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Show plants, important bridge jobs, and immense hangars. This helped to relieve the heavy demand on critical steel needed for tools of war. During the past 10 years over 130 chemical formulas were studied for fireproofing qualities in the U. S. Forest Products laboratory and the National Bureau of Standards. When flame touches treated tim ber, the chemicals cause an armor of an unusual, comparatively inert, charcoal to form, which protects the wood underneath against the flame. Flameproof ed Lumber Releases Steel for War Although formulas for making wood fire-resistant have been known for 50 years, the flameproofing of wood only reached large-scale production pro-duction in time to meet the critical needs of a nation at war and became be-came an important factor in 1942 war construction. Taking over jobs that were previously pre-viously considered mostly in the structural steel field, timbers treated treat-ed to resist fire moved into war |