[pure-silver] Re: Problem with 2 tray hypo (fixer).
- From: "Nicholas O. Lindan" <nolindan@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 4 Dec 2009 17:07:02 -0500
"Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
I got curious and wrote to S.C.Johnson, the maker of
Saran Wrap, to ask if any oxygen permeability tests were
ever made. I suspect they have but will know when they
answer. The same company also makes Zip-Lok bags and many
other products. Saran Wrap is polyethylene.
Saran wrap was made by Dow chemical. It was
polyvinylidene chloride (PVDC) and was impermeable to
pretty much everything. Saran is Dow's trade name
for PVDC.
The name "Saran Wrap" was sold to Johnson who uses
it to sell a completely different and badly performing
product in the US and Canada. It is now a polyethylene
wrap like Glad & Co, and is quite permeable - even
small bacilli can pass through it.
The product sold in the EU is (was?) still made from
PVDC.
The closest one can come to <real> Saran wrap is PVC
shrink-film wrap sold for meat packaging. I believe
Costco carries PVC wrap.
==
Nicholas O. Lindan
Cleveland Engineering Design, LLC
Cleveland, Ohio 44121
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