Date   

Re: Beware of old AntiStatic foam

-
 

Bruce Gentry said:

One reason polyurethane was so popular for drive rollers and belts is
it's traction. Many tape recorders used them because they could be
smaller and cheaper yet able to grip and carry the power. It is
certainly possible to find replacements that will fit, but often they
will slip under heavy load.

Years ago I talked to one of HP's calculator engineers in Oregon and he
told me that they had about given up on building a reliable card reader for
the HP-65 and similar calculators because of slippage, until they
discovered polyurethane. But it said that it gripped so well that they
could dip the magnetic cards in oil and the polyurethane rollers would
still feed them!

Unfortunately the rollers that HP used in all of their calculators have
all deteriorated with age.



On Sun, Mar 21, 2021 at 3:59 PM greenboxmaven via groups.io <ka2ivy=
verizon.net@groups.io> wrote:

One reason polyurethane was so popular for drive rollers and belts is
it's traction. Many tape recorders used them because they could be
smaller and cheaper yet able to grip and carry the power. It is
certainly possible to find replacements that will fit, but often they
will slip under heavy load.

Bruce Gentry, KA2IVY

On 3/21/21 14:26, snapdiode via groups.io wrote:
On Sun, Mar 21, 2021 at 11:06 AM, Bert Haskins wrote:
Yep they used something like this in drive belts also.

Yes my TEAC X-3 just had a "belt melt", it is hard ti understand why
they can't be made in silicone rubber now. That should be practically
eternal in comparison to my lifespan....









Re: Beware of old AntiStatic foam

-
 

Steven said:

Another “plastic rot” question. I have a set of Xcelite tools. One of them,
a stubby Philips screwdriver, developed a white coating on it that was
impossible to remove without sanding it off. I could get some of it off,
but it kept re-developing this. None of the other tool handles has done
this. The handles, I believe, are a butyrate plastic that gives off butyric
acid as it oxidizes but they all are and this is the only one that
developed this white coating. The whole tool kit smells rather like vomit
(my wife refers to it as my “vomit tool case”) but this is common with
butyrate plastic-handled tools.

That butyrate plastic deteriorates into butyric acid and yes, I'm told
that that is what gives vomit it's nauseating smell. It's similar to, or
the same, compound found in milk that is going bad so human reaction to
that smell is thought to be a survival mechanism. I soak those old Xcelite
tools in full strength household ammonia and then scrub them with a brass
bristle brush or a tough nylon pot scrubber and that will remove the white
film on the tools. You may need to repeat the process a few times.
Surprisingly, even a brass bristle brush doesn't seem to harm or to scratch
up the plastic handles (YMMV!) I've cleaned several dozens of Xcelite
tools like this over the past 6 or 7 years and I've never found any sign of
damage by cleaning that way.

On Sun, Mar 21, 2021 at 2:49 PM stevenhorii <sonodocsch@gmail.com> wrote:

I think polyethylene foam instead of the black polyurethane foam does not
have the “get goopy and stick to everything” problem. Has anyone had
polyethylene foam degrade like the black stuff? I have not - either black
or white polyethylene has stood the “test of time”. I have seen foam rubber
turn to dust, but at least it does not (in my experience) get sticky.

Apparently the polyurethane foams also outgas as they degrade and this can
leave deposits on stuff - think camera optics as many camera carrying cases
use polyurethane foam.

If I have some custom-fitted black foam in a transit case, I put the item
in a plastic bag and before putting it back in the case.

Another “plastic rot” question. I have a set of Xcelite tools. One of them,
a stubby Philips screwdriver, developed a white coating on it that was
impossible to remove without sanding it off. I could get some of it off,
but it kept re-developing this. None of the other tool handles has done
this. The handles, I believe, are a butyrate plastic that gives off butyric
acid as it oxidizes but they all are and this is the only one that
developed this white coating. The whole tool kit smells rather like vomit
(my wife refers to it as my “vomit tool case”) but this is common with
butyrate plastic-handled tools.

