The PO says "must comply with EN 1822 H14." The Japanese supplier replies, "Our report follows ISO 29463 testing." Does that count?
ISO 29463 = The International Edition of EN 1822
In one sentence: ISO 29463 is the result of elevating EN 1822 from a European standard to an international standard. The technical core is almost identical — grade codes (E10–U17), MPPS testing concept, three-stage test flow — all the same logic.
Why publish a separate ISO version? Because EN is a "European Standard," legally binding only in CEN member states. Non-CEN countries (USA, Japan, China, Taiwan) widely reference EN 1822 in practice, but formally citing another region's standard in national regulations is awkward. ISO 29463 solves this — published by ISO (International Organization for Standardization), it can be directly referenced by any country.
Readers not yet familiar with the EN 1822 grading system should read that article first for context.
Item-by-Item Comparison
ISO 29463 vs EN 1822: Side-by-Side
ISO 29463 is essentially the "international rewrite" of EN 1822 — same technical core, with minor tightening or relaxing on a few details
| Item | EN 1822 | ISO 29463 | Difference |
|---|---|---|---|
| Grade names | E10–E12, H13–H14, U15–U17 | Identical | None |
| Efficiency thresholds | H13 ≥ 99.95%, H14 ≥ 99.995%… | Identical | None |
| Test aerosol | DOP or PAO | PAO preferred (DOP de-emphasized due to carcinogenicity) | Practical: none (industry already switched to PAO) |
| Scan speed | No explicit upper limit | Explicit scan speed upper limit defined | ISO stricter — prevents "scanning too fast to catch" |
| Local efficiency threshold | H14 and above | Identical | None |
| Geographic scope | Europe (CEN member states) | Global (ISO member countries) | ISO is globally accepted — no conversion needed for cross-border procurement |
| Relationship to national standards | EU nations adopt directly (e.g. DIN EN 1822) | Japan JIS B 9927, China GB/T, Taiwan CNS align to it | Non-European countries align with Europe through ISO 29463 |
ISO 29463 has 5 Parts (classification, aerosol generation, media test, leak detection, overall efficiency). EN 1822 also has 5 Parts with similar scope but different numbering. Technical differences are minimal; ISO primarily unified previously scattered national approaches.
Key differences:
| Comparison Item | EN 1822 | ISO 29463 |
|---|---|---|
| Publisher | CEN (Europe) | ISO (International) |
| Grade codes | E10–U17, identical | E10–U17, identical |
| MPPS concept | Yes | Yes, same logic |
| Scan test | Required from H13 | Required from H13 |
| Document structure | Single document | Split into 5 Parts |
| Aerosol generator spec | Somewhat general | More detailed calibration requirements |
| Particle counter spec | Somewhat general | Adds OPC accuracy requirements |
The biggest difference is not "what you test" but "how you make sure the test is accurate" — ISO 29463 goes into greater detail on lab instrument calibration, aerosol generator stability, and sampling-line loss compensation.
Plain English: If EN 1822 is the exam syllabus, ISO 29463 is the syllabus + proctoring rules + anti-cheating measures. The exam content is the same; the exam-room requirements are stricter.
Global Adoption Status
Global HEPA/ULPA Standards Map
EN 1822 is the European standard, ISO 29463 is the international one — most national standards align to one or both
| Country / Region | National standard | Aligns to |
|---|---|---|
| EU / CEN Member States | EN 1822 | ISO 29463 |
| Germany | DIN EN 1822 | EN 1822 = ISO 29463 |
| Japan | JIS B 9927 | ISO 29463 |
| China | GB/T 13554 | ISO 29463 |
| Taiwan | CNS | ISO 29463 |
| South Korea | KS | ISO 29463 |
| United States | IEST-RP-CC001 | — (獨立體系) |
The US remains the only major market where IEST (Institute of Environmental Sciences and Technology) is still widely used, but multinationals and semiconductor fabs have largely converged on EN 1822 / ISO 29463. Taiwan CNS currently aligns with ISO 29463.
The reality: most countries are transitioning from EN 1822 to ISO 29463, but the transition is slow.
