Does ammonia fuming raise the M.O.E. or. M.O.R. ?

[Yellowstave]

Has anyone done a bend test on ammonia fumed wood vs untreated wood from the same piece?

[Jim Davis]

Doubt that anyone has done that test. You might contact the Forest Products Laboratories. They have done  some testing  of the effect of modifications to wood.

But, you could easily do practical  test. Anchor on end of a slat and  see how far it bends under a particular weight from which  it returns to its unweighted position when  the weight is removed. Fume the slat and see if there  is any change in the bend with the same weight.

Hard to imagine there would be much difference.

[Del the cat]

First rule of writing... acronyms should be written in full where they first appear. 
Del

[Yellowstave]

Sorry I'm not a writer. I figured if someone one here didn't know what modulus of elasticity and modulus of rupture was than they probably couldnt answer the question anyway. Again my bad.

[leonwood]

I have not done any specific bend tests but I have fumed a lot of bows and have never noticed any difference in performance, amount of set or draw weight before or after fuming

[Yellowstave]

I think it would be interesting to see with a controlled experiment. I'm very curious about it. I have however noticed that if I have a bow thats taking set and I apply wood hardener to the belly then the set is reduced by a substantial amount. That is one reason that I started to wonder about this. Thank you all. I will get some 30 percent ammonia and try this in the near future. I plan on fuming for 10 days or so.

[PatM]

 Pretty easy to find tests done on this.  The ammonia treatment is likely a bit different from a home done version.
 
    ht tps://scielo.conicyt.cl/pdf/maderas/v15n3/aop2913.pdf

[Yellowstave]

I'm not most savvy researcher I know, but I have looked at all I know to look at and cant hardly find anything on a definitive test. That's why I pose the question here. I figure that there is no better spot in the world than right here to pick experienced bowyers minds. Thanks again for thoughts.

[PatM]

The test linked to shows negligible effect in Oak sapwood and a fairly significant increase in Heartwood.

 In typical bow woods using heartwood it tends to be stronger and more elastic anyway.

 Quite a few guys have treated wood with ammonia so they could tell you if it seems to make a difference worth doing for more than re-shaping and adding color.

[DC]

I've fumed a couple of bows and never noticed any difference once the wood has dried. I have read that ammonia is mixed with the steam water to limber up wood that is being steamed.