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 2015
© ISO 2015
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ii © ISO 2015 – All rights reserved

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
Foreword
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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

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 (
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