Industrial Filtration Standards

ISO 16889

2022 (3rd edition)

Hydraulic Fluid Power

Laboratory evaluation of hydraulic fluid-power filter elements under the test conditions and applicability limits defined by ISO 16889:2022.

ISO 4406

2021 (4th edition; confirmed 2026)

Hydraulic Fluid Power

Coding the level of solid-particle contamination in fluid used in hydraulic fluid-power systems.

ISO 11171

2016

Hydraulic Fluid Power

Automatic particle counters (APC) used for particle counting in hydraulic and lubrication fluids.

ISO 5011

2014

Inlet Air Cleaning Equipment

Air filters for internal combustion engines, gas turbines, and compressors.

ISO 29463

2011 (Parts 1–5)

High-Efficiency Filters and Filter Media

High-efficiency air and cabin air filters for HEPA/ULPA performance classification.

ISO 11155-1

2001

Road Vehicles

Performance testing of cabin air filter elements for particle filtration efficiency (PM10, PM2.5) and airflow resistance in road vehicle passenger compartments and heavy equipment operator cabs.

ISO 12937

2000

Petroleum Products

Determination of water content in petroleum products with water content between 5 mg/kg and 2,000 mg/kg using coulometric Karl Fischer titration.

ISO 16332

2018 (1st edition; confirmed 2023)

Diesel Engines

Comparative laboratory evaluation of diesel fuel/water separator efficiency for pressure-side and suction-side separator configurations.

ISO 8573-1

2010

Compressed Air

Classification of compressed air purity by contamination class for solid particles, water (liquid and vapor), and total oil (liquid, aerosol, and vapor).

ISO 3723

2015 (2nd edition; confirmed 2026)

Hydraulic Fluid Power Filter Elements

Verification of hydraulic filter-element end-load rating and resistance to designated axial loading from installation and use.

ISO 19438

2003

Diesel Fuel and Petrol

Fuel filter elements in diesel and petrol fuel systems, particularly high-pressure common-rail injection systems requiring particle filtration qualification at ≤6 µm particle sizes.

ISO 8573-2

2018 (3rd edition)

Compressed Air

Measurement of oil aerosol and vapour contamination in compressed air at the point of use, for compressed air treatment system qualification and purity class verification per ISO 8573-1.

ISO 3968

2001

Hydraulic Fluid Power

Hydraulic filter elements and filter assemblies requiring pressure-flow characteristic data for system integration into hydraulic circuit design.

ISO 2941

2009 (2nd edition; confirmed 2025)

Hydraulic Fluid Power

Verification of hydraulic filter-element capability to withstand a designated differential pressure in the intended direction of flow.

ASTM D6304

2007

Standard Test Method for Determination of Water in Petroleum Products by Coulometric Karl Fischer Titration

Water content determination in petroleum products, lubricating oils, and additives with water content from 10 ppm to 25,000 ppm using coulometric Karl Fischer titration.

ASTM D5185

2019

Determination of Additive Elements, Wear Metals, and Contaminants in Used Lubricating Oils by ICP-OES

Used lubricating oils, hydraulic fluids, and related petroleum products in predictive maintenance oil analysis programmes requiring elemental quantification of wear metals, additive elements, and contaminants.

SAE J726

2002 (canceled)

Air Cleaner Test Code

Historical laboratory test code for determining and reporting dry-type and oil-bath internal-combustion-engine air-cleaner performance.

SAE J1539

1986

Air Cleaner Test Code

Test code for air cleaner performance evaluation on heavy-duty diesel engines, including restriction measurement, filtration efficiency, and service life determination.

SAE J1858

2011

Full-Flow Lubricating Oil Filters

Full-flow lube oil filters for internal combustion engines.

NAS 1638

1964 (with subsequent amendments)

Cleanliness Requirements for Parts Used in Hydraulic Systems

Hydraulic system components and fluids in aerospace, defense, and industrial applications.

DIN 51524

Active (multi-part)

Hydraulic Fluids

Hydraulic and lube oil performance classification for industrial and mobile equipment — engine lube circuits, hydraulic power circuits, and industrial gear lubrication.

DIN 71460

Active (pre-harmonisation)

Road Vehicles

Cabin air filters for road vehicles (passenger cars, light commercial vehicles, buses, trucks) in European OEM qualification contexts, particularly German automotive supply chains.