There are three division standards for cleanliness, a GMP pharmaceutical industry four levels (dedicated to the pharmaceutical industry), a U.S. federal 209E standard (abolished, but China has been accustomed to use), and an international ISO14644 standard (the latest international popularity of the standard).
1, the four levels of cleanliness ABCD this statement is mainly used in the pharmaceutical industry. ABCD grading standards from the World Health Organization (WHO) promulgated the GMP, is the pharmaceutical industry's prevailing pharmaceutical production quality management norms. 2011, China's new version of the GMP (Good Manufacturing Practices) to implement, the pharmaceutical industry began to use the WHO grading standard, with the ABCD to distinguish the level of clean area.
Four levels of GMP
2, the U.S. federal 209E standard. China's other industries in the clean room (clean room), is still accustomed to the U.S. grading standards, that is, the U.S. Federal 209E standard, we often hear of ten, hundred, thousand, ten thousand, one hundred thousand, three hundred thousand, and so on, is divided according to this standard. This grading standard is not limited to four grades. 2001 the United States has ceased to use the 209E standard, but we are still accustomed to follow this statement.
U.S. 209E and the international ISO standard comparison
Third, there is now a common standard, is the international ISO14644 standard, which is commonly used in nine grades, the same applies to a number of industries in the clean room (clean room).
The three clean room (clean room) class standards can be benchmarked. International ISO14644 class5 is equivalent to class A, class B (hundred), class7 is equivalent to class C (ten thousand), class8 is equivalent to class D (hundred thousand).