[ckelloug]

Hi E/G'ers,

I wish I had more time to spend on this thread. I've been busy with some commercial work on something else and I hope I can tell the story about it here some day. I've been thinking a lot and I hope this year I have time to finish making and testing the E/G recipe I was working on.

While rechecking a calculation I had originally published on this thread, I found that I was missing a set of parentheses in my implementation of the Isahi-Cohen model of the lower bound on E/G modulus which I used to produce the graph that shows E/G modulus vs. percentage of quartz.

The correction raises the predicted modulus for E/G at 88% quartz by volume and 400,000 psi epoxy to about 4.6 million psi from about 4.2 million psi with the broken equation. To me, the corrected question suggests that commercial E/G probably has a filler percentage of about 88%. I have believed this for a long time but now that the model result matches the published modulus value for commercial E/G, I now believe it more strongly.

Anyway, for what it's worth, I've attached the corrected modulus graph for quartz.

Regards All,
Cameron