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Old 24th September 2007, 12:28 AM   #1
taj is offline taj
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Question MKP caps: are these for real?

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
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Old 24th September 2007, 12:43 AM   #2
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You will find Panasonic cap size here: http://www.panasonic.com/industrial/...bd0000ce16.pdf
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Old 24th September 2007, 12:47 AM   #3
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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
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Old 24th September 2007, 01:00 AM   #4
Magura is offline Magura  Denmark
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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
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Old 24th September 2007, 01:33 AM   #5
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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
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Old 24th September 2007, 01:37 AM   #6
KP11520 is offline KP11520  United States
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Hey J/K,

The smily sticking his tongue out really had me:

Too funny!

Regards//keith
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Old 24th September 2007, 01:52 AM   #7
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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
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Old 24th September 2007, 02:11 AM   #8
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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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Old 24th September 2007, 02:30 AM   #9
Magura is offline Magura  Denmark
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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



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Old 24th September 2007, 02:46 AM   #10
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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
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