EN ISO 3953:2025
(Main)Metallic powders - Determination of tap density (ISO 3953:2025)
Metallic powders - Determination of tap density (ISO 3953:2025)
This document specifies a method for the determination of tap density, i.e. the density of a powder that has been tapped into a container under specified conditions.
Pulvermetallurgie - Bestimmung der Klopfdichte (ISO 3953:2025)
Poudres métalliques - Détermination de la masse volumique après tassement (ISO 3953:2025)
Le présent document spécifie une méthode de détermination de la masse volumique après tassement, c’est-à-dire la masse volumique d’une poudre ayant été tassée dans un récipient, dans des conditions spécifiques.
Kovinski praški - Ugotavljanje gostote po usedanju (ISO 3953:2025)
General Information
- Status
- Published
- Publication Date
- 21-Oct-2025
- Technical Committee
- CEN/SS M11 - Powder metallurgy
- Current Stage
- 6060 - Definitive text made available (DAV) - Publishing
- Start Date
- 22-Oct-2025
- Completion Date
- 22-Oct-2025
Relations
- Effective Date
- 06-Dec-2023
Overview
EN ISO 3953:2025 - Metallic powders: Determination of tap density (ISO 3953:2025) specifies a standardized laboratory method to measure the tap density of metallic powders - the bulk density achieved after a powder is mechanically tapped into a calibrated container under defined conditions. Published by ISO and adopted by CEN as EN ISO 3953:2025 (superseding the 2011 edition), this fifth edition includes a precision statement based on an inter‑laboratory study.
Key topics and technical requirements
- Scope: Procedure for determining tap density of metallic powders when tapped into a container under specified apparatus and conditions.
- Apparatus: balance (0.1 g accuracy), graduated glass cylinder (100 cm3 or 25 cm3, specific graduations), and a tapping apparatus with a 3 mm stroke and tapping frequency between 100–300 taps/min (figure example provided).
- Sampling & test portions: Table of required sample masses by apparent density and cylinder capacity (e.g., 100 cm3 or 25 cm3 options) and guidance on testing three test portions where possible.
- Procedure: Clean cylinder, weigh test portion, pour to a level surface, tap until no further volume decrease (practical guidance: determine minimum taps N and typically use 2N for subsequent tests; fine refractory powders may require up to 3 000 taps).
- Measurement & expression of results: Tap density ρt = m / V (g/cm3). Reading resolution specified (±0.5 cm3 for 100 cm3 cylinder, ±0.2 cm3 for 25 cm3) and rounding rules for reported means.
- Precision: Repeatability and reproducibility statistics from a multi‑laboratory study are included for representative powders (water‑atomized iron, gas‑atomized 316L, sub‑micron WC); limits for r and R at 95% confidence are provided.
- Test report: Mandatory items to include (reference to ISO 3953:2025, sample ID, drying procedure if applied, cylinder capacity, sample mass, result, deviations or optional operations, any events affecting results).
Practical applications and users
EN ISO 3953:2025 is used for quality control, material specification and R&D where bulk behavior of metallic powders matters. Typical users include:
- Powder metallurgy producers and laboratories
- Additive manufacturing (metal AM) material qualification teams
- Sintering and pressing process engineers
- Materials testing and accreditation labs
- Purchasing/specification engineers who require standardized density data in supply contracts
Measured tap density supports process control (filling, flow, compaction), powder characterization, batch comparisons, and specification compliance for powder metallurgy and metal additive manufacturing applications.
Related standards
- ISO 5725‑2 (Accuracy - repeatability and reproducibility): cited for the precision study methodology and referenced in the bibliography.
Frequently Asked Questions
EN ISO 3953:2025 is a standard published by the European Committee for Standardization (CEN). Its full title is "Metallic powders - Determination of tap density (ISO 3953:2025)". This standard covers: This document specifies a method for the determination of tap density, i.e. the density of a powder that has been tapped into a container under specified conditions.
This document specifies a method for the determination of tap density, i.e. the density of a powder that has been tapped into a container under specified conditions.
EN ISO 3953:2025 is classified under the following ICS (International Classification for Standards) categories: 77.160 - Powder metallurgy. The ICS classification helps identify the subject area and facilitates finding related standards.
EN ISO 3953:2025 has the following relationships with other standards: It is inter standard links to EN ISO 3953:2011. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase EN ISO 3953:2025 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2025
Kovinski praški - Ugotavljanje gostote po usedanju (ISO 3953:2025)
Metallic powders - Determination of tap density (ISO 3953:2025)
Pulvermetallurgie - Bestimmung der Klopfdichte (ISO 3953:2025)
Poudres métalliques - Détermination de la masse volumique après tassement (ISO
3953:2025)
Ta slovenski standard je istoveten z: EN ISO 3953:2025
ICS:
77.160 Metalurgija prahov Powder metallurgy
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 3953
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2025
EUROPÄISCHE NORM
ICS 77.160 Supersedes EN ISO 3953:2011
English Version
Metallic powders - Determination of tap density (ISO
3953:2025)
Poudres métalliques - Détermination de la masse Pulvermetallurgie - Bestimmung der Klopfdichte (ISO
volumique après tassement (ISO 3953:2025) 3953:2025)
This European Standard was approved by CEN on 6 October 2025.
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 COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 3953:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 3953:2025) has been prepared by Technical Committee ISO/TC 119 "Powder
metallurgy" in collaboration with CCMC.
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 April 2026, and conflicting national standards shall be
withdrawn at the latest by April 2026.
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 3953:2011.
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 3953:2025 has been approved by CEN as EN ISO 3953:2025 without any modification.
International
Standard
ISO 3953
Fifth edition
Metallic powders — Determination
2025-10
of tap density
Poudres métalliques — Détermination de la masse volumique
après tassement
Reference number
ISO 3953:2025(en) © ISO 2025
ISO 3953:2025(en)
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
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Email: copyright@iso.org
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Published in Switzerland
ii
ISO 3953:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 1
5 Sampling . 3
6 Procedure . 3
7 Expression of results . 4
8 Precision . 4
9 Test report . 5
Bibliography . 6
iii
ISO 3953:2025(en)
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
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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 t
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