Hello
I have some ball bearing assemblies that need to be put together with
Loctite , will probably use Loctite No. 271 as it is available locally ,
problem is they recommend using the 7471 Cleaner Accelerator and it's very
expensive to get it shipped in and not found locally , they sometimes refer
to it as Acetone but it can't be that as the stuff is very expensive , shelf
life of these products is only a year or so , wonder if anybody has found
something that is available and cheap that will work for Cleaner /
Accelerator for Loctite.
Thanks
Phil L.

On Sat, 13 Oct 2007 15:12:25 -0400, Phil wrote:

Hello
I have some ball bearing assemblies that need to be put together with
Loctite , will probably use Loctite No. 271 as it is available locally ,
problem is they recommend using the 7471 Cleaner Accelerator and it's very
expensive to get it shipped in and not found locally , they sometimes refer
to it as Acetone but it can't be that as the stuff is very expensive , shelf
life of these products is only a year or so , wonder if anybody has found
something that is available and cheap that will work for Cleaner /
Accelerator for Loctite.


Well, acetone will certainly clean metal! But I don't know about
the "accelerator" properties.

Good Luck!
Rich

On Sat, 13 Oct 2007 15:12:25 -0400, Phil wrote:

Hello
I have some ball bearing assemblies that need to be put together with
Loctite , will probably use Loctite No. 271 as it is available locally ,
problem is they recommend using the 7471 Cleaner Accelerator and it's very
expensive to get it shipped in and not found locally , they sometimes refer
to it as Acetone but it can't be that as the stuff is very expensive , shelf
life of these products is only a year or so , wonder if anybody has found
something that is available and cheap that will work for Cleaner /
Accelerator for Loctite.

Maybe the "active ingredient" is the 2-Mercaptobenzothiazole
http://rshughes.com/images/products/...N2rzTWeP_Q.pdf

Cheers!
Rich

According to Phil :

[ ... ]

problem is they recommend using the 7471 Cleaner Accelerator and it's very
expensive to get it shipped in and not found locally , they sometimes refer
to it as Acetone but it can't be that as the stuff is very expensive , shelf
life of these products is only a year or so ,

Note that a Loctite representative who was giving a talk to our
metalworking club was asked about the shelf life, and how long it
*really* would last.

He explained that the shelf life on the products could be blamed
on the GSA (Government Supply Agency) who does all the purchasing for
the army, navy, air force, marines, and civilian branches of the
Government. They *insist* on there being an expiration date, because
their inventory system requires it. After the expiration date is
reached, large quantities are shipped back to Loctite to be re-certified
with a new expiration date. Individuals (not "blessed" with an
inventory system) are free to ignore the expiration date.

Now -- I could believe that the cleaner part might well be
acetone (though the spray can which I have does not *smell* like it) and
normally the presence of metal ions is what starts it curing. I believe
that the accelerator has some metal ions added to start it curing on
things which don't have metal ions -- such as plastics.

Good Luck,
DoN.

--
Email: | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---

DoN. Nichols wrote:
....
He explained that the shelf life on the products could be blamed
on the GSA (Government Supply Agency) who does all the purchasing for
the army, navy, air force, marines, and civilian branches of the
Government. They *insist* on there being an expiration date, because
their inventory system requires it. After the expiration date is
reached, large quantities are shipped back to Loctite to be re-certified
with a new expiration date. ...

That doesn't seem quite right. Why don't they just put a 20 year life
on it? So they can get paid to re-certify it? Then why don't they put
a 1 month life on it? Just doesn't seem quite right.

Bob

According to Bob Engelhardt :
DoN. Nichols wrote:
...
He explained that the shelf life on the products could be blamed
on the GSA (Government Supply Agency) who does all the purchasing for
the army, navy, air force, marines, and civilian branches of the
Government. They *insist* on there being an expiration date, because
their inventory system requires it. After the expiration date is
reached, large quantities are shipped back to Loctite to be re-certified
with a new expiration date. ...

That doesn't seem quite right. Why don't they just put a 20 year life
on it? So they can get paid to re-certify it? Then why don't they put
a 1 month life on it? Just doesn't seem quite right.

The two year life is apparently the longest that the GSA system
will accept for fluids of this sort. I wonder what kind of expiration
date they put on oils? A friend has a really old Navy can of drinking
water. I wonder what kind of expiration date they would put on it these
days?

No need to try to explain that with the greed of the companies
like Loctite -- when it is quite adequately explained by the stupidity
of bureaucracy. :-) (Having worked (as a civilian) for the Army for
nearly thirty years, I've seen enough of that to believe it all.

Enjoy,
DoN.

--
Email: | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---

They *insist* on there being an expiration date,

The two year life is apparently the longest that the GSA system
will accept for fluids of this sort.

LocTite 7471 composition and expiration

http://tds.loctite.com/tds5/docs/7471-EN.pdf

The tech data sheet is there for those who might want it. Acetone is a
large
part of the mix; there is also isopropyl alcohol, plus the active
amine and thiazole
components. Solvents for cleaning, the amine/thiazole for curing kick.

Ellsworth and RS Hughes show small containers as available (1.75 oz.),
~$13-14.

Personal experience: The 7471-T primer has a large effect on the
curing process,
especially where the items being bonded are less chemically active,
such as in
the case of alloy/stainless steels. In the presence of bare aluminum
or brass, this
primer will sometimes cause such rapid curing you can't finish the
assembly. In
the case of less reactive materials, it will enable a far better cure
than you might
otherwise achieve. Much depends as well on the adhesive agent being
used with
the primer. I was assembling a threaded retainer made from brass onto
anodized
aluminum (32 TPI, ~1.5" dia), cleaned/primed both parts, applied one
of the 600
series bearing retainer compounds, screwed them together, and the
parts locked
up after 1 1/2 turns. The fit was great when I dry-threaded them...

The expiration dates in general on catalysts and curing agents should,
at the least,
be considered. The closer you are to the expiration date, the more the
need for a
test bond. If the curing agent has complicated chemistry as well, such
as in the
case of some RTVs for potting, ignore the expiration date at your
peril. Disasters
will absolutely occur. Been there....

Matt

I seem to recall reading some time ago on the LOCTITE website that the
use of cleaner/accelerator WEAKENS the ultimate strength of the bond.
This was in the context of repairing a small built-up crankshaft.

Something to consider if you are trying to transmit appreciable torque
through the joint.

Wolfgang