Hi fellows,
I made a little experiment, because I wanted to find out, to which extend the precautions regarding styroflex caps must be met.
Often it is said that polystyrene caps are uber sensitive to heat and to Isopropanol.
So I took a NOS Siemens 10nf 160V polystyrene capacitor and connected it to a 60000 count multimeter and measured 9.672nf.
While still connected I rubbed 99% IPA on it - only very little changes in capacity, I assume because of the alcohol still on the cap.
After it dried it moved back to 9.672nf.
Then I dunked the cap in alcohol and left it to sit there 5 minutes. When I came back and took the cap out of the Ipa the capacitance moved back to 9.672nf.
The next test was the heat test. I put my iron at 330 degrees Celsius and started to heat the lead wire of the cap next to the body.
Immediately the capacitance started to rise up to 10.03nf, after ca. 10 seconds I let the cap cool down. Contrary to what I heard before, the capacitance went back to original after the cap had cooled down. I repeated this test several times with the same outcome.
Then I heated the cap continuously until it started to melt where the wire connects to the body, capacitance now was at 10.4nf.
Even after this extreme heating (ca. 20 seconds) the capacitance went back down, but not to the original value, instead it halted at 9.880nf.
I think I'm going to repeat this test with another brand capacitor, but for now my conclusion is that I was far too afraid regarding the use of alcohol near the polystyrene caps.
Regarding heat, one should be careful but if the heating is in normal timespan of a few seconds nothing bad happens.
What do you guys say?
Did I totally mess this up? :
Or are the results somewhat reliable?
I'm waiting for your responses
Cheers
Moshe
I made a little experiment, because I wanted to find out, to which extend the precautions regarding styroflex caps must be met.
Often it is said that polystyrene caps are uber sensitive to heat and to Isopropanol.
So I took a NOS Siemens 10nf 160V polystyrene capacitor and connected it to a 60000 count multimeter and measured 9.672nf.
While still connected I rubbed 99% IPA on it - only very little changes in capacity, I assume because of the alcohol still on the cap.
After it dried it moved back to 9.672nf.
Then I dunked the cap in alcohol and left it to sit there 5 minutes. When I came back and took the cap out of the Ipa the capacitance moved back to 9.672nf.
The next test was the heat test. I put my iron at 330 degrees Celsius and started to heat the lead wire of the cap next to the body.
Immediately the capacitance started to rise up to 10.03nf, after ca. 10 seconds I let the cap cool down. Contrary to what I heard before, the capacitance went back to original after the cap had cooled down. I repeated this test several times with the same outcome.
Then I heated the cap continuously until it started to melt where the wire connects to the body, capacitance now was at 10.4nf.
Even after this extreme heating (ca. 20 seconds) the capacitance went back down, but not to the original value, instead it halted at 9.880nf.
I think I'm going to repeat this test with another brand capacitor, but for now my conclusion is that I was far too afraid regarding the use of alcohol near the polystyrene caps.
Regarding heat, one should be careful but if the heating is in normal timespan of a few seconds nothing bad happens.
What do you guys say?
Did I totally mess this up? :
Or are the results somewhat reliable?
I'm waiting for your responses
Cheers
Moshe