A comment on Duracell batteries. I am pretty sure there are counterfeits
out there - particularly the “bulk packs” with no Duracell label on the
outside. Here’s an article on fakes:


https://www.thecounterfeitreport.com/product/106/Duracell-Coppertop-AA---AAA-Batteries.html

When I have had Duracell batteries (the AA ones in particular) leak, on
checking, they were the ones I bought in unlabeled bulk packs. I generally
remove batteries from equipment I am not going to use frequently.

Steve Horii

On Sun, Mar 21, 2021 at 12:01 Harvey White <madyn@dragonworks.info> wrote:

As I've mentioned previously, the latest run of Duracell (guaranteed not
to leak before 10 years) does exactly that, and often in the package.

The good news is that they will often give you money to replace the
damaged item if you call them. Their warranty is "repair or replace",
but you do have to call.

I've had the foam in probe cases crumble, (both HP and Tek), anti static
foam corrode and crumble, etc...

Harvey


On 3/21/2021 9:50 AM, David Slipper wrote:
Nasty!! I wonder what other time-bombs are awaiting us!?

I'll certainly be checking my stock of bits and spares.

I always assumed that a famous brand of NiMh batteries were supposed
to be leak proof - Hah! I nearly lost a pair of nice walky-talkies and
a multimeter that way, so now cells get removed from rarely used items
and I make a point of checking torches and the like regularly.

Sadly not surprised at anything these days,
Dave


On 21/03/2021 13:07, - wrote:
Well, this thread just showed up on EEVBlog. This is exactly the
kind of
damage that I used to see happen to IC and to TE accessories that were
stored in the old antistatic foam.

<
https://www.eevblog.com/forum/chat/beware-of-old-antistatic-foam/?topicseen

















Re: 7D15 internal trigger not working

Dan G
 

I just did a quick measurement on my 7D15, with the plug-in installed in a horizontal slot,
and being fed a 1 MHz 5 div p-p sine wave from a vertical amplifier. The 7D15 was set to
measure frequency, TRIGGER B selector set to TRIG SOURCE.

The 5 div signal from the vertical amplifier becomes a 840 mV p-p signal measured
at R117 with a 10X high-Z probe. It is symmetrical about 0V. Observing the signal
here will tell you the effect of the Q203/Q213/Q217 amplification stage, and you
should be able to see any contact resistance issues with cam switch contact
number 12.

R117 is readily accessible with the right mainframe cover removed if you install
the time base in Horizontal slot A, and the 7D15 in the Horizontal slot B.


I hope this helps,

dan


Re: Beware of old AntiStatic foam

greenboxmaven
 

Polyethylene definately seems to be benign and long lasting.  With regard to Xcelite handles and other items, I had to spend my youth in the place many of those stinky plastics were developed and made. The entire town smelled like the plastic, it was not nice. In addition to stinking and getting covered with white crud, the plastics often shrink and warp as they age. One positive thing about those plastics was their feel and grip confort. Many vintage typewriters and teleprinters had keys made of them because they were easier on fingers after hours of typing.

   Bruce Gentry, KA2IVY

On 3/21/21 14:49, stevenhorii wrote:
I think polyethylene foam instead of the black polyurethane foam does not
have the “get goopy and stick to everything” problem. Has anyone had
polyethylene foam degrade like the black stuff? I have not - either black
or white polyethylene has stood the “test of time”. I have seen foam rubber
turn to dust, but at least it does not (in my experience) get sticky.

Apparently the polyurethane foams also outgas as they degrade and this can
leave deposits on stuff - think camera optics as many camera carrying cases
use polyurethane foam.

If I have some custom-fitted black foam in a transit case, I put the item
in a plastic bag and before putting it back in the case.

Another “plastic rot” question. I have a set of Xcelite tools. One of them,
a stubby Philips screwdriver, developed a white coating on it that was
impossible to remove without sanding it off. I could get some of it off,
but it kept re-developing this. None of the other tool handles has done
this. The handles, I believe, are a butyrate plastic that gives off butyric
acid as it oxidizes but they all are and this is the only one that
developed this white coating. The whole tool kit smells rather like vomit
(my wife refers to it as my “vomit tool case”) but this is common with
butyrate plastic-handled tools.

