Storage of ICs in the lab

For the small quantities you mention, anti-static flip-top boxes (~ 40mm x 40mm) with a conductive foam liner is probably most appropriate and you can stack and label them easily. I did some research a few years ago about operating ICs in a vacuum and manufacturers didn't recommend it so I would assume storing them that way is also a bad idea. Nitrogen at normal atmospheric pressure is a possibility but very expensive.

Brian.

Vacuum packs don't completely prevent diffusion of water vapour. I'd use hermetic sealed antistatic bags with dry agent as distributors do for IC shipping. At least antistatic zip bags with dry agent.

Would you please suggest a device for hermetic seal anti static bags.

Thanks for sharing your ideas and example of storing ICs. I actually have seen somewhere that removes the air from the anti static and then seal air tight. I guess this called hermetic sealed anti static bag. Any suggestion how I can find such the device. I am sorry I don't even know the proper name of the device but I have seen it some years ago and used once.

I just use ESD zip-lock bags saved from incoming samples.
If I'm looking to preserve electrical abuse signatures I will
then put them in the freezer for later or much later. I do not
worry about moisture since everything I do goes into hermetic
packaging with gold plated leads. But wafers I just bag and
store in a file cabinet, figuring they'll bond up well enough
for lab uses (I do not handle "valued product").

Industrially, often non-shippable wafers are stored in
dessicators (silica gel, color-change). Also see file cabinets
with a nitrogen gauge-and-orifice feed used sometimes.

If you mean to store shippable product you will need to
use something that your flowed down spec mountain
says is legit, and have it on cal (what cal?) schedule like
other production equipment.

But for me "good enough" has been good enough.