[AMRadio] glueing ceramic

[Kim Elmore]

Be cautious with epoxies: I know form experience that some tolerate heat 
very well while others do not. If this is anyplace that will get hot, 
due to (for example) IR radiation from a 3-1000Z (in long winded AM 
service), it may get quite hot. Epoxies work well with both porous and 
non-porous materials.

Gorilla glue is a polyurethane and extremely strong but tends to foam-up 
as it cures, which can push the parts apart and screw up your alignment. 
JB Weld is nothing more than a filled epoxy, though there may be 
versions made for high-temperature service. Cyanoacrylate glues (Crazy 
Glue and the like) are very strong and some (not all) are  
heat-tolerant, but need very clean joints and work best with non-porous 
materials. Any oils left on the mating surfaces will severely degrade 
the joint. Denatured alcohol is your best buddy for any surface 
preparation. White glues (Elmer's and Titebond) aren't nearly as strong 
as the others but work well on porous surfaces. The epoxies and 
polyurethanes are extremely resistant to any solvents; cyanoacrylate is 
soluble in (I think) toluene, and the white glues are soluble in water.

Personally, I'd go with an epoxy with a long (24 h) cure because that 
gives it a chance to migrate into any pores and form a good bond.

Kim N5OP


On 8/25/2013 5:36 AM, w5sum wrote:
> I recently received a B&W CX96C Butterfly Variable in the mail with the front ceramic or porcelin bar broken in one place. Its a clean break with no splintering and the pieces will fit back tobether tightly.
>
> What kind of glue have you fellows had success with glueing something like this that is porous?
>
> thanks in advance & God bless
>
> Ronnie
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