puhtaistiloissa

Puhtaistiloissa, often translated as cleanrooms, are specially constructed environments designed to minimize or eliminate airborne contaminants like dust, microbes, and other particulates. The level of cleanliness is strictly controlled to a specified number of particles per cubic meter at a specified particle size. These environments are crucial in industries where product integrity is paramount, such as semiconductor manufacturing, pharmaceuticals, biotechnology, and aerospace.

The design of a puhtaustila incorporates specific features to maintain its controlled atmosphere. This includes high-efficiency particulate air (HEPA) or ultra-low particulate air (ULPA) filters that continuously circulate and clean the air. Air pressure is typically maintained at a higher level than the surrounding areas to prevent the ingress of unfiltered air. Materials used in construction are chosen for their low particle emission properties, and surfaces are smooth and easy to clean.

Personnel entering a puhtaustila undergo a rigorous gowning procedure. This involves wearing specialized garments like lab coats, hoods, masks, gloves, and shoe covers to prevent shedding of skin cells, hair, and other particles from their bodies. Air showers are often used to remove any loose particles from individuals and their clothing before they enter the main cleanroom area.

Monitoring is a continuous process in puhtaistiloissa. Particle counters are used to regularly measure the concentration of airborne particles, while environmental sensors track temperature, humidity, and air pressure. These parameters are critical for ensuring that the cleanroom's integrity is maintained and that the required standards are met. The classification of a puhtaustila, such as ISO Class 1 to 9, indicates the maximum allowable number of particles per cubic meter.