To answer the question "Is this Ebonite" we must look at what is ebonite. Ebonite is made from dust and dust we shall see when turned. Ebonite is also extruded among other things, so that should show up good in the photo details below.
After we answer that topic question I shall follow up with "if not ebonite then what is it?"
:Smell and visual:
As I opened the shipping package today I took good note of what it smelled like. I have a very good sense of smell and this did not smell like any ebonite that I have smelled before. This may not mean it's not ebonite but it did rule out many types of ebonite.
Here we see a side by side shot of the mystery blank (left) and black Nikko ebonite (japanese) (right), also the very end right is Marine blue NYH Ebonite (german)
First thing to note, the banding marks on the left block. Looks like there was a layer of one material with grain direction in a slant was pressed to another layer of same or similar dyed material but grain direction was different, thus creating a hatch pattern.
The banding is from being turned. It was only present on the red block.
Note the ebonite on the right, it looks sandy. It actually looks like dust was heated up, pressed together and forced into a specific shape. (which is how it is made)
:End Grain:
First thing we noted was visually could not see much out of the ordinary. However, the macro lens sure did pick up a great number of things.
The circled areas are cracks. What is interesting to note here is the growth of the crack, note how irregular it is and how it weaves along the laminate union. Upon closer inspection we see a good number of them as in the second pic.
:Lathe testing:
I took each section, the red, one ebonite and one pen blank that I have (more on this later), I put them on the lathe and somewhat rounded the corner on the end and collected dust, shavings in hopes of gaining some valuable insight into what our mystery material is. This rounding would show depth grain.
this is the group compare shot.
Mystery Rod
These 4 are from our mystery rod.
Quite interesting. A closeup view.
I think I could call it at this point. This clearly looks like wood. We see wood shavings but on a very small scale.
:Ebonite:
But the question ask "IS THIS EBONITE". So no compare would be proper without some ebonite to compare to.
Note how dusty it looks. Even with the strings there is still dust. Next thing to note is the COLOR. This is BLACK ebonite. Yet we see the yellow/orange which is the sulfur content.
Stabilized Spalted Birch
I have some spalted birch that I had professionally stabilized. The process infuses resin into the wood fibers turning it into a reinforcement.
Note here how the chips looks gummed up like glue was added. The wood is spalted which does break down the chips as well.
:Wood Laminate:
I have some wood laminate, this one is made by timbersmith out of birch. They use glue and other things to bond the boards together. Dye makes them yield the interesting patterns. Also worth note is the MSDS for dymondwood list Phenol and formaldehyde as ingredients. This is some nasty chemicals and caution needs to be used when working this material.
In case anyone is wondering, this wood is a stock that I put on my saiga-12, it's for an AK-47 and I threw it in with the 922R conversion that I did.
:Conclusion:
This mystery rod shows wood chips, smells like wood, does not show ebonite qualities and does resemble dymondwood. While dymondwood is laminate birch (grown in the North East US mostly, i.e. Vermont) there are many versions and I am unable to tell which one it is.
I also noted cracks on the end grain where it was cut so that indicates caution should be taken when turning and working it in general as the material may be prone to cracking under some conditions.
Since there is some type of glue/epoxy/etc holding the sheets together that means that HEAT is your enemy. It was weaken and damage the bond area and cause untold number of problems.
Enjoy.