|
Measurement Testing
A Resource Dedicated to Environmental Testing, EMC Testing, Vibration Testing and related areas
|
|
|
| Author |
Message |
Mjr
Site Admin
Joined: 13 Jul 2005
Posts: 294
|
 Posted: Wed Mar 26, 2008 9:59 pm Post subject: What is a "clean room" |
 |
|
What is a Cleanroom?
A cleanroom is an enclosed (isolated) work area which incorporates high standards of control -- humidity, temperature and filtration so that all forms of particulate matter and contamination are minimized .
The level of cleanliness required in a cleanroom facility depends on the type of work performed in the room. Cleanroom cleanliness levels is the amount of contamination present in the atmosphere when all persons (i.e. lab tech, workers) are absent in the room.
Cleanrooms classification: This is based on the amount and size of particulate contamination present in the work area. Air cleanliness classes are determined by Federal Standard no. 209E. Very briefly, they are.
Class 10: particle count not to exceed a total of 10 particles per cu. ft. of a size 0.5 microns and larger, and zero particles of 5.0 microns and larger.
Class 100: particle count not to exceed a total of 100 particles per cu. ft. of a size 0.5 microns and larger, and zero particles of 5.0 microns and larger.
Class 1000: particle count not to exceed a total of 1000 particles per cu. ft. of a size 0.5 microns and larger, or 6.5 particles per cu. ft. of a size 5.0 microns and larger.
Class 10,000: particle count not to exceed a total of 10,000 particles per cu. ft. of a size 0.5 microns and larger, or 65 particles per cu. ft. of a size 5.0 microns and larger.
Class 100,000: particle count not to exceed a total of 100,000 particles per cu. ft. of a size 0.5 microns and larger, or 700 particles per cu. ft. of a size 5.0 microns and larger.
USP 797 and beyond: Cleanroom operators are always striving to provide cleaner work areas. Some manufacturers are moving towards class 10 and Class 1 cleanrooms (or clean work stations), which will pretty much prohibit the use of current work methods. These cleanrooms may even require using robots to perform super-clean work.
Cleanrooms might be built using myriad air-flow designs in order to maximize particulate control. Clean-rooms are normally designed to provide vertical or horizontal flow of filtered air in the work space. |
|
| Back to top |
|
 |
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
|
Powered by phpBB © 2001, 2005 phpBB Group
|
