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This first edition of ISO 17947‑1 cancels and replaces ISO 17947:2014, which has been technically revised.

A list of all parts in the ISO 17947 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

Introduction

This document has been developed from Japanese Industrial Standard JIS R 1603:2007^[1^] with reference to CEN ENV 14226:2002^[2^] and ASTM C1494‑01:2007^[3^], and is applicable to the chemical analysis of silicon nitride raw powders for fine ceramics use. This document covers both major and minor constituents, such as silicon, nitrogen, and some trace metallic and non-metallic elements.

1 Scope

This document specifies methods for the determination of silicon, nitrogen, aluminium, iron, calcium, oxygen, carbon, fluorine, and chlorine in silicon nitride powders.

This document is applicable for the chemical analysis of silicon nitride powders used as raw material for fine ceramics.

2 Normative references

3 Terms and definitions

4 Analytes and ranges

5 Preparation of test sample

5.1 General

5.2 Sampling

5.3 Drying

5.4 Weighing

6 Apparatus and reagents

7 Blank test

8 Determination of silicon

8.1 Classification of determination methods

8.2 Fusion‑dehydration/insolubilization separation‑gravimetry and ICP-OES

8.3 XRF using fused cast-bead method

9 Determination of nitrogen

9.1 Classification of determination methods

9.2 Acid pressure decomposition‑distillation separation‑acidimetric titration method

9.3 Inert gas fusion‑thermal conductivity method

9.4 Fusion‑ammonia separation‑acidimetric titration method

10 Determination of aluminium, iron, and calcium

10.1 Principle

10.2 Reagents

10.3 Apparatus

10.4 Procedure

10.5 Blank test

10.6 Calibration

10.7 Calculation

11 Determination of oxygen

11.1 Principle

11.2 Reagents

11.3 Apparatus

11.4 Instrument

11.5 Procedure

11.6 Blank test

11.7 Calculation of calibration coefficient

11.8 Calculation

12 Determination of carbon

12.1 Classification of determination methods

12.2 Combustion (induction furnace)‑IR absorption spectrometry

12.3 Combustion (resistance furnace)‑coulometry

12.4 Combustion (resistance furnace)‑thermal conductivity

13 Determination of fluorine and chlorine

13.1 Principle

13.2 Reagents

13.3 Apparatus

13.4 Procedure

13.5 Blank test

13.6 Calibration

13.7 Calculation

14 Reporting analytical values

14.1 Number of analyses

14.2 Evaluation of analytical values

14.3 Expression of analytical values

15 Test report

Bibliography