More burned wood

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Project by Puupaja posted 11-30-2009 06:01 AM 3624 views 1 time favorited 13 comments Add to Favorites Watch
More burned wood
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This is board for kitchen I made from heat treated birch. It´s oiled first and then I waxed it with Osmo color oilwax. I don´t know how much you know about thermowood but here is something about it and


13 comments so far

View jackass's profile


350 posts in 3861 days

#1 posted 11-30-2009 07:01 AM

Hi Puupaja,
I have been trying to find information on this type of wood here in Canada. I understand this process is done by microwave and takes the place of kiln drying. I have a piece given to me by a supplier, but he doesn’t stock it any longer. It is a beautiful colour and and they dry oak and maple with this method. I think your process in Finland is probably similar I would like to hear from someone that might know about it here in Canada. I would like to do a whole set of kitchen cabinets like this.

-- Jack Keefe Shediac NB Canada

View Puupaja's profile


310 posts in 3248 days

#2 posted 11-30-2009 07:25 AM

Hello Jack,

It´s not with microwawe they put wood in sealed container and heat it that temperature is about 180-240 C. It is really important that container is closed because with oxygen it will explode!! The process takes less than 24 h. With more temperature you get darker wood but lose strengten of wood. I will post more pictures later what I have done from this kind of wood



View a1Jim's profile


117238 posts in 3725 days

#3 posted 11-30-2009 07:49 AM

Hey Matt welcome to Ljs
Very nice wood and interesting process.

-- wood crafting & woodworking classes

View Scott's profile


4 posts in 3251 days

#4 posted 11-30-2009 08:18 AM

Do you know if this process makes the wood weigh less?

-- -Scott

View Puupaja's profile


310 posts in 3248 days

#5 posted 11-30-2009 08:54 AM

Hello Scott

Yes because all the moisture goes away, like spruce and pine lost also pitch


View OhValleyWoodandWool's profile


970 posts in 3268 days

#6 posted 11-30-2009 09:35 PM

Pretty wood – never heard of the process – interesting

-- "All you need in this life is ignorance and confidence, and then Success is sure." Mark Twain

View RexMcKinnon's profile


2593 posts in 3343 days

#7 posted 11-30-2009 09:51 PM

Is this the same procedure they use to darken bamboo? I think so, it’s one of the reasons they say bamboo flooring is greener than others. No chemicals used to change the color.

-- If all you have is a hammer, everything looks like a nail!

View NoSlivers's profile


210 posts in 3238 days

#8 posted 12-14-2009 06:10 AM

birch…. wouldn’t have guessed that. I checked out the liinks you placed in the post, but remain uncertain about a couple of aspects. What are the size limits on the pieces of wood that can be treated in this manner? For instance, could someone do the initial green turning of a bowl (leaving it fairly thick) and then heat treat? Or would that just increase the likelihood of cracking, since it’s removing the moisture so quickly? If this would work without ruining the bowl, you could really be onto something here.

-- If you don't have time to do it right, do you have time to do it twice?

View Puupaja's profile


310 posts in 3248 days

#9 posted 12-14-2009 08:28 PM

Hi Nosilvers! I have seen knife handels what was in final shape, they but them to owen in metal cage and there was many hunreds of these. Maybe it is possible do it with bowl also, but the charge of treatmend goes with volume so maybe it pretty expensive.. cost of threatment is little over 200 €/ cubic meter ( about 300 $ per 35 cubic foot). Wood does not crack during process it only kind of shrink little. this is adress for heattreated handle of knife


View reggiek's profile


2240 posts in 3418 days

#10 posted 12-14-2009 08:43 PM

Excellent info…thanks Puupaja….I haven’t had the chance to consider this before you posted….it is a beautiful result….certainly a great idea to keep in your arsenal of ways to finish projects.

By the way NoSlivers….I use a microwave to speed up the process of curing my green turned bowls (only when they fit in the MW of course) . You can also boil them…see for info on this process.

-- Woodworking.....My small slice of heaven!

View NoSlivers's profile


210 posts in 3238 days

#11 posted 12-16-2009 05:41 AM

Well, this is getting off topic for this thread but… The microwave gives me mixed results, sometimes it increases the warping. Perhaps I’m not paying attention to the flow of the grain and I’m setting myself up for this, or maybe I’m just not leaving it thick enough before microwaving. Sometimes it works fine and sometimes I’m left wondering what I did wrong. I haven’t tried boiling….

-- If you don't have time to do it right, do you have time to do it twice?

View rusty2010's profile


150 posts in 2706 days

#12 posted 03-29-2014 01:17 AM

beautiful piece of wood, do you know if the sell it in the states. thanks

-- check, recheck then check again

View Puupaja's profile


310 posts in 3248 days

#13 posted 03-29-2014 08:02 AM

Hello sorry I don`t know if available in states


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