STANDARDS

ISO 5011 vs. SAE J726 Air Filter Test Standards

International vs. North American test codes for engine air intake filter element performance

ENGINEERING OBJECTIVE

Identify which air filter test standard applies to a filter element specification or performance claim, and understand what performance metrics each standard produces.

COMPARISON SCOPE

Covers ISO 5011:2020 and SAE J726 (current revision) for internal combustion engine air intake filter elements. Does not cover cabin air filter standards (ISO 11155, ISO 29463) or compressed air filter standards (ISO 8573).

GOVERNING STANDARDS

ISO 5011:2020SAE J726ISO 5125:2020

OPTION DEFINITIONS

AISO 5011:2020

The internationally harmonised test standard for air intake filter elements used in internal combustion engines, compressors, and similar applications. ISO 5011 specifies the test dust (ISO 12103-1 A2 fine test dust), test rig geometry, airflow conditions, and reporting requirements. Key outputs: initial restriction (kPa), final restriction at terminal ΔP, gravimetric efficiency (%), and dust holding capacity (g). Used globally by European OEMs and increasingly adopted for all international procurement.

ADVANTAGES

+Global harmonisation — single test protocol accepted by European, Asian, and South American OEM specifications

+ISO 12103-1 A2 fine test dust is precisely characterised with controlled particle size distribution — results are reproducible across test laboratories

+Dust holding capacity (DHC) in grams is the primary output for service interval calculations per ISO 3724

+Gravimetric efficiency (%) and collection efficiency at specific particle sizes are both measured — richer performance picture than SAE J726

+Active standard (ISO 5011:2020) — regularly updated to align with modern engine intake system geometries

LIMITATIONS

−A2 fine test dust is finer than some real-world dusts — results may not correlate directly with coarser field contaminants (mining, construction)

−Test laboratory setup requirements are more prescriptive — legacy test rigs calibrated for SAE J726 may require modification

−Older filter element data sheets may not carry ISO 5011 ratings — historical data comparison requires knowing which standard was used

TYPICAL APPLICATIONS

·European OEM (DAF, MAN, Mercedes-Benz, Volvo, Scania) engine air filter specifications

·Asian market specifications (Isuzu, Hino, Kubota)

·International procurement where single global standard is required

·Service interval engineering calculations per ISO 3724

BSAE J726

The Society of Automotive Engineers test code for air cleaner element performance, primarily used in North American engine and vehicle specifications. SAE J726 defines test procedures using AC coarse test dust (or equivalent), measuring restriction, efficiency, and capacity. Historically the dominant standard for North American OEM specifications (John Deere, Caterpillar, Cummins, Navistar). SAE J726 results are expressed as arrestance (%) for gravimetric efficiency and restriction (in. H₂O or kPa) for pressure drop.

ADVANTAGES

+Deeply embedded in North American OEM documentation — Caterpillar, John Deere, Cummins, and Navistar specifications reference SAE J726

+AC coarse test dust more closely matches coarser field contaminants in agricultural and construction environments than ISO A2 fine

+Long data history — extensive existing fleet data and comparison baselines exist using SAE J726 methodology

+Well understood by North American filter manufacturers and test laboratories

LIMITATIONS

−AC coarse test dust is not as precisely characterised as ISO 12103-1 A2 — batch-to-batch variation affects inter-laboratory reproducibility

−Arrestance (%) is less precise than ISO 5011 collection efficiency at specific particle sizes for engineering design

−Not aligned with international harmonisation — creates dual-spec burden for global OEMs and suppliers

−SAE J726 dust holding capacity values are not directly comparable to ISO 5011 DHC — different test dust and conditions

TYPICAL APPLICATIONS

·North American agricultural OEM specifications (John Deere, AGCO, CNH)

·North American construction equipment (Caterpillar, Komatsu NA, Terex)

·Cummins and other North American engine builder specifications

·Retrofit and aftermarket filter selection where original OEM tested to SAE J726

ENGINEERING COMPARISON MATRIX

DIMENSION	A — ISO 5011:2020	B — SAE J726
Test dust	ISO 12103-1 A2 fine (precisely characterised)	AC fine/coarse (variable batch-to-batch)
Efficiency metric	Gravimetric efficiency % + particle size efficiency	Arrestance % (gravimetric only)
Capacity metric	DHC in grams — ISO 3724 service interval input	Dust capacity in grams (not directly ISO 3724 compatible)
Restriction metric	kPa at stated flow rate	in. H₂O or kPa — dual unit legacy
Geographic adoption	Europe, Asia, international procurement	North America — OEM legacy specifications
Harmonisation status	Active ISO standard (2020 revision)	SAE document — no formal ISO alignment
Reproducibility	High — A2 dust tightly specified	Moderate — AC dust particle size varies by lot

WHEN TO USE A

ISO 5011:2020

✓All new international filter element specifications

✓Service interval engineering calculations requiring ISO 3724 DHC inputs

✓European or Asian OEM compliance

✓When inter-laboratory reproducibility is critical for global procurement

WHEN NOT TO USE

✗When the OEM explicitly requires SAE J726 data for warranty compliance and no ISO 5011 correlation data exists

WHEN TO USE B

SAE J726

✓North American OEM specifications (Caterpillar, John Deere, Cummins) that explicitly require SAE J726 test data

✓Matching replacement filter performance against existing SAE J726 baseline data for North American equipment fleet

✓Retrofit decisions for legacy North American equipment where OEM specifies SAE J726 DHC thresholds

WHEN NOT TO USE

✗New equipment specifications or international procurement

✗ISO 3724 service interval engineering — SAE J726 DHC is not a direct ISO 3724 input

✗Any context requiring inter-laboratory reproducibility across EU/US/Asia test houses

ENGINEERING IMPLICATIONS

01ISO 5011 DHC values and SAE J726 dust capacity values are not directly interchangeable for ISO 3724 service interval calculations — always establish which test standard was used.

02When specifying filter performance for international supply chains, ISO 5011 is the required reference — SAE J726 creates parallel testing burden without global recognition.

03Efficiency values from ISO 5011 (using A2 fine dust) will typically appear lower than SAE J726 arrestance (using AC coarse dust) for the same filter element — the finer test dust penetrates more easily.

04For North American replacement decisions, verify which test standard the original OEM used before comparing replacement filter DHC or efficiency ratings.

RELATED KNOWLEDGE

STANDARDS

ISO 5011 →SAE J726 →ISO 3724 →

TECHNOLOGIES

MACROCORE →

ARTICLES

dust holding capacity →service intervals →testing and validation →

ISO 5011 vs. SAE J726 Air Filter Test Standards

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