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Old 17th June 2012, 11:14 AM   #1
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Default damage to petp caps

i'm suspecting that i might have damaged the russian k71-16 petp cap from too long a soldering.

is it possible for the polystyrene cap to retain value but lose dc blocking capability from heat damage? and do you think damage from soldering could occur to large value caps such as 22uf?
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Old 17th June 2012, 12:37 PM   #2
AndrewT is offline AndrewT  Scotland
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What tests or symptoms lead you to the tentative conclusion that you have damaged your capacitor?
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Old 17th June 2012, 03:37 PM   #3
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a suspicion is not a conclusion.
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Old 17th June 2012, 03:41 PM   #4
AndrewT is offline AndrewT  Scotland
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No symptoms and no tests then?
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Old 17th June 2012, 04:29 PM   #5
kevinkr is offline kevinkr  United States
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Start by measuring leakage current and capacitance to know whether or not it is damaged..
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Old 17th June 2012, 05:12 PM   #6
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a] Polystyrene capacitors are not available in large values like 22uF.
b] The DC resistance of a polystyrene capacitor is just about infinite.
c] Polystyrene capacitors are easily damaged/destroyed by overheating when soldering.
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Old 17th June 2012, 05:45 PM   #7
AndrewT is offline AndrewT  Scotland
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What does petp stand for?
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Old 17th June 2012, 06:18 PM   #8
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by AndrewT View Post
What does petp stand for?
Polyethylene-terephtalate, AKA mylar, AKA polyester, AKA Hostaphan, etc

Quite heat-resistant compared to many polymers, particularly polystyrene
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Old 17th June 2012, 07:15 PM   #9
Jadran is offline Jadran  Croatia
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Quote:
Originally Posted by Speedskater View Post
a] Polystyrene capacitors are not available in large values like 22uF.
b] The DC resistance of a polystyrene capacitor is just about infinite.
c] Polystyrene capacitors are easily damaged/destroyed by overheating when soldering.
PETP are not polystyrene caps. but
Metallized Polyethylene Terephalate-Film Capacitors
and are well available at 22uF, for example 63V PETP Capacitors K73-16
it seems PreSapian made a mistake at opening post?!

Last edited by Jadran; 17th June 2012 at 07:19 PM.
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Old 18th June 2012, 02:42 AM   #10
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oops. thank you gents. seems that mistake is a common one for a lot of places list k71-16 as polystyrene.

work stress had making me thick headed for the last week. haha please forgive me.

Last edited by PreSapian; 18th June 2012 at 02:48 AM.
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