Teak Cutting-Board Glue-Up

      Woodworkers discuss food safety issues and adhesion concerns related to making cutting boards from Teak. January 23, 2009

Question
My intended method of construction for teak cutting boards is as follows: rip rough stock to 3" or less widths, clean edged with lacquer thinner and laminate with west systems epoxy or Gorilla Glue. Comments concerning these methods and final care once delivered would be appreciated.

Forum Responses
(Architectural Woodworking Forum)
From contributor K:
I have two questions I don't know the answers to so I'm wondering if you have considered them. The glue you are planning to use, is it FDA approved for direct food contact? The second question is, is teak ok for direct food contact? I would want to know the answer to these before going ahead with this project.



From contributor J:
Three inch wide boards, edge glued for a cutting board? I don't think so. I would start with 8/4 stock and rip them into square sticks. Next glue them back together with the harder, vertical grain up (for slicing and chopping) and for the superior flat-grain glue-joints. You should also minimize any warpage with this method.

You might also run at least a couple of cross-grain dado cuts on the back and fill them with glued-in sticks. On boats, I've gone so far as to put stainless all-thread rods through the whole thing with recessed and plugged holes.

For yacht work, the Teak often has a holly or maple strip placed between each piece. This looks great but also eliminates 1/2 of the oily surfaces associated with the teak. Either way, teak is certainly not the best choice when it comes to gluing and laminating and your biggest challenge is keeping it all together.

I am afraid I don't like Epoxy either for any clamped glue-joints. It all squeezes out leaving only a very thin, weak film. I've had Teak glue-joint failures with both Epoxy and Gorilla glue. The Gorilla stuff will foam all over the place and leave your paws looking like the label. I think I could use some advice myself on the glue question.



From contributor R:
Could you use mahogany? Its not the best choice either, but if you really needed something that kind of looked like teak, it would be better.

As others have said, you've got some issues with teak. For starters you should rip and rotate 90 degrees so the face of the cutting board ends up being side grain (unless it's quarter sawn teak). Then the gluing - epoxy or poly should be ok, because a cutting board shouldn't require that much strength out of the glue line. But as others have said, I'd think you'd want the smallest glue-line possible, which means very tight clamping, and that's not the best scenario for epoxy. And then there's the toxicity question with teak.

And lastly, even if you get past all the above, you're still left with a cutting board made of a wood that is very abrasive. All that silica that makes teak so very hard on tools will have a similar detrimental effect on the edge of the kitchen knife. It reminds me of some of those "cutting boards" made of glass I saw years ago. My mother had one and it made me shudder every time I saw her use the beautiful Japanese laminated steel knife I gave her on it. And she frequently complained of the knife being dull.



From the original questioner:
I have been over the use of alternative materials with the client and the only other material they would consider is bamboo and I drew a blank on a source of 6/4 bamboo.


From contributor A:
Like the others have mentioned teak is a tough customer. I would go with the solvent wash and epoxy method. You will have a better chance with MAS epoxy resin. Their FLAG resin is very thick and will no soak in too much like the West System. You should rough up the edges of your boards with 80 grit paper. Epoxy doesn't like smooth jointed edges.


From contributor R:
I hate to be old fashioned but what about DAP WELDWOOD Resorcinol?


From the original questioner:
That resorcinol - is that a powder with a catalyst? I remember using something like that a long time ago. Is it red when mixed ? Is it still available?


From contributor K:
I guess I never answered your original question in my first post. I have worked with teak and yellow glue and if you use the cleaning process with lacquer thinner it glues just fine and stays. I never work with epoxy so I can't give any help with that. I also agree that I don't think I would use Gorilla glue for this. For me the bottom line is, does the glue have FDA approval for direct food contact? The same for teak, will the natural oil content of teak leach into food prepared on the cutting board, and is that safe?


From contributor T:
Edge-glued teak is probably ok if it's only going to be used for bread or cheese. Contributor J is right about chopping or cutting meats, veggies, and other foods. It needs to be endgrain and only a tight, closed grain such as hard maple. Just look at the commercially made chopping blocks and cutting boards, they are almost always maple or bamboo. Never use an open-grained wood such as mahogany, as bacteria loves open grain hiding places. PVA glues are food save and durable.


From contributor F:
Teak is safe for cutting boards. We have never had glue joint failure using epoxy on teak. Rough up the joints slightly and use colloidal silica in the mix to thicken the epoxy after mixing. It should be the consistency of mayonnaise. Epoxy is pretty much inert after curing and will not be in direct contact with food unless the joints are highway wide.

Using two square is the preferred stock size for this sort of work. We have done several huge teak jobs over the last few years and have had great success with this method. We do use stainless all-thread as a safety precaution (and permanent clamp) in exposed barbecue countertops - we are located in the tropics and exposed teak either cooks in the sun or gets drenched with rain in alternating doses.



From Gene Wengert, forum technical advisor:
Can you give us a reference for your statement about teak being safe for cutting boards? I do wonder if the teak oil is indeed safe.


From contributor F:
Gene - I do not have a specific reference but teak cutting boards are sold all over the world as are teak salad bowls and utensils. I suppose you could check with the U.S. regulatory body that deals with these things. I have been chopping up things on teak cutting boards all my life with no apparent ill effects - suitable materials should be listed somewhere. Sorry I can't supply a specific reference.


The comments below were added after this Forum discussion was archived as a Knowledge Base article (add your comment).

Comment from contributor A:
I am living in N. Thailand and we have a wealth of old-growth (reclaimed) teak. My experience with teak, cutting boards and glue is as follows:

Teak is safe for cutting boards - some people are allergic (mostly respiration) to teak dust or teak oil. Teak wood alone does not affect people.

Glue - gorilla is waterproof, dishwasher safe and foodsafe, although Ive never been able to get their FDA certificate. The upside is that it has a very short curing time. The downside is its expensive and can be messy.

Teak oil has never affected our glue joints - we take no special care.

End-grain boards are far superior to long grain boards. I think that the old-growth teak end grain chopping board is a really nice board - basically maintenance free, smells of garlic, etc disappears after a couple of hours and it leaves almost no knife marks.



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