ISO 14085-6:2015 PDF

Aerospace series — Hydraulic filter elements — Test methods — Part 6: Initial cleanliness level

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Title (English):

ISO 14085-6:2015

Aerospace series — Hydraulic filter elements — Test methods — Part 6: Initial cleanliness level

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 7
Publication date:: February 26, 2015
Edition:: ISO IS 14085 edition 1 version 1
ICS:: 49.080

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Description (English):

ISO 14085-6:2015 defines a reference method for determining the level of cleanliness of new filter elements for use in aircraft hydraulic systems, after production prior to shipment, or prior to installation in the circuit. It applies to filter elements used on systems requiring fluid cleanliness conditions defined in the particular specification. The tests data resulting from application of this part of ISO 14085 can be used to compare the cleanliness of aerospace hydraulic filter elements.

Technical details

Technical committee: ISO/TC 20/SC 10 - Aerospace fluid systems and components
SKU: ISO 14085-6:2015

Abstract

Overview

ISO 14085-6:2015 - Aerospace series - Hydraulic filter elements - Test methods - Part 6: Initial cleanliness level - defines a reference method for measuring the initial cleanliness of new hydraulic filter elements intended for aircraft hydraulic systems. The standard establishes a repeatable extraction and analysis procedure to quantify built-in particulate contamination after production, before shipment or installation, enabling comparison between filter elements and verification against specified cleanliness requirements.

Key topics and requirements

Purpose: Determine the initial cleanliness level of new filter elements so they do not degrade hydraulic system fluid cleanliness.
Test principle: Install the element in a pre‑cleaned test housing, fill ~2/3 with a specified test liquid, agitate to extract built‑in contaminants, collect the extraction liquid and analyse the entire volume.
Extraction sequence: Multiple extractions (C1, C2, C3, …) are performed until the latest extraction Cn ≤ 0.1 × ∑(C1…Cn) or a maximum of six extractions; if not met, extraction parameters must be revised and retested.
Contaminant analysis methods (Annex A):
- Gravimetric analysis - mass of contaminants via membrane filtration and weighing (ISO 4405 referenced).
- Particle size - microscopy or image analysis to size individual particles (ISO 4407 referenced).
- Particle size distribution - particle counting methods to quantify size classes.
Reporting unit: Contaminant amount expressed per 100 cm of wetted volume of the housing/element assembly.
Quality controls: Clean test liquid (compatible with filter materials and system fluid), pre‑cleaned housing and containers (ISO 3722), and blank checks (housing blank must be

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Standards mentioned in the description

ISO 14085-6:2015 PDF

Technical details

Abstract

Overview

Key topics and requirements

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