Iso 146443pdf 2021 【2026 Edition】

The standard provides a comprehensive set of test methods to characterize the performance of cleanrooms and clean zones. It ensures they meet specific air cleanliness classifications and other controlled conditions. Key Content and Test Methods

The standard specifies procedures for two types of environments—unidirectional flow and non-unidirectional flow—across three occupancy states: as-built, at-rest, and operational. Major test categories include:

Airborne Particle Measurement: Methods for designating the classification of airborne particulate cleanliness.

Air Filter Testing: Validation of filter systems, specifically focusing on HEPA filter integrity to ensure they effectively remove airborne contaminants. iso 146443pdf 2021

Airflow and Physical States: Measuring parameters like airflow volume, velocity, and pressure differences between zones.

Secondary Attributes: Procedures for electrostatic measurement and other environmental conditions like humidity or temperature. Standard Context

Relationship to Other Standards: It is often used in conjunction with ISO 14644-1, which focuses on the actual classification of air cleanliness by particle concentration. The standard provides a comprehensive set of test

Safety Notice: The document specifies that users are responsible for establishing their own safety and health practices when following these test methods.

For official access, the standard can be purchased or viewed through authorized distributors like Accuris Standards Store or Intertek Inform. ISO 14644-3

Scope

This part of the ISO 14644 series covers the following: Scope This part of the ISO 14644 series

• Test methods for airborne particulate contamination
• Methods for determining the concentration of airborne particles
• Evaluation of the performance of cleanrooms and controlled environments

4. Main Test Methods (Detailed)

4.5 Airflow Visualization (Smoke Studies)

• Purpose: Demonstrate unidirectional flow direction, turbulence, or containment.
• Tools: Smoke generators (DI water, glycol, or mineral oil) + video recording.
• New in 2019: Quantitative turbulence intensity measurement.

Key Aspects of ISO 14644-1:2021

• General Principles: This part of the standard outlines the basic principles for cleanroom design, operation, and monitoring. It provides a framework for achieving and maintaining controlled environments.

• Contamination Control: The standard emphasizes the control of airborne particulate contamination, which is critical in cleanroom operations. It introduces the concept of cleanroom classification based on the concentration of airborne particles.

• Cleanroom Classification: ISO 14644-1 defines cleanroom classes (e.g., ISO 1 to ISO 6), with ISO 1 being the cleanest. The classification is based on the number of particles ≥0.1 µm, ≥0.2 µm, ≥0.3 µm, ≥0.5 µm, ≥1 µm, and ≥5.0 µm per cubic meter of air.

• Application: The standard is applicable to all types of cleanrooms and controlled environments, offering guidance on design, operation, and monitoring to ensure specified conditions are met.