Document MJG4oz7ZLk5YYOY6pyxeG54qa

Under date of April J, 1955 we mailed you a letter and its attachment. Factory Mutual Laboratories Report No. 11864 dated July 1, 1951, revised March 23, 1953> which stated the conditions under which Corrulux could be used for skylights and windows in the plants of the United States Steel Corporation. Since then we have received an inquiry from one of our sub sidiaries, regarding the use of Resolite for the same purpose. Resolite is a product similar in most respects to Corrulux and has the same advantages over glass as those outlined for Corrulux in our letter of April 7, 1955* referred to above. The Insurance Bureau of the United States Steel Corporation has approved the use of Resolite, for skylights and windows, under the same conditions as those governing the use of Corrulux. Information concerning Resolite, if desired, should be obtained from the manufacturer, Resolite Corporation, Zelienople, Pa. or his distributor Elwin G. Smith & Co., Williams Street, Emsworth, Pittsburgh 2, Pa. We would appreciate being advised of your reaction in regard to the possible use of this material, and of any contemplated application. There may be similar products, with varying trade names, appearing from time to time and we would appreciate your advising us as you hear of same} we will, in turn, keep you informed about them. O5 RNB:maf A / /C: .. Subject; Corrulux Skylights and Windows Corrulux is a glass substitute manufactured by Lo 0* Fo Glass Fiber Coo, formerly The Corrulux Division of Llbboy-Owens, Ford Glass Co, P,, 0 Boa 2C02o, Houston, Texas* Tho six 'standard colors available are coral, skylight green, light ivory, slcybluo, sunlight yellow and forrost green* It ivoigha l/2 pound per square foot, is nominally l/l6" thick, will carry 100 pounds per Gquare on a four foot span, is interchangeable with corrugated roofing and siding, fastens with tho same fasteners, and can bo used on standard purlin spacing up to five foet* It is available in widths from 26" to 42", lengths up to 12 feet, and corrugated in any commercial sicos0 It is a shatterproof, corrugated, translucent material made from tough weather resistant resins reinforced with fiber glass* It will ignite and burn whon oxposod to flamo, impingement or temperature of about 850 degrees Fo Tho plastic rosins are vaporized or distilled from tho matorial when exposed to temperatures from 500 to 800 degrees Fo, re sulting in discoloration of the surface,. The rate of vaporization increases with the temperature with little damage to the material in the 500 degree range* The Safety, Insurance, and Engineering Divisions of `the Uo So Stool Corporatio have approved the use of Corrulux under the following conditions; I* Unlimited areas of Corrulux raay be used if the building has sprinkler protection* 20 It may be usod on buildings in which sprinklors could normally be omittedo 30 Corrulux is not to be installed on buildings in continuous lengths over 250 ft,, Fifty foot long sections of corrugated steel roofing is to be installed between 250 ft long sections of Corrulux,, 4a When Corrulux sheets are used as small panels or intermitton area instead of continuous rows, a fifty foot separation of corrugated stoel roofing or siding is to be provided every 400 ft0 50 Adjacent or parallel continuous rows or panels of Corrulux are to be separated by at least 10 feet of corrugated steel roofing or sidinga 60 Corrulux sidewall pano/.s are to be located near the eave line and not more than 8'feet hich0 Loforonce Engineering Dopto Library File No0 L-114 s_- Chief Engineer USHO 002835