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Scotchbrite

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jeffrey_davidson(at)earth
Guest

Posted: Sun Feb 12, 2006 9:55 am Post subject: Scotchbrite

Any chance of reserving all future discussions of the green

variety of scotchbrite for the upcoming St. Paddy's Day? 



While I agree that the Scotchbrite discussion has had its funny moments, at

the core of the concern is the fact that ZAC considered there to be enough

of a concern to bring it to everyone's attention.  Believe me, just mention

corrosion protection in general and the discussion among builders will take

off almost anytime.  It is something of concern to most of us.  For those of

us who are not as well versed in metallurgy, we don't know what to be

concerned about and what to ignore.  Paint preparation is also a concern for

those of us that don't paint for a living.  For those that might have used

the "wrong" Scotchbrite, I can guarantee you that this is a real concern.

At least now there is a little better understanding of what the concern is.

Namely, the abrasive should be aluminum oxide.  Hopefully that will be the

answer that sticks over time.



I apologize in advance for the "lecture".



Jeff Davidson

jhstarn(at)verizon.net
Guest

Posted: Mon Feb 13, 2006 8:54 am Post subject: Scotchbrite

Please, don't back off now. The lists are also to lighten us up, push us 

onward and get us in the air. Do Not Archive & trimming also helps.

Below is a copy of Matt instructions to use the list(s).   KABONG   8*)



List Policy Statement

      The purpose of the List is to provide a forum of discussion for

      things related to this particular discussion group.  The List's goals

      are to serve as an information resource to its members; to deliver

      high-quality content; to provide moral support; to foster camaraderie

      among its members; and to support safe operation.  Reaching these 

goals

      requires the participation and cooperation of each and every member of

      the List.

To "foster camaraderie among its members" is IMNSHO (In My Not So Humble 

Opinion) the most important of all, if you act in manner to do this 

everything else is automatically included.

---

LRoss(at)cngmail.com
Guest

Posted: Mon Feb 13, 2006 4:03 pm Post subject: Scotchbrite

Yes my statement on brooms and dishwashing gloves was in no way intended as

a flame on the original post or the importance of the discussion I was just

trying to lighten the mood. If I offended in anyway I'm truly sorry

Lee Ross

--

n4546v(at)mindspring.com
Guest

Posted: Tue Feb 14, 2006 9:00 am Post subject: Scotchbrite

Hello Listers:

    If it is unacceptable to allow iron rich Scotchbrite (if there is such a

thing) near aluminum, why are we permitted to use drill bits, shears, snips

& files, most of which are iron based?



Regards,



Randy, Las Vegas do not archive

crvsecretary(at)aol.com
Guest

Posted: Tue Feb 14, 2006 9:31 am Post subject: Scotchbrite

Hi Randy:

 

Abrasives are wonderful things.  Think of a grinding wheel: the cutting action is created not by the texture of the surface but by the 'cracking'  of the crystals that the wheel is made of, thus exposing new, sharp cutting edges.  If the wheel is too hard, the crystals will not crack and it will load up; if too soft it will turn to dust as you grind.

 

OK, so now back to the Dreaded Silicon Carbide Schtchbrite...or any other silicon carbide abrasive product (like wet & dry 'sandpaper').  Some of the abrasive grit will fracture from the abrasive cloth (or pad) and will be left behind on the work.  This is the bad thing we try to avoid - dissimiliar metals and corrosion.

 

Cutting tools like drill bits, shears, files etc. leave no residue.

 

Great question !!!!!

 

Regards,

 

Tracy Smith

N458XL (reserved)

do not archive

 

--

gboothe(at)calply.com
Guest

Posted: Tue Feb 14, 2006 7:07 pm Post subject: Scotchbrite

That's why I use tools only from China. They have a minimum amount of iron!



Gary Boothe, Cool, Ca

<gboothe(at)calply.com>

601HDSTD, WW Corvair Conv. - complete

Tail Group - complete. Working on Wings...

DEFINITELY DO NOT ARCHIVE



---

Doug Garrou

Joined: 16 Jan 2006
Posts: 18
Location: Richmond, VA, USA

Posted: Wed Feb 15, 2006 7:14 am Post subject: Scotchbrite

To recap the bidding (a.k.a. "flail the dead horse to a pulp suitable for use as McDonald's burgers"):  



I think we've now established that "iron rich Scotchbrite" is a complete and total figment of the web.  This is actually a very useful finding, in my view!



Meanwhile, to my knowledge, no one has demonstrated that the use of any abrasive of any kind has ever been the proximate cause of any corrosion in any aluminum aircraft.  Not saying it can't happen or hasn't happened -- I suspect it actually can and does -- just saying I still haven't seen it. 



Maybe if you rubbed alclad aluminum sheet with rusty steel wool impregnated with road salt and bird guano....



Note that there was one claim of Scotchbrite-induced corrosion, with photos, but it turned out to be filiform (sp?) corrosion traceable to other sources.



Doug Garrou

Project 801

www.garrou.com

do not archive, I beg you



--

n4546v(at)mindspring.com
Guest

Posted: Wed Feb 15, 2006 9:20 am Post subject: Scotchbrite

"Cutting tools like drill bits, shears, files etc. leave no residue."



Hello Tracy:

    While I agree with most of your post, if the above were absolutely true,

cutting edges on drills etc. would never wear and would stay sharp forever.

Cutting edges wear, leaving that amount of metal somewhere.  Granted, tools

are very long lasting cutting Aluminum, and leave nowhere near the debris

that abrasives do, but they do leave some.  Carpenter Steel points out in

their Stainless Steel guides that when a complaint comes in from the field

that a machined stainless steel part is rusting, the first thing to ask is

if the rust is occuring in a area that has been machined.  That is usually

the case and the cause is microspopic residue from the STEEL cutting tool,

i.e. end mill, that was used to machine the stainless part is present and it

is that material that is rusting on the surface, not the stainless steel

itself.  I manufacture certain parts from 303 stainless, and I have

experienced the above.



