is acrylic based?  or ACF? did you check the temperature chart ship  
with the material?  does it always maintain below -20 C?  are those  
in tubes? what is the number of the tube? (filled from the same  
batch, the tube number such as XX-YYYY (number  of tube - batch  
number in addition to the date code).  Are those you buy direct from  
MFG?  or from distributors?  (if it is later, you might have  
contamination, such as silicone if it is epoxy based - silicone based  
lubricant might be used for refilling tube...etc.etc.)
best of luck.
jk
On Sep 20, 2018, at 5:54 PM, Richard Kraszewski wrote:

> I have a situation where  concern has been raised that shipment of  
> a conductive  adhesive in dry ice has caused abnormal adhesive  
> performance (Voiding/outgassing) during cure.
> To my recollection,  it was thought to be a best practice to ship  
> under-fills, glob tops, etc. in a foil bag when using dry ice due  
> to similar issues/concerns. Thought was that CO2  could penetrate  
> common plastic bags but not foil  (heat seal) bags.
>
> I would appreciate any and all thoughts/experiences on this matter.
> Both supporting or disputing this line of thinking.
>
> Many thanks in advance.
>
> Rich  Kraszewski
> Plexus - Senior Staff Process Engineer
> Phone: (920) 969-6075