ISO 4405:2022

Name: ISO 4405:2022 — Hydraulic fluid power — Fluid contamination — Determination of particulate contamination by the gravimetric method
SKU: ISO 4405:2022
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Hydraulic fluid power — Fluid contamination — Determination of particulate contamination by the gravimetric method

Название (английский):

ISO 4405:2022

Hydraulic fluid power — Fluid contamination — Determination of particulate contamination by the gravimetric method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 18
Дата публикации:: 26 июля 2022 г.
Издание:: ISO IS 4405 edition 2 version 1
ICS:: 23.100.60

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Описание (английский):

This document defines the gravimetric method for determining the contamination level of fluids used in hydraulic fluid power systems. The working instructions provided in this document serve for the gravimetric determination of dirt content of pressure fluids from mineral oil with additives. They are used in hydraulic systems with hydrostatic drive.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 4405:2022 - Hydraulic fluid power - Fluid contamination - Determination of particulate contamination by the gravimetric method - defines a standardized gravimetric test to quantify particulate contamination in hydraulic fluids. The method measures the mass of suspended solids captured on a filter membrane after passing a defined fluid volume under vacuum. ISO 4405:2022 updates the original 1991 edition, streamlines calibration and equipment requirements, and specifies the reliable single‑membrane procedure for mineral‑oil based hydraulic fluids.

Key technical topics and requirements

Scope: Gravimetric determination of dirt content in mineral‑oil hydraulic fluids (categories HH, HL, HM, HV, HG per ISO 11158); suitable for concentrations ≥ 3 mg/L.

Principle: Filter a known volume of fluid through a single membrane; the mass increase of the membrane (after solvent rinsing, drying and conditioning) equals particulate contamination (mg/L).

Filter membrane: 47 mm diameter, 0.8 µm pore size (cellulose acetate / mixed ester examples cited).

Solvent: Petrol 40/65 (or 40/60/petroleum ether) filtered through 0.2 µm; hexane‑free recommended for safety; Annex A covers alternative solvents if qualified.

Equipment & conditions: vacuum filtration unit, analytical balance (±0.02 mg), non‑ventilated drying oven (≈80 °C used for conditioning), exsiccator, vacuum pump, and controlled room conditions (20–30 °C, 30–65% RH).

Procedures emphasized: membrane conditioning and weighing, blank test (blank ≤ 0.1 mg), sample handling and representative sampling (ISO 4021 referenced), rinsing and drying steps to ensure repeatability.

Quality notes: Double‑membrane method removed due to lower reliability; test repeatability and documentation procedures are specified.

Practical applications and who uses this standard

ISO 4405:2022 is used to ensure hydraulic system reliability and to control contamination that affects performance, wear and longevity. Typical users include:

Test laboratories performing hydraulic oil cleanliness analysis

OEMs and hydraulic system designers integrating contamination control criteria

Maintenance and reliability engineers for condition‑based maintenance programs

Oil suppliers and quality control departments verifying product cleanliness

Research institutions studying particulate contamination effects on hydraulic components

Practical uses include routine oil monitoring, failure investigation, filter performance evaluation, and comparative contamination reporting.

Related standards

ISO 4021 - Extraction of fluid samples from operating systems (sampling guidance used by ISO 4405)

ISO 11158 - Classification/specification of hydraulic oils (HH, HL, HM, HV, HG)

ISO 5598 - Fluid power vocabulary (terms and definitions)

Keywords: ISO 4405:2022, gravimetric method, particulate contamination, hydraulic fluid power, hydraulic oil cleanliness, filter membrane, contamination analysis.

ISO 4405:2022

Abstract

Похожие стандарты

Overview

Key technical topics and requirements

Practical applications and who uses this standard

Related standards

Технические детали

BS ISO 11158:2023

Lubricants, industrial oils and related products (class L). Family H (hydraulic systems). Specifications for…

ISO 4021:1992

Hydraulic fluid power — Particulate contamination analysis — Extraction of fluid samples from lines of an ope…

BS ISO 4405:2022

Hydraulic fluid power. Fluid contamination. Determination of particulate contamination by the gravimetric met…

ISO 5598:2008

Fluid power systems and components — Vocabulary