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NO breakthrough Troublshooting, Ruled out: only see it in ~5% of…

- - - - activated carbon contamination
- - - - electrostatic issues
        
        don't de-stat cartridge
        
        Stat gun too much
      - humidity at MFG
        
        Review records for similarly low RH
    - - not enough KMnO4@SiO2
      - not packed level
        
        remove end-cap and frit. MIGHT disturb powder
    - - different per operator?
        
        Make lots of cartridges and test
      - different per day?
  - - - O-ring
        
        o-ring groove
        
        defect
        
        out of spec
        
        edge of spec
        
        Inspect dimensions and visual defect (with loop)
        
        o-ring dimensions
        
        o-ring hardness
        
        Test hardness. Need equipment
        
        o-ring defect
        
        test NO breakthrough, replace o-ring, re-test
        
        Manufacturer
        
        replace o-ring of fails with different supplier
        
        MFG cols with different supplier o-ring
      - central bore hole
        
        frit dimension
        
        hole ID. too wide = bad fit
      - cartridge body
        
        body OD
        
        too narrow = bad seal
        
        o-ring groove
        
        o-ring grove depth
        
        o-ring grove width
        
        Length at o-ring grove
        
        Defect in groove machining
      - Device Cartridge chamber
        
        too long before distal O-ring groove
        
        ID too wide at o-ring groove