Dear Experts,
would like to seek your expertise regarding product qualification. here is the scenario. i have plastic tray corrugated and slotted trays. would like to ask if the point-to-point measurement using 2-5lbs probe can be used to measure the surface resistance. Say tray has 6x6in dimension. Also same with tube with surface width of 2inches.
please let me know your thought.
thank you.
Rosalie,
Product qualification of packaging per ANSI/ESD S20.20 can be done per ANSI/ESD STM11.11, 11.12, or 11.13. You specifically asked if two 5 lb probes could be used for surface resistance measurements. STM11.11 uses a concentric ring electrode and 11.13 uses the 2-point probe for surface resistance measurements. Using two 5 lb probes may work although you would need to show equivalence to the concentric ring electrode and need to write a tailoring statement in your ESD control program plan.
Another option, if you haven’t adopted S20.20, is to use compliance verification data. S20.20 states “Organizations that can verify the use of ESD control items before adopting this standard to certify their ESD control program can use compliance verification records to meet product qualification requirements. These records shall cover a minimum of one year and reflect a timeframe immediately before using as product qualification records. These records shall reflect test results that meet the compliance verification test limits identified in Tables 2, 3, and 4 of this standard.” So if you have a year’s worth of data using the 5 lb probes and they meet the requirements of S20.20, you could use these for product qualification. Thanks.
Dear Andy,
thank you for the input.