How often do I need to test?
Regularly! Having used SIR to achieve OE, you now need to prove it repeatably! You can do this quickly and effectively on a shop floor using the Ionic Contamination technique for process control.
If OE study has been completed then the PICT test is used to establish that OE is being met on a routine basis. If a process or materials are changed this can trigger a new OE evaluation using the SIR test, and from this a new PICT value can be established and the process limits are updated.