- ▸EU: CEN has transposed ISO 29463 as EN ISO 29463, but EN 1822-certified filters still dominate the market
- ▸Japan: JIS has published the corresponding JIS B 9927, technically aligned with ISO 29463, but the Japanese market prefers JIS reports
- ▸China: GB/T has adopted ISO 29463 as the national standard; new fab specifications are referencing it
- ▸USA: IEST remains market convention, but ISO 29463 appears increasingly in multinational companies' global specs
- ▸Taiwan: CNS has not fully transposed it yet, but major semiconductor manufacturers already reference ISO 29463 internally
Why IEST Persists in the US
The US market is a special case. IEST-RP-CC001 (Recommended Practice for HEPA and ULPA Filters) has been entrenched in North America for decades. The entire supply chain — from filter manufacturers to test labs to end users — is built around IEST.
The biggest differences between IEST and EN 1822 / ISO 29463:
| Item | IEST | EN 1822 / ISO 29463 |
|---|---|---|
| Challenge particle size | Fixed 0.3 μm | MPPS (varies by media) |
| Challenge aerosol | DOP or PAO | DEHS or equivalent |
| Grade classification | Type A / B / C / D / E / F | E10–U17 |
| Scan speed spec | More lenient | More stringent |
In practice, many multinational semiconductor fabs require both "EN 1822 / ISO 29463 report" and "IEST report" — Asia-Europe sites use the former, US sites use the latter. Filter manufacturers typically issue dual reports.
How to Handle Cross-Border Procurement
If you are the buyer, facing two reports for the same filter, how do you decide?
Scenario 1: Report is EN 1822 only → Technically equivalent to ISO 29463; acceptable. But if your company spec has upgraded to ISO 29463, ask the supplier to supplement with an ISO report (the difference is mainly in instrument calibration records).
Scenario 2: Report is ISO 29463 only → Grade codes and test methods match EN 1822; use directly. If challenged with "this is not EN 1822," present the ISO 29463 / EN 1822 equivalence table.
Scenario 3: Report is IEST (Type C ≈ H13 equivalent) → Grades can be mapped, but the test method differs (fixed 0.3 μm vs MPPS). If your spec says EN 1822 / ISO 29463, strictly speaking you cannot substitute directly — the supplier needs to supplement with an MPPS test.
Recommendation: Write new procurement specs referencing ISO 29463, with a note "or equivalent EN 1822 / EN ISO 29463." This lets global suppliers align without debating which label counts.
For how ISO 14644 cleanroom classification maps to filter grades, cross-reference that article.
FAQ
Q: Can my EN 1822 certification be used in Japan?
A: Technically yes, since EN 1822 and ISO 29463 share grades and test methods. But Japanese customers may require a JIS B 9927 report as well, especially if their procurement spec names JIS. In practice, attaching an EN 1822 report with a grade-equivalence note is usually accepted.
Q: Is the DOP test method really obsolete?
A: DOP (dioctyl phthalate) has been replaced by DEHS (diethylhexyl sebacate) or PAO (poly-alpha-olefin) due to health concerns (potential endocrine disruptor). Neither EN 1822 nor ISO 29463 specifies DOP as the standard aerosol. IEST still lists DOP/PAO as options. If a legacy spec says "DOP test," recommend updating to "DEHS or PAO test."
Q: Is ISO 29463 stricter or more lenient than EN 1822?
A: Efficiency thresholds are identical (H13 = 99.95%, H14 = 99.995%, etc.), so neither is "stricter" on pass/fail. Where ISO 29463 is more demanding is test procedure quality control — instrument calibration, aerosol stability, and sampling-loss requirements are more detailed.
Q: Which standard should a semiconductor fab use?
A: Depends on where your fab and customers are. For globally distributed companies, unify on ISO 29463 as the master spec, then attach local-standard equivalence tables for each site (EN 1822 for Europe, JIS for Japan, IEST for USA). One filter spec covers the world.
Q: What is the relationship between CNS (Taiwan national standard) and these two?
A: CNS has not fully transposed ISO 29463 yet. The Taiwan market still primarily references EN 1822, but major semiconductor fabs are progressively switching to ISO 29463 in procurement specs. Suppliers should prepare both EN 1822 and ISO 29463 reports for maximum coverage.
