Sorting through my boxes, I have quite a few foil-film caps. The size is within range of them being polystyrene, but I suspect mylar. Markings are black. ( clear/silver) My known newer polystyrene happen to have red markings.
Other than tossing one in acetone, any way to evaluate between polystyrene, poltpropo and polyester? The 1u and above that aren't bigger than a AA battery have to be polyester. It is the smaller ones. I suspect they are old enough they are not polypro. 80's vintage.
Other than tossing one in acetone, any way to evaluate between polystyrene, poltpropo and polyester? The 1u and above that aren't bigger than a AA battery have to be polyester. It is the smaller ones. I suspect they are old enough they are not polypro. 80's vintage.
If the foil winding is exposed, you just need to sample a tiny chip from one end.
Burn it, or place it on a soldering iron set at 450°C: if the smell is "waxy", it is PP, if it's neutral it's PC, less neutral PETP (mylar), and if it has a strong smell, it is PS.
If you send me a small piece of the film, I'll be able to tell you within minutes of receiving it. Email me at my initials at syclotron.com.
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