A comment on Duracell batteries. I am pretty sure there are counterfeits
out there - particularly the “bulk packs” with no Duracell label on the
outside. Here’s an article on fakes:

https://www.thecounterfeitreport.com/product/106/Duracell-Coppertop-AA---AAA-Batteries.html

When I have had Duracell batteries (the AA ones in particular) leak, on
checking, they were the ones I bought in unlabeled bulk packs. I generally
remove batteries from equipment I am not going to use frequently.

Steve Horii

On Sun, Mar 21, 2021 at 12:01 Harvey White <madyn@dragonworks.info> wrote:

As I've mentioned previously, the latest run of Duracell (guaranteed not
to leak before 10 years) does exactly that, and often in the package.

The good news is that they will often give you money to replace the
damaged item if you call them. Their warranty is "repair or replace",
but you do have to call.

I've had the foam in probe cases crumble, (both HP and Tek), anti static
foam corrode and crumble, etc...

Harvey


On 3/21/2021 9:50 AM, David Slipper wrote:
Nasty!! I wonder what other time-bombs are awaiting us!?

I'll certainly be checking my stock of bits and spares.

I always assumed that a famous brand of NiMh batteries were supposed
to be leak proof - Hah! I nearly lost a pair of nice walky-talkies and
a multimeter that way, so now cells get removed from rarely used items
and I make a point of checking torches and the like regularly.

Sadly not surprised at anything these days,
Dave


On 21/03/2021 13:07, - wrote:
Well, this thread just showed up on EEVBlog. This is exactly the
kind of
damage that I used to see happen to IC and to TE accessories that were
stored in the old antistatic foam.

<
https://www.eevblog.com/forum/chat/beware-of-old-antistatic-foam/?topicseen











Re: Beware of old AntiStatic foam

greenboxmaven
 

One reason polyurethane was so popular for drive rollers and belts is it's traction. Many tape recorders used them because they could be smaller and cheaper yet able to grip and carry the power. It is certainly possible to find replacements that will fit, but often they will slip under heavy load.

    Bruce Gentry, KA2IVY

On 3/21/21 14:26, snapdiode via groups.io wrote:
On Sun, Mar 21, 2021 at 11:06 AM, Bert Haskins wrote:
Yep they used something like this in drive belts also.

Yes my TEAC X-3 just had a "belt melt", it is hard ti understand why they can't be made in silicone rubber now. That should be practically eternal in comparison to my lifespan....




Re: 7D15 internal trigger not working

Dan G
 

On Sun, Mar 21, 2021 at 01:26 PM, Steve Nossen wrote:

Measured the transistors and Q213 measures 30 ohms from C to E and E to C on
my SImpson 260. Much higher on a DVM but the same in both directions. Seems
leaky to me. Q203 measured more like a diode, conducts in one direction.
Q213 pins are connected to GND and +5V rails with very low value resistors, so
I would be suspicious of any in-circuit resistance measurements.

A non-invasive test of the basic health of these transistors is to
check the operating point voltages of Q203, Q213 and Q217, and compare
them against the expected values provided in schematic <1>. This check
should not need a signal applied to A20/B20, so the plug-in can be operated
in the vertical compartment for ease of access. (Unless, of course, you are
one of the luck few who have a nice 7000 plug-in extender.)

Also, did you remember to clean all attenuator cam switch contacts with
isopropyl alcohol? This would be the first order of business before
attacking the plug-in with a soldering iron.


dan


Re: 454 fireworks

Sean Turner
 

OK, I have the scope on the bench again for a closer look at all the components in the +75 supply. Obviously I haven't torn it apart to test out of circuit, but now that I tested it again, Q1197 seems to have an emitter-collector short. I don't *think* this would result from how it is connected. Am I missing something?

Looking at the mechanical bits, it looks to me like the power transformer has to be undone to get to nuts that hold the metal part that the pass transistors heat sink to.

