標準號：ISO 14644-1-1999
中文標準名稱：潔凈室和相關控制環境 第1部分:空氣潔凈度分級
英文標準名稱：Cleanrooms and associated controlled environments - Part 1: Classification of air cleanliness
標準類型：C04
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：C04
國際標準分類號：13.040.35
適用范圍：This part of ISO 14644 covers the classification of air cleanli-ness in cleanrooms and associated controlled environments exclusively in terms of concentration of airborne particles. Only particle populations having cumulative distributions based on threshold (lower limit) sizes ranging from 0,1 μm to 5 μm are considered for classification purposes. This part of ISO 14644 does not provide for classification of particle populations that are outside of the specified particle size range, 0,1 μm to 5 μm. Concentrations of ultrafine particles (particles smaller than 0,1 μm) and macroparticles (particles larger than 5 μm) may be used to quantify these populations in terms of U descriptors and M descriptors, respectively. This part of ISO 14644 cannot be used to characterize the physical, chemical, radiological, or viable nature of airborne particles. NOTE The actual distribution of particle concentrations within incre-mental size ranges normally is not predictable and typically is variable over time.