Dry storage and relative humidity

hi

I'm looking for regulation / standard / publication regarding of relative humidity levels, which describe exactly from the value is considered "dry"

I need this for dried medicinal plant storage, because the authority did not agree with me. they saw a RH 80% for few days (rainy days), and they said is a major problem , but I could not find not even in European Pharmacopeea "keep in a clean and dry place".

If there is no such a document how can I calculate?

Thanks for advance for your replies.

kox

Dear Kox..

IMO.. Dry air mean is abolute humidity (number of water in air).. thats different from Relative Humidity (RH).. to get Absolute humidity you have state what is the temp. when the RH 80%...

And for the standard "Dry Air" thats depends on the product..so I think you have to know your product properties and define that standard storage of your product (Temp. and RH)...

rgds

AS NUR

Dear Kox,

I guess the auditor was not fully wrong. A high RH might affecting the shelf life of the product. And as AS Nur was mentioned, it really depends on the characteristics of your products. Some products wont stand long in high RH, but some products must be stored in high RH. So the first thing to do in my opinion is to learn your product stability during shelf life test.

I hope these links might help you a bit:

http://www.medlabs.c....aspx?FileID=59

http://www.emea.euro...wp/614203en.pdf


Regards,


Arya

thank you for your help

i try to calculate as like you sad

i find an interesting website for calculation
http://www.vaisala.c.....uments/rhcalc

Dear kox,

Very interesting link, thank you very much


Regards,


Arya

yup.. thanks for the link kox

with pleasure