Document JrJYzQYBEzvOOw7YnZw1dOy1X

Johns-Manville Research Center Hanville, Hew Jersey April 29, 1949 DEHSITI OF ASBESTOS FIBERS ARB OTHER MATERIALS USED IH THE MANUFACTURE OF TRANSITS PIPE. Requested by: R* L. Barbehenn In connection vith the study of the operation of the Research machine for the manufacture of Transits pipe, and in the investigation of significant variables in the properties of the vail of the pipe, particularly as shovn in Research Report Ho* 425-Tr-92, - the densities of the dry ingredients of the furnish were determined as shovn in the accompanying table* The densities of the asbestos fibers are of particular interest to all vho have to do vith the compounding of such asbestos fibers into rigid products. ; These data permit computations to be made of probable veights per cubic foot of many products of knovn or assumed void space* In finished products these data are essential to the calculation of the compactness* The determinations of the densities of asbestos fibers as used in manufacturing do not seem to have been made*. The fibers used in manufacturing have been cleaned by the removal of more or less of dust and stones and have been sub jected to villowing and other operations* The published values of the density of various asbestos fibers evidently refer to massive asbestos considered from a mineralogical point of view, and are rarely quoted beyond the first decimal place. / The determination of the density of the materials herein reported vas made according to the Standard Methods of Test for Specific Gravity of Figments of the American Society for Testing Materials, Serial Designation B 153 39, Method B for Tests Requiring Highest Accuracy* The Specific Gravity was calcu lated as referred to water at 4 degrees Centigrade, giving the density or weight per unit volume as required by this Method B, and not as referred to water at 15*6 degrees Centigrade as called for by the Routine Method A. The probable error, of the determinations reported herein is less than 5 units in the third decimal place;(plns or minus 0*005)* The gravimetric method vas used throughout and weighings made to the nearest milligram. '~ ^-vs^wsr * Johna-Manville Research Center Manr!lie. Rev Jersey 7Report Re. 425-Tr^97 Problem Ho. 63-480 April 29, 1949 ^ I Summary; (Cont'd.) -2- Material Teetedi . The following materials were those in nse on or about April 15, 1949 for the manufacture of Transits pipe; 1. New Jersey Silex, sample taken by Mr. P. Wehrfritz. 2. Atlas Portland Cement, sample taken by Mr. F. Vehrfritz. 3. National Portland Cement, sample taken by Mr. F. Wehrffritz. 4. Chrysotile Asbestos Fiber, 4M28, sample taken by Mr. M. S. Badollet. 5. Chrysotile Asbestos Fiber, 7iay, sample taken by Mr. M. S. Badollet. 6. Chrysotile Asbestos Fiber, C & G #3, sample taken by Mr. M. S. Badollet. 7. Chrysotile Asbestos Fiber, C & G #4, sample taken by Mr. M. S. Badollet. 8. Chrysotile Asbestos Fiber, BC4T, sample taken by Mr. K. S. Badollet. 9. Crocidollte Asbestos Fiber, African Blue, sample taken by Mr. M. S. Badollet. 10. Crocidollte Asbestos Fiber, Australian Blue, sample taken by Mr. M* S. Badollet. Approved by: Frank M. Biffen Reported by* Frank Gottseh This report consists of Summary (1) and Results of Tests (2). cc: C. F. Rassveiler, .GHQ s. Colliery. &. R. Williams R* T. Halstead _ A. B Cummins M. S. Badollet F. Wehrfritz H. T. Coss J. L. Tucker R. Jacob, Manville Factory J. S. Parkinson 6. B. Brown R. L. Barbehenn