When it comes to testing HEPA and ULPA filters, two major standards are widely used:
EN 1822 and ISO 29463.
Although they are closely related, there are important differences in their structure, application, and global usage.
This guide explains the key differences to help you understand which standard to use—and why it matters.
1. Overview of EN 1822 and ISO 29463
EN 1822
- European standard
- Focused on HEPA/ULPA filter testing
- Widely used in Europe and many international projects
ISO 29463
- International standard (based on EN 1822)
- Developed to harmonize global testing methods
- Increasingly adopted worldwide
👉 In simple terms:
ISO 29463 = international version of EN 1822 (with some extensions)
2. Structural Differences
EN 1822 Structure
EN 1822 is typically divided into 5 parts:
- Classification, performance testing
- Aerosol production and measurement
- Flat sheet media testing
- Leak test (scan test)
- Filter element testing
ISO 29463 Structure
ISO 29463 expands this into multiple parts with more detailed guidance, including:
- Additional definitions
- Extended testing procedures
- Global harmonization
👉 ISO 29463 is more comprehensive and standardized internationally
3. Classification System
Both standards classify filters based on efficiency at MPPS:
| Class Type | EN 1822 | ISO 29463 |
|---|---|---|
| HEPA | H13–H14 | Same |
| ULPA | U15–U17 | Same |
👉 Classification values are essentially aligned
4. Testing Method Comparison
Similarities
Both standards include:
✔ MPPS determination
✔ Efficiency testing
✔ Leak (scan) testing
Differences
| Aspect | EN 1822 | ISO 29463 |
|---|---|---|
| Scope | Europe-focused | Global |
| Detail level | Moderate | More detailed |
| Standardization | Regional | International |
👉 In practice:
Test principles are the same, but ISO 29463 is more standardized globally
5. Leak Test (Scan Test): No Real Difference
The most critical test in both standards is the scan test.
- Detects local leaks in filters
- Ensures uniform performance
- Required for HEPA/ULPA validation
👉 Equipment requirements are essentially the same for both standards
6. Which Standard Should You Use?
Choose EN 1822 if:
- Your market is Europe
- Your clients specify EN standards
- You work with established HEPA production lines
Choose ISO 29463 if:
- You sell globally
- You need international compliance
- Your clients require ISO certification
👉 Many manufacturers now test according to both standards
7. Practical Challenges in Testing
Regardless of the standard, common challenges include:
- Detecting micro-leaks
- Maintaining stable aerosol concentration
- Achieving consistent scanning speed
- Avoiding false positives
👉 These challenges directly impact test accuracy
8. Recommended Testing Solution
To meet both EN 1822 and ISO 29463 requirements, a reliable scanning system is essential.
The SC-L8023 Scanning Filter Tester from SCPUR is designed for:
- High-sensitivity leak detection
- Precise scanning control
- Stable and repeatable performance
👉 Suitable for both EN 1822 and ISO 29463 testing
9. Conclusion
EN 1822 and ISO 29463 are closely related standards for HEPA and ULPA filter testing.
- EN 1822 → widely used in Europe
- ISO 29463 → global standard based on EN 1822
👉 In most cases, the testing methods are similar, and the choice depends on your market requirements.
