What is ISO 8 cleanroom classification?

Each cleanroom class is denoted by a maximum concentration of particles per cubic meter or cubic foot of air. ISO 8 is the second lowest cleanroom classification

An ISO 14644-1 classified cleanroom is a room or contained environment where it is crucial to keep particle counts low. Typically, these particles are dust, airborne microbes, aerosol particles, and chemical vapors. Beyond particle counts, cleanrooms often have controls for a number of other parameters like pressure, temperature, and humidity. Additionally, to be considered a cleanroom, the space needs High-Efficiency Particulate Air (HEPA) filters to remove particles from the air.

ISO 14644-1 Cleanrooms are classified from ISO 1 to ISO 9. Each cleanroom class is denoted by a maximum concentration of particles per cubic meter or cubic foot of air. ISO 8 is the second lowest cleanroom classification.

ISO 8 Cleanroom Standards

The allowed particle counts for an ISO 8 cleanroom depend on the referenced standard and its measurements. According to US Federal Standard 209E, ISO 8 cleanrooms are also known as Class 100,000 cleanrooms.


What is ISO 8 cleanroom classification?

2017-08-10 ISO Cleanroom Standards

ISO 14644-1 replaced the federal standard and states that an ISO 8 cleanroom needs less than 3,520,000 of ≥ 0.5 micron sized particles per cubic meter of air. Only particles 0.5 microns or larger are measured in an ISO 8 cleanroom. This is done because the concentration of smaller particle sizes is too high.

ISO 8 Protective Requirements and Design Considerations

Designing a cleanroom requires taking additional regulatory standards and requirements into account based on industry and application. However, there are several general requirements and environmental parameters to consider for an ISO 8 cleanroom. For an ISO 8 Cleanroom, these include:

  • HEPA filtration
  • Air Changes per Hour (ACH)
  • Air pressure
  • Temperature and humidity
  • Amount of personnel working in the space
  • Static control
  • Lighting
  • Noise levels

Since an ISO 8 cleanroom is focused on measuring particles 0.5 microns or larger, the HEPA filtration system needs to be 99.97% efficient and a minimum of 20 air changes per hour is recommended. The final filtration of air occurs where the air enters the cleanroom. Additionally, it is most common for ISO 8 cleanrooms to employ non-unidirectional or mixed air flow patterns with low wall air returns. Common ISO 8 Applications A wide variety of industries and applications have cleanrooms. Some of the most common with ISO 8 cleanrooms include:

Frequently Asked Questions on ISO 8
What is the difference between ISO 7 and ISO 8?

The two main differences between ISO 7 and ISO 8 cleanrooms are particle count and ACH requirements, which set them apart for differing applications. An ISO 7 cleanroom must have 352,000 particles ≥ 0.5 microns per cubic meter and 60 ACH per hour as opposed to ISO 8’s 3,520,000 particles and 20 ACH.

When is a cleanroom required?

A cleanroom can be used for a number of industries and applications. They are required for spaces where cleanliness and sterility are crucial. For context, an ISO 8 cleanroom is usually 5-10 times cleaner than a typical office environment. Specifically, in medical device and pharmaceutical manufacturing cleanrooms, the safety and quality of products is of the utmost importance, and raw materials, manufacturing processes, and finished product and can be affected if too many particles enter the space.