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What are the different classifications of cleanrooms like Class 100, Class 1000, Class 10,000, and Class 100,000?

Apr 29,2025 | Wiskind Cleanroom FAQs

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Cleanrooms are categorized based on the maximum number of particles (0.5 micrometer in size) allowed per cubic foot of air. For instance, a Class 100 cleanroom allows only 100 particles per cubic foot. These classifications, originally from the Federal Standard 209, are still widely used, despite being replaced by ISO-14644-1 in 2001. For example, Class 100 corresponds to ISO 5, and Class 100,000 aligns with ISO 8.

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