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I have an unusual project coming up and think it best not to confuse by trying to explain. I remember trying to burn gum many years ago and it was reluctant to burn unless put into a very hot fire. I don't know what variety of gum it was and would have no idea where to get it. Is there another wood with fire resistance that would be as good or better? Where should I look for several board feet? I hope I don't have to ask a local sawyer to come up with a small special order.
My inclination is to say that Redwood is more difficult to burn. But I must say that I think that all wood will burn given the right conditions. Do not despair you can make most verities of wood more resistant to fire using the following preparation: (Important Note: Preparation will not make it impossible for wood to burn, just hard for the wood to catch fire)Materials:1/2 cup zinc chloride2 quarts water1/4 cup ferric chloride3 tablespoons boric acid3 tablespoons ammonium phosphateDirections:Into 2 quarts water, mix 1/2 cup zinc chloride (available from feed and grain dealer), 1/4 cup ferric chloride (available from chemical supply house), 3 tablespoons boric acid (available from drugstore) and 3 tablespoons ammonium phosphate (available from garden supply store). Spray or brush on 2 or 3 coats.This preparation can be used in buildings, for outdoor furniture, camping equipment,etc.Now in addition building materials can be had making a build just about fire proof. Check out the following web site: http://www.wildfireoptions.com/blazeguard_fire%20rated_wood_panels.html