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K40Y-9 capacitors- PCB hazzard?
K40Y-9 capacitors- PCB hazzard?
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Old 19th July 2018, 09:14 PM   #1
Alan Dubski is offline Alan Dubski
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Default K40Y-9 capacitors- PCB hazzard?

Hi all,
I been reading varying things regarding these caps and was hoping for some advice/opinions. Some comments I have read say they contain PCBs while others say its some type of mineral oil. Is there any consensus here on what oil is actually inside?

K40Y-9: Questions And Comments

While the caps show no sign of leaking - and I have no intention of opening them up- I am bit worried that give it enough time they will fail and leak oil? With a small child (with one maybe on the way) perhaps I should not have them in the house at all ?

Thank you all- appreciate your thoughts
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Old 19th July 2018, 09:23 PM   #2
Matt BH is offline Matt BH  United Kingdom
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Not sure what's in them it could well be PCB's but I would not worry about it leaking at all. The ends of the caps are hermetically sealed with glass insulators. The only way they could leak is if they were crushed or cut open or maybe rusted completely through. I have some 60 odd year old hermetically sealed transformers that contain PCB's and they have not leaked.

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Old 19th July 2018, 09:24 PM   #3
sony6060 is offline sony6060  United States
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Over last 20 years, never experienced a leak. However, not sure of PCBs. A tiny amount likely would not damage an adult, however children are very, very sensitive.
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Old 19th July 2018, 11:11 PM   #4
gofar99 is offline gofar99  United States
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Hi, I too have no idea what might be in them. But I use them all the time and they are extremely durable and IMO nearly impossible to make leak.
Good Listening
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Old 20th July 2018, 03:16 AM   #5
lexx21 is offline lexx21  United States
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K40Y-9 capacitors- PCB hazzard?
K40-9 caps are paper and oil. The green russian caps do have something else in them as they are poly caps. Don't mistreat the caps and you are good to go.

Do a search and you can find out what they contain. I think the article was posted on here about 2 or 3 years ago.
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Old 20th July 2018, 04:34 AM   #6
BillWojo is offline BillWojo  United States
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The hazards about chemicals like PCB's usually came to light when the factories that used these chemicals started having higher rates of illness or cancers of unusual forms. Often times these chemicals were thought to be harmless so no precautions were used at all. Imagine being on the line that was filling power pole transformers all day long and being covered in this stuff.

So a small leaking cap should not really be much of a concern, your exposure is minimal at best. Just use common sense, don't lick your fingers if you get in on your hands and wash well after.

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Old 20th July 2018, 06:11 AM   #7
Wavebourn is offline Wavebourn  United States
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K40Y-9 capacitors- PCB hazzard?
If it does, you risk of getting a birth defect... :-(
Nothing in the universe is perfect. The ideal things are the ones that are most optimal. Optimization criteria, what matters. When I hear "No Compromise Design", I want to take a sledgehammer and test how impact-proof it is.
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Old 20th July 2018, 09:39 AM   #8
Enzo is offline Enzo  United States
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Your cap would have to be crushed or otherwise cracked open on the circuit board inside your unit, then your kids would have to take it apart and then eat the crushed part. I find the risk of that exposure extremely low. Much lower than say the things from car exhausts they breath every time you take them on the roads.
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Old 20th July 2018, 01:30 PM   #9
mchambin is offline mchambin  France
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I do have a cap that blew open.
A 20 microFarad 400 volt AC cap from a compressor motor that I recovered from scraps.
The top is off, there is liquid inside.
I sure handled it with care.
What is the risks ? How to dispose of this ?
Transistor junction temperature is not transistor case temperature.
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Old 21st August 2018, 12:24 PM   #10
onokun is offline onokun  Russian Federation
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Hi all, since I'm in Russia, I've made a research to find out what capacitor series made in ussr contained PCB or 'Совтол' in Russian.

All the series listed in russian to help identify the caps.



Long story short k40y-9 doesn't contain PCB chemicals - they are just ordinary pio caps.
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