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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Deterioriating Foam in Instrument Cases?
Instrument cases often have foam to hold the stuff.
And it eventually turns to flakey, oily gunk. Is there a prevention/remedy for this? Will leaving the case open slightly materially affect this degeneration? Thanks, mike -- Return address is VALID but some sites block emails with links. Delete this sig when replying. .. Wanted, PCMCIA SCSI Card for HP m820 CDRW. FS 500MHz Tek DSOscilloscope TDS540 Make Offer Wanted 12" LCD for Compaq Armada 7770MT. Bunch of stuff For Sale and Wanted at the link below. MAKE THE OBVIOUS CHANGES TO THE LINK htremovethistp://www.geocities.com/SiliconValley/Monitor/4710/ |
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And it eventually turns to flakey, oily gunk.
Is there a prevention/remedy for this? Ozone and heat accelerate the process. Some instruments by their very design generate ozone and heat internally. Keeping the foam away from direct sunlight certainly doesn't hurt, my experience is that sunlight accelerates the process even more. Best long-term strategy may be to remove the foam while it's intact, before it deteriorates, and replace it. Especially if there's a fan to distribute the little gunky particles around, cleaning up after the fact is a real pain. This isn't always easy because often the foam is glued in place (and the glue tends to go gooey and gunky itself.) Tim. |
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The remedy is to use much better foam. Polyurethane foam
isn't intended to last a long time. mike wrote: Instrument cases often have foam to hold the stuff. And it eventually turns to flakey, oily gunk. Is there a prevention/remedy for this? Will leaving the case open slightly materially affect this degeneration? Thanks, mike |
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In article , Mike Berger wrote:
The remedy is to use much better foam. Polyurethane foam isn't intended to last a long time. I would say most intenders intend it to last. but have been bitten including speaker companies. Better, as in lasting longer? I have not really seen any other common soft pliable foam. greg mike wrote: Instrument cases often have foam to hold the stuff. And it eventually turns to flakey, oily gunk. Is there a prevention/remedy for this? Will leaving the case open slightly materially affect this degeneration? Thanks, mike |
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On Thu, 04 Aug 2005 23:30:33 -0700 mike wrote:
Instrument cases often have foam to hold the stuff. And it eventually turns to flakey, oily gunk. Is there a prevention/remedy for this? Will leaving the case open slightly materially affect this degeneration? I doubt there is anything you can do about it. I'm sure that it is just something that occurs with a particular kind of foam. I've seen it in turntable mats and in instrument cases which hadn't been opened in 20 years. My only solution is to try to make a nice replacement from something which I HOPE will last longer. So far, so good. - ----------------------------------------------- Jim Adney Madison, WI 53711 USA ----------------------------------------------- |
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On Fri, 05 Aug 2005 22:49:42 -0700 mike wrote:
Jim Adney wrote: My only solution is to try to make a nice replacement from something which I HOPE will last longer. So far, so good. What did you use that you hope will last longer? I have just used stuff that I found with packing material, and that SEEMED okay. This is totally unscientific. I've done this a couple of times and so far, so good, but one of them may break down next year and I won't have any better idea of what to do. Sorry, but I really don't know what the stuff I used was. Not that it would have mattered much, because I don't know what the bad stuff was. I've got some samples from a foam company. I should call them and see if they can offer any advise. I've used polyurethane foam in other applications and that seems to be very stable and durable, but they only had it in cream color. For the instruments I was repacking, I wanted black. The polyurethane foam went into a VW engine environment. It has held up well with heat, oil, and fumes for about 15 years with no sign of breaking down, so I would guess that if you could find polyurethane that you liked, it would be a good bet. - ----------------------------------------------- Jim Adney Madison, WI 53711 USA ----------------------------------------------- |
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You used to be able to get latex based foam that would last a long
time. It wasn't as pliable as the polyurethane, so you'd have to die-cut it. GregS wrote: In article , Mike Berger wrote: The remedy is to use much better foam. Polyurethane foam isn't intended to last a long time. I would say most intenders intend it to last. but have been bitten including speaker companies. Better, as in lasting longer? I have not really seen any other common soft pliable foam. |
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