Re: Clean(ing) connections

[the pickle]

Hrmor you could just soak in a vinegar-salt solution, which cleans up
contacts just as well as HCl or phosphoric acid without any of the hazmat
cleanup in the case of a spill, and is much more easily obtainable and less
harsh on the contacts.  Oh, and no rinsing off Coke residue ;)
-- 

the pickle

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Re: Clean(ing) connections

[PeterH5322]

In a message dated 12/9/02 10:51:24 PM, [EMAIL PROTECTED] writes:

<<
... I'm glad the Naval Jelly worked well for you, but I've gotta add my two 
cents worth.  If you only have a small amount of oxidation on your connectors 
one of the best ways to clean it without damaging the cables/connectors is to 
soak the offending area in Coca-Cola over night ...
>>

The "active" incredients in both Naval Jelly and CocaCola is phosphoric acid.

For electronics applications, it's best to use a purpose-made deoxidizer, and 
follow it with a purpose-made protectant. Deoxit, etcetera.


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Re: Clean(ing) connections

[David Culler]

greatful wrote:

> Subject: Clean(ing) connections
>
> >Picked up a small, yet wonderfully eclectic, lot of SCSI cables [snip] noticed some 
>[snip] reddish/brown, granular...
> >
>
> A big Thank You to David Wood for confirming a suspicion (and providing confidence) 
>to try Naval Jelly ~ worked like a charm!!!
>
> greatful

greatful,

I'm glad the Naval Jelly worked well for you, but I've gotta add my two cents worth.  
If you only have a small amount of oxidation
on your connectors one of the best ways to clean it without damaging the 
cables/connectors is to soak the offending area in
Coca-Cola over night.  Then rinse well with clear water and dry thoroughly.  The small 
amount of HP3O4 in the soft drink (along
with the carbonic acid found in there as well) will remove the oxidation.

Naval Jelly will clean the metal very well but it will also attack good metal so the 
parts should not stay in the solution any
longer than is necessary.  Naval Jelly's primary ingredient is Phosphoric acid but it 
is in a much higher concentration than in
your Coke.  Also, Naval Jelly leaves a phosphate coating behind that protects the 
steel, but is very bad for any plating on the
surface. This coating is a by product of the chemical reaction created by the acid.  
Many connectors are plated to improve
conductivity and Phosphoric will remove or convert most platings, except for gold of 
course.

You can get basically the same effect by using muratic acid, the kind sold in paint 
stores for etching concrete.  Dilute it about
4:1.  Muratic acid is another name for plain old HCl (hydrogen chloride or 
hydrochloric acid), although reagent grade HCl is 37%,
muratic acid tends to be much less concentrated.  Be warned, HCl can cause severe eye, 
skin and respiratory irritation and
inhalation of about 1500 ppm in air is fatal.  Also, getting HP3O4 on your skin or in 
your eyes is no picnic either.  Naval Jelly
is thicker than HCl and therefore takes longer to wash off which means it has more 
time to do damage.

When using any acetic or caustic chemicals for cleaning be sure to rinse very 
thoroughly afterwards to remove all traces of the
chemicals or they will slowly continue to eat away at the metal

Once the metal is cleaned it is best coated with something to prevent further 
oxidation.  It has been my experience that coating
the metal with n-propal or Iso-propal alcohol to remove any residual water and oil, 
warming with a hair dryer or heat gun on low
settings (being sure not to ignite the fumes) to remove the alcohol and then coating 
the contacts with polyphenyl ether will
provide excellent protection and maximum connectivity.  A good source of polyphenyl 
ether is a product called Gold Guard marketed
by Chemtronics.

Okay, why is there phosphoric acid in soft drinks you want to know?  It is used as a 
buffer to keep the pH low which enhances
flavor and tartness.

Class dismissed,

David Culler


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Re: I'm looking to buy a used PowerBook (Toronto area only please)

[J Sand]

>Can someone *please* explain how this is even remotely related to 
>68040-based
>Macs?
>
>Yeah, I didn't think so.
>--
>
>the pickle
>
Yeah, the student probably does not know the difference between them.  Give 
him a break Pickle.  He just knows that we discuss macs here I bet. (But 
then I could be very wrong in my observation!)

John

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Re: I'm looking to buy a used PowerBook (Toronto area only please)

[the pickle]

At 00:57 -0400 on 10/12/02, Gary wrote:

>I'm looking to buy a used PowerBook, low-end of G3's minimum if possible or
>equivalent (603's), sufficient enough to browse the web, for e-mailing and
>word-processing... I would like to do graphics too for my website but I
>won't be doing powerful heavy-duty graphics works... I can spend up to $500
>Canadian
>Dollars (sorry I'm on a tight budget.. I'm only a student)...  Toronto-area
>(Canada) only please. Please e-mail me at [EMAIL PROTECTED]    Thanks.

Can someone *please* explain how this is even remotely related to 68040-based
Macs?

Yeah, I didn't think so.
-- 

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I'm looking to buy a used PowerBook (Toronto area only please)

[Gary]

I'm looking to buy a used PowerBook, low-end of G3's minimum if possible or 
equivalent (603's), sufficient enough to browse the web, for e-mailing and 
word-processing... I would like to do graphics too for my website but I 
won't be doing powerful heavy-duty graphics works... I can spend up to $500 
Canadian
Dollars (sorry I'm on a tight budget.. I'm only a student)...  Toronto-area
(Canada) only please. Please e-mail me at [EMAIL PROTECTED]    Thanks.
-
from: Gary
[EMAIL PROTECTED]

*** Please turn off HTML in your mail client. I can read text-only 
messages. ***


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Re: Clean(ing) connections

[greatful]

-Original Message-
Date: Thu Dec 05 12:12:40 PST 2002
Subject: Clean(ing) connections

>Picked up a small, yet wonderfully eclectic, lot of SCSI cables [snip] noticed some 
>[snip] reddish/brown, granular...
>

A big Thank You to David Wood for confirming a suspicion (and providing confidence) to 
try Naval Jelly ~ worked like a charm!!!

greatful

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