Retaining Compounds - part 2


I got the Permatex version of Loctite 660 yesterday (Permatex 20297). Before
I used it in anger I thought I would run a trial.
First of all I opened the 6 ml tube and found it empty! There was about 0.25
ml of the compound in it, enough to use it in the trial - just.
I drilled and reamed three identical blind holes in scrap mild steel: 0.25"
diameter, 0.382" deep. The ideal surface area of contact is 0.35 in2.
I cut three identical pieces of 0.25" uncoated mild steel rod (the actual
diameter 0.247"). I bent them at right angles at the same spot to give me
"twisting handles" for later. I cleaned the rods and the holes with acetone.
I applied the 20297 generously to one of the rods and to the walls of the
hole as far as possible and inserted the rod fully. I did the same with the
second rod using Loctite 262 threadlocker and JB Weld in the third hole.
After 22 hours, these were the results:
1) The 20297 could be easily popped and twisted by hand.
2) Neither of the remaining rods could be twisted by hand.
3) Using a 26" iron pipe with a 0.25" opening in one end as a lever I was
able to move both remaining rods.
4) The JB Weld popped suddenly. After this pop the rod could be moved by
hand.
5) The 262 rod could be moved with some effort. However, there was no
"popping" (catastrophic failure) and even after the rod was rotated for some
distance using the pipe it still could not be moved by hand.
Comments:
1) I do not know what conclusions can be reached from this test about the
20297. Who knows what was in that tube and how it deteriorated over time.
2) In some applications the mode of failure of the 262 may actually be
preferable to the JB Weld which is commonly used in the automotive community
as a retaining compound.
3) Given the small area of contact the strength of the 262 seems quite good.
My totally unscientific impression is that it required somewhat more
strength to rotate the rod held by it than to cause the failure of the JB
Weld. This is consistent with the figures each company publishes for their
respective products.
Conclusion:
There is no desperate hurry to replace the 262 in my applications for the
time being.
Reply to
Michael Koblic
Loading thread data ...
Did you give the acetone time to completely evaporate? It may have had some effect on the material you were using.
Paul
Reply to
co_farmer
[...]
It evaporates in seconds especially this small quantity. However, I routinely wipe dry anyway as acetone sometimes leaves a residue. Anyway, all three sites were treated exactly the same way.
Reply to
Michael Koblic
========== As an alternative take a look at
formatting link

-- Unka George (George McDuffee) .............................. The past is a foreign country; they do things differently there. L. P. Hartley (1895-1972), British author. The Go-Between, Prologue (1953).
Reply to
F. George McDuffee
This is for screws only or did I misunderstand?
Reply to
Michael Koblic
If you are making the threaded holes, you can use their taps to use this method:
formatting link
They also have coil inserts:
formatting link
system works pretty well, but you still have to make sure to torque the screw correctly for it to work.
For removeable threadlocking, I like Vibra-Tite Original:
formatting link

Reply to
anorton
What is it with this Outfit? I get about a 5 sec view of a page then it goes to a blank page, the outline of sorts with nothing on the page. Some fancy crap no doubt but I don't see a thing. :-( ...lew...
Reply to
Lewis Hartswick
Nothing of that sort happens to me. I am using latest firefox. Have you scanned for viruses and spyware?
Reply to
anorton
[ ... ]
Well ... you should mention what OS and browser are involved when you report things like this. Based on the headers in your article, it is a version of Windows, and Mozilla as a browser.
Anyway -- with Opera as a browser, Sun's Solaris 10 as an OS, I get no problems with my default settings which turn off javascript and flash.
If I turn on JavaScript, I get a blank and a redrawing of the page after perhaps fifteen or twenty seconds without any more problems.
I did not bother to turn on Flash so I don't know what contributions it may make.
But I would suggest you try viewing the page with JavaScript disabled -- at least for that page.
Enjoy, DoN.
Reply to
DoN. Nichols
If you have Javascript turned off, you'll miss most of the page.
-- Some people hear voices. Some see invisible people. Others have no imagination whatsoever.
Reply to
Larry Jaques

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.