ISO 14085-1:2015

INTERNATIONAL ISO
STANDARD 14085-1
First edition
2015-03-01
Aerospace series — Hydraulic filter
elements — Test methods —
Part 1:
Test sequence
Série aérospatiale — Eléments filtrants hydrauliques — Méthode
d’essais —
Partie 1: Séquence d’essais
Reference number
ISO 14085-1:2015(E)
©
ISO 2015

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ISO 14085-1:2015(E)

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© ISO 2015
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ii © ISO 2015 – All rights reserved

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ISO 14085-1:2015(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test equipment and materials . 1
5 Accuracy of measuring instruments and test conditions . 1
6 Test sample . 1
7 Summary of information required prior to testing . 2
8 Test methods . 2
8.1 1st step — Fabrication integrity test and 1st bubble point value. 2
8.2 2nd step — Identification and marking . 2
8.3 3rd step — Test sequence . 2
9 Data presentation . 2
10 Acceptance criteria or data to be reported . 5
11 Identification statement . 5
Bibliography . 6
© ISO 2015 – All rights reserved iii

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ISO 14085-1:2015(E)

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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
ISO 14085-1 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee
SC 10, Aerospace fluid systems and components.
ISO 14085 consists of the following parts, under the general title Aerospace series — Hydraulic Filter
elements — Test methods:
— Part 1: Test sequence
— Part 2: Conditioning
— Part 3: Filtration efficiency and retention capacity
— Part 4: Verification of collapse/burst pressure rating
— Part 5: Resistance to flow fatigue
— Part 6: Initial cleanliness level
iv © ISO 2015 – All rights reserved

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ISO 14085-1:2015(E)

Introduction
In aerospace hydraulic fluid power systems, power is transmitted and controlled through a liquid
under pressure. The liquid is both a lubricant and power-transmitting medium. The presence of solid
contaminant particles in the liquid interferes with the ability of the hydraulic fluid to lubricate and
causes wear and malfunction of the components. The extent of contamination in the fluid has a direct
bearing in the performance, reliability, and safety of the system, and needs to be controlled to levels that
are considered appropriate for the system concerned.
Filters are used to control the contamination level of the fluid by removing solid contaminant particles,
typically consisting of a filter element enclosed in a filter housing. The filter element is the porous device
that performs the actual process of filtration. The complete assembly is designated as a filter.
Filter element performance is measured by testing, and a series of International Standards have been
developed to quantify performance under specified conditions (
...