Thanks to Doug for confirming that "iron rich Scotchbrite" is now part of

the lexicon.



Best Regards,



Randy L. Thwing, Las Vegas

do not archive

crvsecretary(at)aol.com
Guest

Posted: Wed Feb 15, 2006 9:38 am Post subject: Scotchbrite

Hello Randy: 

 

You are absolutely right and I should not speak in absolutes, as in "leave NO residue" (emphesis mine).

 

However, I was speaking about residues that would make a material difference in the work.  In machining stainless, microscopic residue from the HSS tool WILL make a difference; but in our little aluminum airplanes the residue from a HSS drill is absolutely insignificant.  The experts caution us the volume of residue from a silicone carbide abrasive is truely a potential corrosion hazard.

 

Thanks for the correction, Randy.

 

Tracy Smith

N458XL (reserved)

do not archive

 

--

bjohnson(at)satx.rr.com
Guest

Posted: Wed Feb 15, 2006 10:22 am Post subject: Scotchbrite

Which DOES mean, the type "S" scotchbrite should be avoided right??? 



-Bruce Johnson (who polished parts of his 6061T-6 Sonex spar with silicon

carbide laced "TYPE S" scotchbrite  )



[quote] --

cfd(at)thegateway.net
Guest

Posted: Fri Feb 17, 2006 1:44 pm Post subject: Scotchbrite

To really get the story straight, I asked 3M about ScotchBrite, their

answer:



The green Scotchbrite (#74)contains approximately aluminum oxide mineral

(220x to 320x) that is resin bonded to the nylon fibers.  It will cut most

surfaces including aluminum.



Other Scotchbrite



S ULF, S VLF and S MED use silicon carbide, the others use aluminum oxide.



Light Duty Cleansing Pad 7445  048011-16976-7 - white -

Ultra-Fine Hand Pad 7448   048011-04028-8 - gray S ULF

General Purpose Hand Pad 7447  048011-04029-5 - maroon A VFN

Production Hand Pad 8447  048011-24037-4 - maroon A VFN

Blending Hand Pad 7446   048011-04051-6 - gray S MED

Heavy Duty Hand Pad 7440  048011-04050-9 - tan A MED

Multi-Flex Abrasive Sheet   051131-07521-4 - dark maroon A VFN

051131-07522-1 - gray S ULF

051131-07523-8 - gold A ULF

Wood Finishing Roll 7745   051131-07745-4 - gold -

Clean & Finish Roll   048011-00264-4 - maroon A MED

048011-00265-1 - maroon A FIN

048011-00266-8 - maroon A VFN

048011-00270-5 - gray S VFN

048011-00274-3 - maroon A MED

048011-00275-0 - maroon A FIN

048011-00276-7 - maroon A VFN

Scrubbing Sponge 74   048011-20688-7 - green - -



Chuck D.

N701TX

Larry Portouw

Joined: 10 Jan 2006
Posts: 17
Location: Sierra Vista/Ft. Huachuca, AZ

Posted: Sat Feb 18, 2006 1:35 am Post subject: Scotchbrite

What's that I hear on this thread?- Crickets chirping? I look forward for

the decrease in email volume with the death of this one. 



This is a great reference and is a keeper. I've added this to my build

reference folder. Thanks, Chuck!



 



Larry Portouw



601XL horiz stab



Atlanta, GA



 



do not archive



 



 

Time: 



01:44:01 PM PST US



 



From: 



"Chuck Deiterich" <cfd(at)thegateway.net>



      Cc: "Vossman, Bob & Nancy" <bnvoss(at)pgrb.com>



Subject: 



Re: RE: Scotchbrite



      

      

<cfd(at)thegateway.net>

      

      To really get the story straight, I asked 3M about ScotchBrite, their

      answer:

      

      The green Scotchbrite (#74)contains approximately aluminum oxide

mineral

      (220x to 320x) that is resin bonded to the nylon fibers.  It will cut

most

      surfaces including aluminum.

      

      Other Scotchbrite

      

      S ULF, S VLF and S MED use silicon carbide, the others use aluminum

oxide.

      

      Light Duty Cleansing Pad 7445  048011-16976-7 - white -

      Ultra-Fine Hand Pad 7448   048011-04028-8 - gray S ULF

      General Purpose Hand Pad 7447  048011-04029-5 - maroon A VFN

      Production Hand Pad 8447  048011-24037-4 - maroon A VFN

      Blending Hand Pad 7446   048011-04051-6 - gray S MED

      Heavy Duty Hand Pad 7440  048011-04050-9 - tan A MED

      Multi-Flex Abrasive Sheet   051131-07521-4 - dark maroon A VFN

      051131-07522-1 - gray S ULF

      051131-07523-8 - gold A ULF

      Wood Finishing Roll 7745   051131-07745-4 - gold -

      Clean & Finish Roll   048011-00264-4 - maroon A MED

      048011-00265-1 - maroon A FIN

      048011-00266-8 - maroon A VFN

      048011-00270-5 - gray S VFN

      048011-00274-3 - maroon A MED

      048011-00275-0 - maroon A FIN

      048011-00276-7 - maroon A VFN

      Scrubbing Sponge 74   048011-20688-7 - green - -

      

      Chuck D.

      N701TX

_________________
Larry Portouw
601XL Kit (H. Stab) (on hold)
PA-22 N8141C<< This project now taking all my time.
Fort Huachuca, AZ

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