Sean

On Mon, Mar 15, 2021 at 03:43 PM, John wrote:


Sean: If Q1197 isn't s/c it's 99% likely the drive circuitry, which at least
is accessible!
John


Re: 7A16A high frequency compensation.

Albert Otten
 

Ah yes, sorry Max, you mentioned both arrows some posts back.
I mentioned calibration of the PG506 since when calibrating the 7A16A you also try to compensate for pulse shape of the PG506.

Albert


Re: Beware of old AntiStatic foam

Dave Seiter
 

I have a number of plastic toy rail cars from the 40's (American Flyer, I believe) that were my fathers, and have a similar problem.  Either the plasticizer or mold release has resulted in white deposits (on both the plastic and metal parts) over the years that also smells like vomit.  Very hard to remove from the plastic.  I too have a set of Xcelite nut drivers that smell "weird".  Not like vomit, and there's no corrosion, but I like to let them air out before I use them.
-Dave

On Sunday, March 21, 2021, 11:49:23 AM PDT, stevenhorii <sonodocsch@gmail.com> wrote:



Another “plastic rot” question. I have a set of Xcelite tools. One of them,
a stubby Philips screwdriver, developed a white coating on it that was
impossible to remove without sanding it off. I could get some of it off,
but it kept re-developing this. None of the other tool handles has done
this. The handles, I believe, are a butyrate plastic that gives off butyric
acid as it oxidizes but they all are and this is the only one that
developed this white coating. The whole tool kit smells rather like vomit
(my wife refers to it as my “vomit tool case”) but this is common with
butyrate plastic-handled tools.


Re: Beware of old AntiStatic foam

Ken, WA2LBI
 

Those tool handles are another issue. I have a plastic fitted case for a
set of Xcelite nut drivers. They have quite an odor. I have to leave the
case open unless I'm traveling away from the workshop. I also have a number
of other tools, mostly screwdrivers, that have the same awful odor. I have
taken to inserting a block of wood in the toolboxes to keep the lids
slightly open so the odor can vent and I'm not blasted with a concentrated
"cloud" when I open the box.

Ken
WA2LBI

On Sun, Mar 21, 2021 at 2:49 PM stevenhorii <sonodocsch@gmail.com> wrote:

I think polyethylene foam instead of the black polyurethane foam does not
have the “get goopy and stick to everything” problem. Has anyone had
polyethylene foam degrade like the black stuff? I have not - either black
or white polyethylene has stood the “test of time”. I have seen foam rubber
turn to dust, but at least it does not (in my experience) get sticky.

Apparently the polyurethane foams also outgas as they degrade and this can
leave deposits on stuff - think camera optics as many camera carrying cases
use polyurethane foam.

If I have some custom-fitted black foam in a transit case, I put the item
in a plastic bag and before putting it back in the case.

Another “plastic rot” question. I have a set of Xcelite tools. One of them,
a stubby Philips screwdriver, developed a white coating on it that was
impossible to remove without sanding it off. I could get some of it off,
but it kept re-developing this. None of the other tool handles has done
this. The handles, I believe, are a butyrate plastic that gives off butyric
acid as it oxidizes but they all are and this is the only one that
developed this white coating. The whole tool kit smells rather like vomit
(my wife refers to it as my “vomit tool case”) but this is common with
butyrate plastic-handled tools.

A comment on Duracell batteries. I am pretty sure there are counterfeits
out there - particularly the “bulk packs” with no Duracell label on the
outside. Here’s an article on fakes:


https://www.thecounterfeitreport.com/product/106/Duracell-Coppertop-AA---AAA-Batteries.html

When I have had Duracell batteries (the AA ones in particular) leak, on
checking, they were the ones I bought in unlabeled bulk packs. I generally
remove batteries from equipment I am not going to use frequently.

Steve Horii

On Sun, Mar 21, 2021 at 12:01 Harvey White <madyn@dragonworks.info> wrote:

As I've mentioned previously, the latest run of Duracell (guaranteed not
to leak before 10 years) does exactly that, and often in the package.

The good news is that they will often give you money to replace the
damaged item if you call them. Their warranty is "repair or replace",
but you do have to call.

