We recently had a customer audit and they brought up our lack of humidity control. We have sensors around the production floor monitoring but lack a way of controlling the humidity levels. We’re curious to see what control measures other facilities have.
More importantly, we’re curious to know if our current ESD workstation, flooring, and continuous monitor testing/checks are an adequate verification for when the humidity levels do drop below 30%.
J-STD001 Reference
Zachariah,
It depends on what humidity level you used for product qualification. If you used the humidity that is in most STMs which is 12% +/- 3% then 30% humidity is well above that and shouldn’t be a concern. If you used the lowest annual humidity of the facility, which is allowed in ANSI/ESD S20.20, then as long as your actual humidity is above the lowest annual humidity in the factory, you should be fine as well.
Hello ,
Greetings of the day from India .
As our Andy Sir has clarified, the respective PQ tests per ANSI /ESD STMs needs to be conducted and certified @ Rh 12% +/- 3% in which case when the product is put into use at any Rh level over and above this is of no concern .
On the other hand if it has been qualified at the lowest annual minimum Rh% at the installed facility at less than 30 % or less it is of no concern when the facility’s Rh % goes down below 30%. If not, re qualification is advised when the Rh% is below the minimum recorded over the year.
