(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 chloride
2 quarts water
1/4 cup ferric chloride
3 tablespoons boric acid
3 tablespoons ammonium phosphate

Directions:
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.

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Article Source:http://howtomakestuff.com/2004/01/23/outdoor-26/