ISO 11500:2022/Amd 1:2026

• Status: Published
• Publication Date: 10-Aug-2026
• ICS: 23.100.60 - Filters, seals and contamination of fluids
• Technical Committee: ISO/TC 131/SC 6 - Contamination control
• Drafting Committee: ISO/TC 131/SC 6/WG 2 - Filter and separator evaluation
• Current Stage: 6060 - International Standard published
• Start Date: 11-Aug-2026
• Due Date: 10-Oct-2026
• Completion Date: 11-Aug-2026

• Amends: ISO 11500:2022 - Hydraulic fluid power — Determination of the particulate contamination level of a liquid sample by automatic particle counting using the light-extinction principle
• Effective Date: 12-Oct-2024

Overview

ISO 11500:2022/Amd 1:2026 is an amendment to the internationally recognized standard for determining particulate contamination levels in hydraulic fluids using automatic particle counting with the light-extinction principle. Developed by the International Organization for Standardization (ISO), this standard is essential for industries relying on hydraulic systems, ensuring reliable and repeatable measurement of contamination in liquid samples. The amendment focuses on updates to sample bottle requirements and revised criteria for glassware cleanliness, supporting higher accuracy in contamination assessment processes.

Key Topics

• Hydraulic Fluid Contamination Measurement: The standard specifies procedures for assessing the particulate contamination of hydraulic fluids, which is critical for system reliability and component longevity.
• Automatic Particle Counting (APC): The testing method utilizes automatic particle counters that operate on the light-extinction principle to provide quantitative contamination data.
• Sample Bottle Requirements: The amendment clarifies specifications for sample bottles, including materials, capacity, sealing, and cleanliness requirements.
• Glassware Cleanliness: Updated recommended limits for particle contamination in sample bottles and glassware are outlined, emphasizing minimal interference in analytical results.
• Verification and Cleaning: Guidance aligns with existing standards, such as ISO 3722, for verifying glassware and sample bottle cleanliness.

Applications

ISO 11500:2022/Amd 1:2026 is widely applicable in industries and laboratory environments focused on hydraulic systems. Key practical applications include:

• Hydraulic System Maintenance: Used by maintenance teams to monitor oil cleanliness, enabling predictive maintenance and reducing system failures caused by particulate contamination.
• Component Manufacturing: Helps manufacturers of hydraulic components and systems ensure that supplied fluids meet required cleanliness standards at delivery and during operation.
• Contamination Control: Essential for organizations setting guidelines and procedures for contamination control in hydraulic and fluid power applications.
• Quality Assurance Laboratories: Provides standard methods for laboratories conducting routine contamination analysis of hydraulic fluids and lubricants.
• Compliance and Certification: Organizations seeking compliance with international best practices for hydraulic system performance benefit from consistent application of this standard.

Related Standards

Several related international standards complement the requirements and methods described in ISO 11500:2022/Amd 1:2026:

• ISO 11500: The base standard for particulate contamination assessment in hydraulic fluids.
• ISO 3722: Sets requirements for cleaning and verifying hydraulic fluid samples, referenced for bottle verification.
• ISO 11171: Specifies calibration of automatic particle counters for particle size determination.
• ISO 4406: Establishes the coding system for reporting fluid cleanliness levels.
• ISO/TC 131: Technical Committee covering fluid power systems and contamination control standards.

Practical Value

Implementing ISO 11500:2022/Amd 1:2026 delivers clear practical value:

• Improved Reliability: Enhanced precision in contamination measurement contributes directly to improved hydraulic system reliability and reduced downtime.
• Cost Savings: Early detection of particulate contamination through standardized testing minimizes costly repairs and component replacements.
• Global Consistency: Adhering to ISO standards enables organizations to achieve global consistency in hydraulic fluid cleanliness management and reporting.
• Regulatory Compliance: Supporting international trade and market access by meeting globally recognized contamination control requirements.

For the latest updates or detailed guidance, users should always refer to the official ISO publication and consider complementary standards relevant to their specific operational context.

International
Standard
ISO 11500
Third edition
Hydraulic fluid power —
2022-12
Determination of the particulate
contamination level of a liquid
AMENDMENT 1
sample by automatic particle
2026-08
counting using the light-extinction
principle
AMENDMENT 1
Transmissions hydrauliques — Détermination du niveau de
pollution particulaire d'un échantillon liquide par comptage
automatique des particules par absorption de lumière
AMENDEMENT 1
Reference number
ISO 11500:2022/Amd.1:2026(en) © ISO 2026

ISO 11500:2022/Amd.1:2026(en)
© ISO 2026
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 11500:2022/Amd.1:2026(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
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)
paten
...

Norme
internationale
ISO 11500
Troisième édition
Transmissions hydrauliques —
2022-12
Détermination du niveau de
pollution particulaire d'un
AMENDEMENT 1
échantillon liquide par comptage
2026-08
automatique des particules par
absorption de lumière
AMENDEMENT 1
Hydraulic fluid power — Determination of the particulate
contamination level of a liquid sample by automatic particle
counting using the light-extinction principle
AMENDMENT 1
Numéro de référence
ISO 11500:2022/Amd.1:2026(fr) © ISO 2026

ISO 11500:2022/Amd.1:2026(fr)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2026
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: [phone]
E-mail: [e-mail]
Web: www.iso.org
Publié en Suisse
ii
ISO 11500:2022/Amd.1:2026(fr)
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux
de normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général
confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de faire
partie du comité technique créé à cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec l'ISO participent également aux travaux. L'ISO collabore étroitement avec
la Commission électrotechnique internationale (IEC) en ce qui concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d'approbation requis pour les différents types de documents ISO. Le présent document
a été rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2
(voir www.iso.org/directives).
L'ISO attire l'attention sur le fait que la mise en application du présent document peut entraîner l'utilisation
d'un ou de plusieurs brevets. L'ISO ne prend pas position quant à la preuve, à la validité et à l'applicabilité de
tout droit de brevet revendiqué à cet égard. À la date de publication du présent document, l'ISO n’avait pas
reçu notification qu'un ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois,
il y a lieu d'avertir
...