General > General Technical Chat
How safe is vinyl for other plastics?
Alex Eisenhut:
I bought a bunch of resealable pouches and when I got them they smelled of vinyl. I didn't think vinyl was still used these days.
Storing old junk like 30 year old disk drives, etc, often I notice burn marks on the plastic cases which turn out to be caused by a chemical reaction between whatever plastic cables are made from and whatever the case is made from.
I guess cases are usually made from ABS.
Is storing stuff inside vinyl bags safe long-term?
I also plan to keep other junk organized in pouches.
What is a better material for storing things long term?
jpanhalt:
Do you mean PVC? https://en.wikipedia.org/wiki/Vinyl_group
Yes, I would be concerned about "vinyl" goo transferring to anything valuable.
rdl:
It's called plasticizer migration. It's a fairly complex phenomenon. To be completely safe you'd have to avoid bags made with any kind of plasticizer.
james_s:
I've run into that a few times with power cords wrapped around thing. I also had it happen when I left rolls of two different types of tape stacked on a shelf. I don't remember what one of them was but the one that melted was that thin yellow tape often used to cover transformer windings. The spots where the other tape rested on it fused together into sticky yellow blobs. It's a really annoying phenomenon and I've never seen a list of material compatibility.
amyk:
--- Quote from: rdl on October 04, 2021, 01:38:51 am ---It's called plasticizer migration. It's a fairly complex phenomenon. To be completely safe you'd have to avoid bags made with any kind of plasticizer.
--- End quote ---
I believe only polyethylene doesn't have plasticisers; fortunately, regular plastic bags are polyethylene.
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