BS EN ISO 14644-1-1999 洁净室和相关的控制环境.空气清洁度的分级

标准号：BS EN ISO 14644-1-1999
中文标准名称：洁净室和相关的控制环境.空气清洁度的分级
英文标准名称：Cleanrooms and associated controlled environments - Classification of air cleanliness
标准类型：N04
发布日期：1999/8/15 12:00:00
实施日期：1999/8/15 12:00:00
中国标准分类号：N04
国际标准分类号：13.040.35
适用范围：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 largerthan 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.