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Clean room standard clean room dust-free workshop grade division
A cleanroom is a controlled environment designed to minimize the presence of airborne particles, contaminants, and other pollutants. These rooms are categorized into different cleanliness levels based on the number and size of particles allowed per cubic foot of air. The lower the number, the cleaner the environment. For example, a Class 100 cleanroom is significantly cleaner than a Class 1000 room.
In the semiconductor and panel manufacturing industries, cleanrooms typically operate at Class 1000 or Class 100. These standards ensure that the production environment remains free from contamination that could affect product quality. The classification system is based on the maximum number of particles of specific sizes allowed in a given volume of air.
According to the U.S. Federal Standard 209E (1992), cleanrooms are divided into six classes: 1, 10, 100, 1000, 10,000, and 100,000. Each class specifies the maximum number of particles of various sizes that can be present in one cubic foot of air. For instance, a Class 100 cleanroom allows no more than 100 particles of 0.5 micrometers or larger per cubic foot. However, it's important to note that particle size varies by class, and the standard often includes specific particle sizes for accurate classification.
For example, a Class 10 cleanroom may allow up to 75 particles of 0.5 micrometers or larger per cubic foot, while a Class 100 cleanroom might allow up to 300 such particles. In integrated circuit manufacturing, where precision is critical, the cleanroom must meet or exceed a Class 1000 standard to prevent any contamination that could damage sensitive components.
In addition to the U.S. Federal Standard, other systems like the Japanese Industrial Standard (JIS) also define cleanroom classifications. Under JIS, cleanrooms are divided into eight levels, with each level specifying the number of particles of 0.1 micrometers or larger in a cubic meter of air. This helps ensure consistency and clarity across different industries and regions.
It’s also worth noting that cleanroom standards are not just about dust particles. They also account for biological contaminants, such as bacteria or fungi, which are particularly important in medical or pharmaceutical settings. In these cases, additional specifications like the NASA Biological Contamination Requirement (BCR) may apply to control microbial growth.
Overall, understanding cleanroom classifications is essential for maintaining high-quality standards in industries such as electronics, biotechnology, and aerospace. Whether following the U.S. Federal Standard, JIS, or another system, the goal remains the same: to create an environment that supports precise and reliable manufacturing processes.