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11 fiber building 30 UNAGED acceler accelerated aging cycle accelerated aging treatment aged boards aging procedure Air permeability alpha-cellulose approxi boards have excellent boards showed BUILDING MATERIALS Bureau of Standards cellulosic purity changes Chemistry Codes Building condensed steam cycle for fiber Department of Commerce desirable properties deterioration edges sealed Electrochemistry excellent stability exposures F. T. Carson Fiber Board fiber building boards flexural strength force required Forest Pathology freezing Government Printing Office hours at 100 illustrated in figure inches Insulating loss in flexural mately MATERIALS AND STRUCTURES Metallurgy moisture nail-holding strength National Bureau natural aging Painted and unpainted paper percent phase was added pounds properties are retained properties rather rapidly Research NBS 20 rot-producing fungi SAMPLE Figure shown in figure sprayed steam at 90 strength test struction Superintendent of Documents test is illustrated Textiles tion total of 300 U. S. Government Printing United States Department water absorption water penetration Weights and Measures