I've had the foam in probe cases crumble, (both HP and Tek), anti static
foam corrode and crumble, etc...

Harvey


On 3/21/2021 9:50 AM, David Slipper wrote:
Nasty!! I wonder what other time-bombs are awaiting us!?

I'll certainly be checking my stock of bits and spares.

I always assumed that a famous brand of NiMh batteries were supposed
to be leak proof - Hah! I nearly lost a pair of nice walky-talkies and
a multimeter that way, so now cells get removed from rarely used items
and I make a point of checking torches and the like regularly.

Sadly not surprised at anything these days,
Dave


On 21/03/2021 13:07, - wrote:
Well, this thread just showed up on EEVBlog. This is exactly the
kind of
damage that I used to see happen to IC and to TE accessories that were
stored in the old antistatic foam.

<
https://www.eevblog.com/forum/chat/beware-of-old-antistatic-foam/?topicseen

















Re: Beware of old AntiStatic foam

Dave Seiter
 

Now you have me worried- I have a number of foam-lined trays of PET/CBM-era ICs that I haven't looked at in years.  Fortunately, they are in very dry storage.  One of my "special" chips (a 40 column VIC chip) has been in a conductive rubber socket since the 70's, and I know it's still fine (just checked!)
-Dave

On Sunday, March 21, 2021, 09:57:29 AM PDT, snapdiode via groups.io <snapdiode=yahoo.com@groups.io> wrote:

Yes I've gotten a dozen or so Commodore computer chips damaged that way, I just scraped off the residue with tweezers and hope that there isn't too much chemical residue left for damage to continue.


Re: Beware of old AntiStatic foam

stevenhorii
 

I think polyethylene foam instead of the black polyurethane foam does not
have the “get goopy and stick to everything” problem. Has anyone had
polyethylene foam degrade like the black stuff? I have not - either black
or white polyethylene has stood the “test of time”. I have seen foam rubber
turn to dust, but at least it does not (in my experience) get sticky.

Apparently the polyurethane foams also outgas as they degrade and this can
leave deposits on stuff - think camera optics as many camera carrying cases
use polyurethane foam.

If I have some custom-fitted black foam in a transit case, I put the item
in a plastic bag and before putting it back in the case.

Another “plastic rot” question. I have a set of Xcelite tools. One of them,
a stubby Philips screwdriver, developed a white coating on it that was
impossible to remove without sanding it off. I could get some of it off,
but it kept re-developing this. None of the other tool handles has done
this. The handles, I believe, are a butyrate plastic that gives off butyric
acid as it oxidizes but they all are and this is the only one that
developed this white coating. The whole tool kit smells rather like vomit
(my wife refers to it as my “vomit tool case”) but this is common with
butyrate plastic-handled tools.

A comment on Duracell batteries. I am pretty sure there are counterfeits
out there - particularly the “bulk packs” with no Duracell label on the
outside. Here’s an article on fakes:

https://www.thecounterfeitreport.com/product/106/Duracell-Coppertop-AA---AAA-Batteries.html

When I have had Duracell batteries (the AA ones in particular) leak, on
checking, they were the ones I bought in unlabeled bulk packs. I generally
remove batteries from equipment I am not going to use frequently.

Steve Horii

On Sun, Mar 21, 2021 at 12:01 Harvey White <madyn@dragonworks.info> wrote:

As I've mentioned previously, the latest run of Duracell (guaranteed not
to leak before 10 years) does exactly that, and often in the package.

The good news is that they will often give you money to replace the
damaged item if you call them. Their warranty is "repair or replace",
but you do have to call.

I've had the foam in probe cases crumble, (both HP and Tek), anti static
foam corrode and crumble, etc...

Harvey


On 3/21/2021 9:50 AM, David Slipper wrote:
Nasty!! I wonder what other time-bombs are awaiting us!?

I'll certainly be checking my stock of bits and spares.

I always assumed that a famous brand of NiMh batteries were supposed
to be leak proof - Hah! I nearly lost a pair of nice walky-talkies and
a multimeter that way, so now cells get removed from rarely used items
and I make a point of checking torches and the like regularly.

