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Class a laminar flow hood and class 100 laminar flow hood cleanliness grade division standard
Class a laminar flow hood and class 100 laminar flow hood cleanliness grade division standardCleanliness level is an indicator to measure the cleanliness of the air in a space, mainly based on the concentration of suspended particles in the air to divide. At present, the international standard is widely used ISO 14644-1, and the domestic standard is also in line with it. The standard divides cleanliness from ISO Level 1 to ISO Level 9, the smaller the number, the higher the cleanliness.ISO Grades 1-4: These grades have very high cleanliness levels, and the number of particles ≥0.1μm per cubic meter of air is limited to 10, 100, 1000, and 10,000, respectively. Such cleanliness is commonly used in ultra-precision electronic manufacturing, such as the lithography process in semiconductor chip manufacturing, which requires a very clean environment to ensure that the tiny circuit of the chip is not polluted by dust particles, ensuring chip performance and yield. ISO Level 5: that is, we often say that the cleanliness of 100 levels, the number of particles ≥0.5μm per cubic meter of air does not exceed 10,000. It is suitable for scenes with high cleanliness requirements, such as the production of ordinary electronic components and non-critical processes in general biopharmaceuticals, and can effectively prevent pollutants such as dust from affecting products or experiments. ISO grades 6-9: As the number increases, the cleanliness gradually decreases. ISO 6 is a thousand levels of cleanliness, ISO 7 is 10,000, ISO 8 is 100,000, and ISO 9 is 300,000. These grades are often used in food processing, cosmetic production, general laboratories, etc., to meet basic hygiene and cleanliness requirements, and to avoid excessive dust particles on product quality or experimental results interference. In addition to ISO standards, in the pharmaceutical industry, there are cGMP (current drug production quality management practice) of the US FDA and GMP standards of the EU have detailed regulations on cleanliness, of which level A corresponds to about ISO level 4.8, which is the highest level of cleanliness, for the key production processes of sterile drugs, such as sterile drug filling; Grade B, grade C, and grade D cleanliness are reduced successively and are respectively suitable for different pharmaceutical links. |
