Are These Capacitors Polyester or Polypropylene? - diyAudio
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Old 22nd September 2012, 07:08 PM   #1
dtm1962 is offline dtm1962  Canada
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Default Are These Capacitors Polyester or Polypropylene?

I picked up a pair of B&W Maxtrix 2 Series 1 and I was looking at the crossover and I had a question on the identity of these tan-coloured capacitors.

They PMT/2R type made by RCL.

View the photos and let me know if they are a Metalized Polyester or Metalized Polypropylene or ???
Attached Images
File Type: jpg Poly Cap 003.jpg (244.0 KB, 196 views)
File Type: jpg Poly Cap 006.jpg (220.3 KB, 188 views)
File Type: jpg Poly Cap 005.jpg (254.0 KB, 184 views)
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Old 22nd September 2012, 08:25 PM   #2
Elvee is online now Elvee  Belgium
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Most likely mylar, unless it's a very early series (< seventies), in which case they are PC, but that's unlikely.
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Old 22nd September 2012, 11:05 PM   #3
AMV8 is online now AMV8  United Kingdom
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Hi
I have a small pair of BW speakers and they use metalised polypropylene caps and they seem to be the same capacitors as in your crossover.
If your caps say PMT they are metalised polyproplyene capacitors.
Don
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Old 23rd September 2012, 09:17 AM   #4
Elvee is online now Elvee  Belgium
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Quote:
Originally Posted by AMV8 View Post
Hi
I have a small pair of BW speakers and they use metalised polypropylene caps and they seem to be the same capacitors as in your crossover.
If your caps say PMT they are metalised polyproplyene capacitors.
Don
To my knowledge, ITT only used PC and PET for their PMT molded series.

Of course, you can find on Ebay such caps sold as PP, but it has nothing to do with what is really inside the capacitor: more with the seller's margins...

Here, an example of honest seller:
PMT/2R-1.5UF-100V Capacitors - 4 in stock to buy, photo, pdf datasheet, rfq, obsolete


And here, a candid or "misinformed" one:
2 PCS ITT-GB PMT/2R Molded Capacitor 2.2uF / 10% / 250V | eBay

For the average sucker it makes no difference since there is no simple and accessible way to tell them apart
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