Air cleanliness is a kind of international classification standard used in clean room. Usually do clean room testing and acceptance based on empty, static and dynamic state. The continous stability of air cleanliness and polution control is the core standard of clean room quality. The classification standard can be divided into ISO 5(Class A/Class 100), ISO 6(Class B/Class 1000), ISO 7(Class C/Class 10000) and ISO 8(Class D/Class 100000).
