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Formosan koa (Acacia confusa)
Formosan koa (Acacia confusa)

Common Name(s): Formosan koa

Scientific Name: Acacia confusa

Distribution: Southeast Asia and Pacific Islands

Average Dried Weight: 52.4 lbs/ft3 (840 kg/m3)

Comments: Not to be confused with the much more commercially popular and common koa (Acacia koa), found mainly on the island of Hawaii. Formosan koa is a slightly heavier and more obscure wood. The root bark of the tree is sometimes harvested and ground into a medicinal powder.

Note: This is a truncated profile page. If you have any helpful info or experience with this wood species, feel free to leave a comment below and I’ll do my best to integrate any relevant data when I expand the page. ~Eric

Images: Drag the slider up/down to toggle between raw and finished wood.


[caption id="attachment_22051" align="alignleft" width="300"]Formosan koa (Acacia confusa) Formosan koa (Acacia confusa)[/caption]

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fede

is it also suitable for boat building? I am looking for something rot resistant

Andy Brennan

Hardest wood to be found in Taiwan, will tear out easily in a planer due to grain direction variation, I use a router sled to flatten.
Sanding up through the grits from 120 – 400 brings out the beauty of the wood, starts to get a burnished shine at 320 – 400, more so when progressing up to 1000 grit, the grain really pops after wax paste and machine buff.

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Andy Brennan

Beautiful wood to work with, poses some challenges at times but the finish is amazing.

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Victor Seow

What is the Junka hardness of Formosan Koa? Is it also used to make guitar tops?

Andy Brennan

1460 lbf, yes it could be used for guitar tops.

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Jeff

I’ve worked with a few smallish pieces. I found it noticeably denser than common koa, more along the lines of purple heart. The grain was also much more dramatic than the picture here. I didnt have any issues with glue. I did notice a minor tendency to tear-out on the planer but that might have been dull blades at the shared shop I use. The boards I was able to get also tended to be quite narrow; in the 4-6″ range with nothing over about 6.5″ available.