Understanding ISO 21501-4 (LS)

Cleanrooms that manufacture products adopt procedures to improve yield and increase throughput. Consequently, many manufacturers follow ISO 14644-1 for determining particle counts and classifying cleanrooms (based upon airborne particle data) and ISO 14644-2 for instrumentation guidelines that demonstrate continued compliance.

The newly released ISO 14644-1:2015 introduces the need for particle counters calibrate to ISO 21501-4. The calibration methods assure data accuracy and repeatability.

The methods outlined in ISO 14644 and ISO 21501-4 represent an important step to more accurate evaluations of clean room contamination and improved process control.

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