Document Rjoqd6eVRJxEZjV6GD2L74d8V

JGHNS-MANVILLE RESEARCH AND ENGINEERING CENTER MASTER rILfc. COPY Report No Date r* O.L November 6, 1962 Title: delami nation free thermobestos by pan casting Progress Report No. 2 - Dustiness During Fabrication Requested by: Sales Product Request 3090 SUMMARY ;. K! b / ' `` " Preliminary dust concentration tests indicated that the superiority of Kaylo over standard Thermobestos and experimental pan cast Thermobestos reported by Union Carbide is questionable. Standard Thermobestos appeared equivalent to Kaylo and two of the experimental pan cast formulas appeared superior. It is recommended that the results of these tests be reviewed with the Product Manager to determine which samples will be submitted to Union Carbide for their tests. Contents : Summary, Discussion, Recommendation, Appendix I - Formula, Appendix II Test Data. Approved by iI j\ J-r; 1 W. L. Stafford Reported by 0. Ayers ojo oc : P. B. Proctor, GH (S) C. F. Rassweiler, GH J. 3. Jobe, DH (S) A. C. Smith + S) I'.. . Burleson, DH (S) J. A. McKinney E. F. Briggs, DH (S) J. Q. Trice A. Pocius, DH (Excl. App. I) F. L. Pundsack C. E. Ernst, DH (Excl. App. I) Att: C. B. Bradley C. A. deVyver, DH (S) W. L. Stafford (MF-233) / E. C. Lindstrom, DH R. B. Dunbar /u Y '</ S. Lane, Long Bench 0. Ayers K. H. Slater, Manville plant File: R. W. Honnig, Manville plant W. M. MacAlpine T. F. Dodnarchuk, Manville plant Library (3) L. I!. Adamson, Tor Off (Excl. App. I) C A. G. Sinclair, Tor Off !<' ('< '< S/Sl'/cC N 2. Ol.pkanT -OI+IrN I T.U .-A: jUhfti-HAfi*ILLE RESEARCH AMD ENGINEERING CENTER m F\ Pa?: ::scuss:on Atmospheric dust concentration tests were rrj.de on Cctooer 30, 1962, during fabrication cf insulation blocks on the DO-ALL Model L-H-V band saw in the Research Center Materials Testing Laboratory sanple preparation room. The National Conference of Governmental Industrial Hygienists Test Method was followed using the Gresnburgh-Snith iaspinger. Tests were conducted by Mr. T. F. Bodnarchuk of the J-M Industrial Hygiene Laboratory at Manville. To obtain comparative data, the room ventilation was adjusted to give cere a_the usual amount of atmospheric dust. The test set up is shown in the pho: ograph below. t I 2 i S. 2 I' >i i i f! I /r't ? ~ /v- r JQHNS-MAMYILLE RESEARCH AND ENGINEERING CENTER Report No. 4-3^-^5 7-SI Page 1 DISCUSSION Atmospheric dust concentration tests were made on October 30, 1962, during the fabrication of insulation blocks on the DO-ALL Model L-H-V band saw in the Research Center Materials Testing Laboratory sample preparation room. The National Conference of Governmental Industrial Hygienists Test Method was followed using the Greenburgh-Snith impinger. Tests were conducted by Mr. T. ?. Bodnarchuk of the J-M Industrial Hygiene Laboratory at Manville. To obtain comparative data, the room ventilation was adjusted to give acre than the usual amount of atmospheric dust. The test set up is shown in the photo graph bolow. tlftb u lu ** ot ffpm *U fat*on .O n ; iDL.N I lA u . A.-*, f o r i j 2 t l I I jOHNS-MAMVILLE research AND ENGINEERING CENTER Rcpor! No. 4-32-25 7-31 Page 2 In addition to the room ventilating system, air --as removed from directly above the block at a rate of 37 cu ft per min and from the metal housing surrounding the saw at a rate of 15 cu ft per min. The saw blade was standard and had six teeth per in. and a lineal spend of 2600 ft per min. The blocks were 13 x 11 x 4 or 6- In. and were cut so that the blade entered the 11-in. edge. Five types of insulation were tested including standard Thermobestos, Kaylo, and three experimental pan cast blocks. Formulas are given in Appendix I. Prior to testing, blocks of each were conditioned by: a) drying a minimum of seven days at 250F; b) drying at 250F and conditioning for 18 days at 70 per cent RH, 70F; c) drying at 250F and conditioning for 18 days at 95-100 per cent RH, 95F. The test data are given in Appendix II. The dust concentration tests were analysed and indicated that the superiority reported by Lfnion Carbide of Kaylo over standard Thermobestos and the experimental pan cast blocks submitted to them is subject to question. The results also indicated that the slate dust composition, 2-AT, caused less atmospheric dust than the other types of blocks. The effect that conditioning of the blocks had on the dust concentration in air was not apparent. This is attributed to the limited amount of material tested and the possibility that an equilibrium condition of dust concentration in the sampling area may not have been reached in some cases. In order to definitely establish the effect moisture content of the blocks has on atmospheric dust a more extensive series of tests would be required. Such tests would also serve to more definitely establish the relative dustiness of the formulas investigated. JOHNS-MANVILLE RESEARCH AND ENGINEERING CENTER Report >o. 432-257-S1 Page 3 APPENDIX I . FORMULAS Rau !-'n,terials Expe rimental Pan Cast 6-in. Blocks . -l-AT . 2-AT* `-AT* Hydrated Lime, Varner - % 45.2 44.2 44.1 W-3 Amosite - % 12.9 12.1 12.1 Celite 256 - % 25.8 - 12.9 Celita 392 - % --------- 16.1 - - Silex (Supersil) - % - 19.5 25.8 Bentonite, Schundlers - % - 10.2 5.1 Blue Black Slate Dust - % 14.0 -- Std. 4-in. Thermobestos 4--A 'TX> Std. 4-in. Kavlo 5-AT ** 44.5 11.1 29.6 14.3 - -- 'Formulas 2-AT and 2-AT are identical to formulas 111 and 85 in Research Report No. 432-257 of September 5 1962, by R. B. Dunbar and J. F. Palochko. For additional information refer to that report. Competitive material, no formula available. JGHHS-MANVILLE RESEARCH AND ENGINEERING CENTER Report No. 132-257-01 - Page 1 APPENDIX II TEST DATA I ATMOSPHERIC DUST CONCENTRATION DATA Experimental Pan Cast o-in. Blocks 1-AT 2-A'f . . 3-AT* Concentration in mppcf of Air Cried at 250F Conditioned at 70* Hit, "OF Conditioned at 95-100* RH, 95F 110.8 39.3 99.6 Avg. of .three conditions 83.2 19.9 11.8 10.6 15.1 16.1 17.1 31.1 31.6 Moisture Absorbed During Conditioning - * Cry to 10% RH, 70F Dry to 95-100* RH, 95F 2.7 13.6 2.0 12.3 2.5 17.2 Std# 4-in. Therrobsstoa l-AT Std. Kavlo 5-AT 31.2 15.8 101.0 51.3 \ 6.8 15.6 52.0 36.1 97.6 62.0 3.9 12.3 This formulation was used for samples submitted to Union Carbide for evaluation. Refer to formula No. 58* samples 21, 22, 23, Research Report No. 132-256, p 1. v.