Silica paks

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Can anyone advise on how often a silica gel pack should be changed in a safe or safety deposit box?

It depends of the humidity which can gon inside the box.  Worst in summer, least in winter. 
The best is having silica gel impregnated with an indicator:  blue when dry and it turns pink when saturated with humidity.  But if yours is colorless, impossible to say visually. 

In this case, the best you can do is to dry them periodically (once a month for example).  In any case, you can dry them in a kitchen oven set at 300°F and let dry for at least one hour (the packaging should resist to this temperature), or until the indicator revert back to blue.  The silica gel can be regenerated indefinitely if kept clean.

 Hope it can help.

Can anyone advise on how often a silica gel pack should be changed in a safe or safety deposit box?

I change the packets every month regardless of the time of year.  Better safe than sorry.  If you are interested, I can send you as many packets and/or vials as you like for FREE.  Your cost is only my cost on the postage.  If interested email me at   mikez@scsinternet.com

FRIEDSQUID

Friedsquid

Thank you very much I think I will take you up on your generous offer.

copperpete

Thank you for the very detailed info, much appreciated

Cheers All

Jason

Do you have some available for me
ABYSS

Do you have some available for me
ABYSS

Please email me your address again.
FRIEDSQUID