The Evaluation of Wood Preservatives: Part II

This paper offers a review and interpretation of laboratory and field experiments aimed at determining the necessary protective threshold quantities of wood preservatives. It details the procedure followed in the soil-block tests at Bell Telephone Laboratories, Incorporated. Discussion of specific criticisms of the techniques involved and replies to these criticisms are included. The paper also presents for the first time a correlation of the results obtained from soil-block culture tests, outdoor exposure tests on slakes and on pole-diameter posts as well as pole line experience. TABLE OF CONTENTS --Part II Evaluation by Treated % Inch Southern Pine Sapwood Stakes in Test Plots Rating the Condition of the Stakes Depreciation Curves for % Inch Stakes Estimating Threshold Retentions and Average Life Evaluation by Treated Pole-Diameter Posts in Test Plots Evaluation by Pole Test Lines and by Line Experience; Service Tests.... Discussion Density and Growth Rate Size and Shape of the Test Blocks Toluene as a Diluent for Creosote Treating Solutions The Distribution of the Preservative in the Block Ileat Sterilization of the Treated Blocks The Weathering of Creosote and Creosoted Wood General Considerations; Creosote Fractions Creosote Losses Creosote Losses from Treated Blocks Creosote Losses from Impregnated Filter Paper An Interpretation of Creosote Losses The Gross Characteristics of the Residual Creosotes in Soil-Block Tests of Weathered Blocks The Evaluation of Greensalt The Evaluation of Pentachlorophenol Swedish Creosote Evaluation Tests 425 427 427 431 434 443 449 451 452 452 455 456 456 457 458 461 469 473 474 479 487 488 489 426 THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1 9 5 3 EVALUATION OF "WOOD PRESERVATIVES 427 Shortening the Bioassay Test 490 Toughness or Impact Tests for Determining Preservative Effectiveness.