RE: speaking

RE: speaking

Posted by flood2 (A) on May 7, 2014 at 20:08:13

In Reply to: speaking posted by unclestu on May 7, 2014 at 11:28:07:

How was the temperature of 200°C established? You are getting very close to the moulding temperatures for polymers like polypropylene. Unless you have specifically chosen components rated for use in oil exploration, military or automotive applications, you are stressing the component, depending on how long you expose the component for, and risk altering the specification for which the product was tested to.
Let's ignore electrolytics which have a defined temperature rating based on service life and component tolerance specification - the formula for service hours based on temperature is well known as the electrolyte rapidly degrades with temperature. Subjecting electrolytics to such elevated temperatures is therefore foolish.

The heat deflection temperature of plastic caps varies according to the material and the actual value depends on the method of testing, but is around 85 degrees for polypropylene and similar for polystyrene depending on the barometric pressure for testing. Presumably you are trying to relieve stresses in the material, but the shapes are sufficiently simple that this should not be an issue and so the heat deflection temperature is a reasonable value to use. By taking the temperature up close to the melting temperature which is around 210°C for PP, you really are risking altering the performance of the device by potentially altering physical spacings of electrodes and degradation of materials.

Have you compared measurements before and after treatment? If you claim that your heat treatment does no damage and that all parameters such as self inductance, capacitance, ESR, loss tangent (which define the capacitor performance) are the same, how can you be sure that any sonic change you hear is not just due to wishful thinking?
Regards Anthony

"Beauty is Truth, Truth Beauty.." Keats

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Follow Ups Full Thread

Topic - cryo-treatment : risky for capacitors - markheadphonium 03:42:04 05/01/14 (23)

RE: cryo-treatment : risky for capacitors - Mr. Dick Hertz 08:40:17 05/07/14 (0)

I never had an issue - Awe-d-o-file 14:54:03 05/02/14 (1)

RE: I never had an issue - markheadphonium 15:03:17 05/02/14 (0)

RE: cryo-treatment : risky for capacitors - Mike B. 17:45:27 05/01/14 (0)

RE: cryo-treatment : risky for capacitors - Duster 10:10:50 05/01/14 (18)

RE: cryo-treatment : risky for capacitors - unclestu 15:02:38 05/01/14 (17)

RE: cryo-treatment : risky for capacitors - markheadphonium 16:57:48 05/01/14 (15)

RE: cryo-treatment : risky for capacitors - unclestu 17:46:22 05/01/14 (13)

RE: cryo-treatment : risky for capacitors - markheadphonium 14:28:35 05/02/14 (12)

RE: cryo-treatment : risky for capacitors - unclestu 16:32:03 05/02/14 (11)

RE: cryo-treatment : risky for capacitors - flood2 03:13:28 05/07/14 (9)

RE: cryo-treatment : risky for capacitors - Duster 18:39:32 05/07/14 (0)

speaking - unclestu 11:28:07 05/07/14 (7)

RE: speaking - flood2 20:08:13 05/07/14 (6)

LOL! - unclestu 20:43:38 05/07/14 (5)

RE: LOL! - Ubiquitous Biscuit 13:45:10 05/09/14 (0)

I hope this is obvious - Lew 12:07:17 05/08/14 (2)

Thanks - unclestu 14:55:57 05/08/14 (1)

I was sure - Lew 11:03:37 05/09/14 (0)

RE: LOL! - flood2 21:47:58 05/07/14 (0)

RE: cryo-treatment : risky for capacitors - markheadphonium 19:37:23 05/02/14 (0)

RE: cryo-treatment : risky for capacitors - unclestu 17:44:36 05/01/14 (0)

Good point (nt) - Duster 15:28:21 05/01/14 (0)

Follow Ups

RE: speaking - flood2 20:08:13 05/07/14 (6)

LOL! - unclestu 20:43:38 05/07/14 (5)

RE: LOL! - Ubiquitous Biscuit 13:45:10 05/09/14 (0)

I hope this is obvious - Lew 12:07:17 05/08/14 (2)

Thanks - unclestu 14:55:57 05/08/14 (1)

I was sure - Lew 11:03:37 05/09/14 (0)

RE: LOL! - flood2 21:47:58 05/07/14 (0)

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