Sadly not surprised at anything these days,
Dave


On 21/03/2021 13:07, - wrote:
Well, this thread just showed up on EEVBlog. This is exactly the
kind of
damage that I used to see happen to IC and to TE accessories that were
stored in the old antistatic foam.

<
https://www.eevblog.com/forum/chat/beware-of-old-antistatic-foam/?topicseen













Re: Beware of old AntiStatic foam

Dave Seiter
 

A few years ago, I found a very nice set of lab glassware in a fitted case at an estate sale.  When I got home, half the foam had disintegrated into dust from just driving around, and the rest did when I touched it. At least it wasn't gooey!
-Dave

On Sunday, March 21, 2021, 09:01:10 AM PDT, Harvey White <madyn@dragonworks.info> wrote:

As I've mentioned previously, the latest run of Duracell (guaranteed not
to leak before 10 years) does exactly that, and often in the package.

The good news is that they will often give you money to replace the
damaged item if you call them.  Their warranty is "repair or replace",
but you do have to call.

I've had the foam in probe cases crumble, (both HP and Tek), anti static
foam corrode and crumble, etc...

Harvey


On 3/21/2021 9:50 AM, David Slipper wrote:
Nasty!! I wonder what other time-bombs are awaiting us!?

I'll certainly be checking my stock of bits and spares.

I always assumed that a famous brand of NiMh batteries were supposed
to be leak proof - Hah! I nearly lost a pair of nice walky-talkies and
a multimeter that way, so now cells get removed from rarely used items
and I make a point of checking torches and the like regularly.

Sadly not surprised at anything these days,
Dave


On 21/03/2021 13:07, - wrote:
Well, this thread just showed up on EEVBlog.  This is exactly the
kind of
damage that I used to see happen to IC and to TE accessories that were
stored in the old antistatic foam.

<https://www.eevblog.com/forum/chat/beware-of-old-antistatic-foam/?topicseen









Re: Battery holder spring corrosion (was:Re: [TekScopes] Beware of old AntiStatic foam)

snapdiode <snapdiode@...>
 

I think batteries are able to spit out chemicals from their seals as they age. I have this Radio Shack Model 100 portable computer that has extensive (almost not repairable) corrosion near the battery pack, but also has odd single pin corrosion clear across the PCB, the only reasonable explanation is a tiny droplet being spit out the battery seal. It's not just leaking like a slow seeping of fluid across a barrier, I'm guessing there's also times when gas pressure builds up, part of the seal gives, a droplet flies out, the pressure is relieved, the seal forms back, and the cycle slowly continues and might take another year for the next droplet.


Re: Beware of old AntiStatic foam

snapdiode <snapdiode@...>
 

On Sun, Mar 21, 2021 at 11:06 AM, Bert Haskins wrote: Yep they used something like this in drive belts also.

Yes my TEAC X-3 just had a "belt melt", it is hard ti understand why they can't be made in silicone rubber now. That should be practically eternal in comparison to my lifespan....


Re: 7D15 internal trigger not working

Mark Vincent
 

Steve,

If you get the KSP10BU transistors, these have a pinout of BEC. They are not the common EBC or ECB pinout. I suspect all of your 0402 transistors are leaky from what you already checked. Checking them out of circuit will confirm leakage or not. If you want to have some fun, use a battery of 9 or 12V, a series resistor of about 1000 ohms or so and treat the transistor as a diode (E and C used) and see what voltages you get across each device. Reverse the battery connections or E and C connections and see what happens to the voltages across each of the two. This is done with the transistor out of circuit and base not connected.

Mark


Re: Beware of old AntiStatic foam

snapdiode <snapdiode@...>
 

Plastics in general aren't eternal. I have two P6032 probes that are melting and the smell is nauseating. I have to open them up and air them out as soon as I can crack a window open here.


