Film Capacitor Construction

[Timko]

I am ordering a few parts I need to build DeadEndFX's Mutron BiPhase pedal (or giant box on the floor), and needed to order a very specific Kingbright LED.  The only store stocking them was Newark, so I decided to try out their store for the other capacitors, switches, and ICs I need to grab.  While ordering capacitors, I noticed that there's more types of film than I had previously known.

Metallized PET Stacked
Metallized PET
Film / Foil PET
Film / Foil PP
Metallized PP
Metallized PPS

I looked through my last Mouser order, and saw a mix/match of Polypropylene (PP), Polyethylene Terephthalate (PET), and Polyester.  I was curious if I should be ordering one type over another, or whether I should simply order what's cheapest.

[EBK]

I always go with cheapest.  Audio is basically low-frequency, low-voltage, temperature-stable work, i.e., a set of really easy to meet specs.  More expensive caps tend to be designed for more demanding/fancy stuff.

[Timko]

That's what I thought.  Thanks!

[Bio77]

Since you are ordering from Newark, I usually look for a couple of specific brand/series, like  WIMA MKS2 or EPCOS B32529.  Then scan for the "red star" labeled ones they seem to always be blowing out for pennies.  Then I stock up    Shipping on Newark is expensive though.  Sometimes, even with the red star buys, it is cheaper to buy stuff from Mouser.