MKP caps: are these for real?

taj · 24th September 2007, 12:28 AM

I just bought some .1uF/250v caps off eBay from a guy in China. I'm a bit suspicious of their dielectric being metallized polypropylene as claimed. Based on their size, they seem much more likely to be metallized polyester.

Here's a photo of a .1uF/50v Panasonic ECQ-P metallized pp cap. (the large one on the left with the crimped leads); and then a Seacor .1uF/250v (the blue one) which I thought was already suspiciously small, and the new one from China is the orange one in the middle.

But technology and manufacturing isn't static so who knows. Anyone care to comment on the probability these are really MKP?

Thanks,

-- Todd

Peter Daniel · 24th September 2007, 12:43 AM

You will find Panasonic cap size here: http://www.panasonic.com/industrial/...bd0000ce16.pdf

taj · 24th September 2007, 12:47 AM

Hi Peter,

Yeah, I know about the Panasonic caps. I have the datasheets. They are much larger, as shown in the photo. It's the Chinese one that is suspicious.

..Todd

Magura · 24th September 2007, 01:00 AM

The easy solution is to break one open, and burn some of the dielectric. If the smoke smells like the smoke from a candle, it's sure polypropylene.

Magura

theAnonymous1 · 24th September 2007, 01:33 AM

Quote:

Originally posted by Magura
The easy solution is to break one open, and burn some of the dielectric. If the smoke smells like the smoke from a candle, it's sure polypropylene.

Magura

How many caps can I test this way before I'm at risk of cancer?

J/K

KP11520 · 24th September 2007, 01:37 AM

Hey J/K,

The smily sticking his tongue out really had me:

Too funny!

Regards//keith

taj · 24th September 2007, 01:52 AM

Quote:

Originally posted by Magura
The easy solution is to break one open, and burn some of the dielectric. If the smoke smells like the smoke from a candle, it's sure polypropylene.

And if it has little palm trees and brightly coloured flowers on it, then it must be polyester.

..Todd

Geek · 24th September 2007, 02:11 AM

Hi,

Lee's Electronics in Vancouver sells ones that look like those as PP. I did the "Steve Bench linearity test" on them and the curve was a perfect line, despite 0-12V DC bias

How long they will last, who knows?

Bottom line is... THEY AIN'T ORANGE DROPS LADDY!

Magura · 24th September 2007, 02:30 AM

Quote:

Originally posted by taj

And if it has little palm trees and brightly coloured flowers on it, then it must be polyester.

..Todd

Sorry I handed you a simple and bulletproof solution that didn't require any special instruments or tools....It won't happen again.

Please continue the wild guessing for the next few pages, as if I had never posted in this thread

Magura

taj · 24th September 2007, 02:46 AM

Quote:

Originally posted by Magura
Sorry I handed you a simple and bulletproof solution that didn't require any special instruments or tools....It won't happen again.

Please continue the wild guessing for the next few pages, as if I had never posted in this thread
Magura

Hey, I wasn't mocking you or your solution, Magura. I was just trying to be funny. (It won't happen again.) I fully intend to try your test.

But what does polyester smell like?

..Todd

24th September 2007, 12:43 AM	#2
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	You will find Panasonic cap size here: http://www.panasonic.com/industrial/...bd0000ce16.pdf __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

24th September 2007, 01:00 AM	#4
Magura diyAudio Member Join Date: Oct 2003 Location: Denmark, Viborg	The easy solution is to break one open, and burn some of the dielectric. If the smoke smells like the smoke from a candle, it's sure polypropylene. Magura __________________ Everything is possible....to do the impossible just takes a little while longer. www.class-a-labs.com

24th September 2007, 01:37 AM	#6
KP11520 diyAudio Member Join Date: Apr 2007	Hey J/K, The smily sticking his tongue out really had me: Too funny! Regards//keith __________________ If Wile E. Coyote had enough money to buy all that ACME ****, why didn't he just buy dinner?

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24th September 2007, 12:47 AM	#3
taj diyAudio Member Join Date: Feb 2005	Hi Peter, Yeah, I know about the Panasonic caps. I have the datasheets. They are much larger, as shown in the photo. It's the Chinese one that is suspicious. ..Todd

24th September 2007, 02:11 AM	#8
Geek diyAudio Member Join Date: Sep 2004	Hi, Lee's Electronics in Vancouver sells ones that look like those as PP. I did the "Steve Bench linearity test" on them and the curve was a perfect line, despite 0-12V DC bias How long they will last, who knows? Bottom line is... THEY AIN'T ORANGE DROPS LADDY!

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