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Old 28th June 2005, 02:05 AM   #1
AJinFLA is offline AJinFLA  United States
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Default Removing dustcap from a Polypropylene driver

I read an earlier post about driver mods "Repairing and modifying speakers" where it was suggested that acetone/heat could be used to loosen the glue used on dustcaps. But I believe most of the references were to paper cone drivers. What about a Polyprop driver. I would imagine that too much heat would certainly be detrimental, perhaps a (hair) blowdryer max'd out - at most. Any suggestions as to whether acetone would be safe - or not? Thanx.

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Old 28th June 2005, 04:55 AM   #2
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...or not

tested it out on a dead sud that had a polypropylene cone and the cone is discoloured where the acetone was in contact with it, not sure what other damage it does but the discolouration is a sure sine in my books that its a bad idea. mabey someone else knows diffrent though?

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Old 28th June 2005, 12:05 PM   #3
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I forsee a melting situation here, both with the heat and the chemicals. If you must, try a sharp knife, possibly lighly heated. Or just leave as is and accept the quack.
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Old 28th June 2005, 12:28 PM   #4
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PP adhesives are most difficult to work off - as pp is difficult to glue in the first place

check if the dustcap has been fitted with a rubber toughened adhesive or epoxy

for epoxy benzoyl acetate will be the best - you will have to apply it atleat 3 to 4 times with a couple of hours gap and wait over night for the benzene to have effect

for rubber toughened you can try the above or dexterly work it off with a slightly heated sharp object like a knife - need to mention you need to be ultra careful not to destroy the cone itself

best would be if u could practise once on another - burn out or very cheap - car audio unit or some thing similar

also keep applying pressure on the cone pressing it down from near the dustcap after you feel the dustcap is a little loose - most probably it will pop out prising its own self free with the uneven force against the glued surface from the cones face

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Old 29th June 2005, 12:02 AM   #5
AJinFLA is offline AJinFLA  United States
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Thanx for all the advice. Suranjan, it definately sounds like worked w/ many a driver before . I'll proceed carefully. Holiday weekend coming up. Should be fun .


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