Not sure if this post should be in the Materials section, but in any case...
I am carrying out a cryopreservation protocol, which suggests the use of a slow freezing container, such as this: http://www.nalgenelabware.com/products/productDetail.asp?product_id=405
Basically it is a polycarbonate box stuffed with foam. The foam is saturated with isopropanol. The cryovials are placed within the foam and then refrigerated at -80o
C. It enables the vials to freeze at a slow rate.
I don't have such a box, and my department is apparently broke so I'm trying to make one myself.
Do you know if any common household plastic box can withstand -80o
From what I read, polypropylene crumbles at low temperatures. HDPE does not withstand it either.
I would appreciate any of your suggestions.