Battery holder spring corrosion (was:Re: [TekScopes] Beware of old AntiStatic foam)

Brad Thompson
 

Renée wrote on 3/21/2021 1:17 PM:

unfortunately I too have had the same experience. foam-lost a bunch of microprocessors and assorted items that I thought were in safe place....
and regarding Duracell---lost a couple pieces of test equip..now this was a long time ago-their answer was "send it in we will fixit"...well I did that with one item and then they said not repairable and it is too old to replace
<snip>

Hello--

Thank you for the heads-up regarding Duracell's discard service [sic].

I've noticed that battery holders for, say, AA cells that feature coil-spring contacts
for the cells' negative ends eventually experience corrosion of the springs, even though
there's no sign of leakage from the cells. This occurs when manganese-alkaline cells are used
and it doesn't appear to be brand-related..

This may be related to "black wire disease"...

http://www.hangtimes.com/black_wire_disease.html

...But that phenomenon seems to relate to NiCd cells and not alkaline cells.

Is there a corrosion chemist in the house?

73--

Brad  AA1IP


Re: OT: MC12080 prescaler chip weirdness

Michael Dunn
 

Maybe I'll try pre-baking the next one also. I've read claims that it's unnecessary for hand soldering, but...


Re: Beware of old AntiStatic foam

Bert Haskins
 

On 3/21/2021 12:18 PM, Ken, WA2LBI wrote:
That old foam is awful stuff. I’ve had headphone head bands and ear pads
crumble to dust. I’ve also lost ICs that were pressed into the foam.
Foam-lined storage cases have damaged or destroyed stored items. Old
microphone inserts become dust. There are many other examples...

A few years ago, after many leaking batteries - some still new in the
package, I removed every Duracell battery from every device I own. I’ve
lost a number of flashlights, kid’s toys, remote controls, etc. The worst
is the damage done to my electronic test gear. I switched to Energizer and,
since then, have not had a single device device damaged by battery leakage.

The other item to check is the stick on feet used on so much equipment. As
we know, they turn to a slimy, sticky mess that also gets on the adjacent
surface and is difficult to remove. At the very least, over time, they
“migrate” from their original position and leave a slimy trail.

<rant off>

Ken
WA2LBI
The one I really remember is a "Pyle Driver" speaker that used some sort of a foamy glop to anchor the speaker cone.

I really liked this speaker because it had a nice upper mid range presence but then one day I plugged in my guitar and was greeted to some really awful sounds.

The speaker cone had totally come off the frame and there was no sign of the glop.

They are still selling this brand of speakers, I can't begin to guess how they got away with it.

" As we know, they turn to a slimy, sticky mess" Yep they used something like this in drive belts also.

And the very worst one is a black semi hard foam that was used in boat fuel lines!
Over the years this stuff would shrink, become tight and then break.
In many cases the fuel line burned up in the resulting fire so the true cause was never known.

- Bert




On Sun, Mar 21, 2021 at 12:01 Harvey White <madyn@dragonworks.info> wrote:

As I've mentioned previously, the latest run of Duracell (guaranteed not
to leak before 10 years) does exactly that, and often in the package.

The good news is that they will often give you money to replace the
damaged item if you call them. Their warranty is "repair or replace",
but you do have to call.

I've had the foam in probe cases crumble, (both HP and Tek), anti static
foam corrode and crumble, etc...

Harvey


On 3/21/2021 9:50 AM, David Slipper wrote:
Nasty!! I wonder what other time-bombs are awaiting us!?

I'll certainly be checking my stock of bits and spares.

I always assumed that a famous brand of NiMh batteries were supposed
to be leak proof - Hah! I nearly lost a pair of nice walky-talkies and
a multimeter that way, so now cells get removed from rarely used items
and I make a point of checking torches and the like regularly.

Sadly not surprised at anything these days,
Dave


On 21/03/2021 13:07, - wrote:
Well, this thread just showed up on EEVBlog. This is exactly the
kind of
damage that I used to see happen to IC and to TE accessories that were
stored in the old antistatic foam.

<
https://www.eevblog.com/forum/chat/beware-of-old-antistatic-foam/?topicseen
--
Ken
WA2LBI

Sent from one of my mobile devices



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