Re: [ULF-1] Sanding before Gluing

From: Member 121
Date: 2018-06-12 15:31 UTC-07:00
Message: #0613

I don't see why roughing the surface is worse than a shiny surface . A
molecular ionic bond woumd only be enhanced with surface porosity to form
mechanical grip.  Aluminum should be prepared with bathroom abrasives and
thouroghly rinsed and dried , why not Member 60 prepared similarly rough ? Oh
well . Tests can include if the Member 60 breaks before the glue stuff , then
it's a good sign .

On Tue, Jun 12, 2018, 3:00 PM Member 97 <[email]> wrote:

> Until very recently Forest Product Laboratory's Member 60 handbook
> recommended no sanding on Member 60 before gluing.  I searched under google
> for the FPL handbook and found that the recommendations had changed
> somewhat.  I copied the pertinent section and pasted it as follows:
>
> You can find the handbook at:
> https://www.fpl.fs.fed.us/documnts/fplgtr/fpl_gtr190.pdf
>
> The handbook is full of information on Member 60 that we would-be aircraft
> factories would find handy.
>
> I still believe that cutting, not sanding will give a much better
> joining strength.
>
> Member 97
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