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Frequently Asked Questions
 

NAS1638 Contamination classes:

 
ISO 4406 Contamination classes:( particles in per ml)
ISO4406£¨1991£©based ACFTD dust, ISO4406£¨1999£© based MTD dust:
 
GJB420A-96 Contamination classes (particles in per 100ml, based ACFTD dust)£º
 
ISO 209E Contamination classes for air£º
 
Compare between ACFTD Dust and ISO-MTD Dust£º
 

Note: ISO 4406£¨1991£©displayed according to >2/>5/>15um, based ACFTD dust
ISO 4406£¨1999£©displayed according to >4/>6/>14um, based MTD dust

 

 
 
 
 
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