Show Lumber Releases es Steel for lor War Although formulas for making wood tire fire resistant have been known for 50 years the of wood only reached large scale pro productIon production in time to meet the crit cal needs of a nation at war and be became became came an important factor lD in 1942 war construction Taking over Jobs that were pre previously consIdered mostly m the structural steel field timbers treat treated ed cd to resist fire moved into war plants Important bridge jobs and immense hangars This helped to relieve the heavy demand on critical steel needed for tools ot of war During the past 10 years over chemical formulas were studied for tor fireproofing t es in the U S Forest Products laboratory and th the Nat onal Bureau of Standards When flame touches treated tun her the chemicals cause an armor of an unusual comparatively Inert charcoal to form which protects the wood underneath against the flame |