Document ZG2m79mkzoeBypx2jkQNN7wY

>43*1 i.i ' U'i ' -V> Li\s INTRA-COMPANY CORRESPONDENCE 1! JUN 2S f3S3 PLAINTIFFS EXHIBIT r Mr. J. H, Boynton - New York June 20, 1963 nm William A; Lott Oraaviile Ml Mr. ft, 0* Aaos - Berlin Mr. R. E. Davis - Newark METHODS FOR EVALUATING XAYLO DUST Mr. A. S. Kevlin - New York Mr. 0* W. Pfiefer - Toledo*^ Mr. J. B. Rhoads - Berlin Mr. H V. Smith - Toledo Mr. J. M. Westlake - Granville There are several associated problems Involved in the category of Kaylo dust. These can be broken into three specific problems as follows: 1. The amount of dust which occurs on the surface of the material which becomes bothersome when handling the product. 2. The dust becomes airborne when the product is cut or fabricated, 3. The health hazard of the dust with respect to asbestosis. The current OCF Test 'Method No. M-078 is a measure of only the surface dust and does not give any indication of the other two problem areas. From what I have been able to ascertain, the primary dust problem with any insula tion material ia the dust that becomes airborne when the product is being fabricated. This becomes a serious problem in any location where a fabrica tion shop Is set up and a large quantity cf dust is being generated in a confined area. This is the case in the Union Carbide Chemicals Company jnstituto, West Virginia, Insulation Fabrication Shop which I visited on May 16, 1963. I discussed the problem of dust and dust measurement with * Mr. Robert 8. Peele, the industrial hygienist. They utilized a standard dust impinger for collecting samples. The procedure for measuring the amount of dust is involved and requires several pieces of small equipment which we do not have in our laboratory. Based on the threshold limit values of the American Conference of Governmental Industrial Hygienists, the maximum allowable asbestos dust in the air where people are working vs 5 millions of particles per cubic foot of air. Based on the asbestos content of Kaylo, this would be a limiting value of somewhere between 20 and 30 millions of particles per cubic foot of air of Xaylo dust above which a definite health hazard would exist. According to the measurements made by Union Carbide in their fabrication shop with the duet collection system in operation, there was approximately four to 18 MPPCF with an average of J.0 MPPCF using Kaylo. However, when Thermobestos is used under the same circumstances, the dust count exceeds 100 MPPCF which means that Thermobestos is a definite health hazard. These values were given to us by Mr. Peele as Brand X rather than by their actual name, but we know from past experience that the material la Thermobestos, Oi 081 1884- Mr. J. H. Boynton -2- June 20, 1963 The OCF Test Method shove Thermooestos to have less dust than Kaylo which might be expected as Tbermobestos has molded surface areas vhereas Kaylo blocks are cut and hence will have residual saw dust on the surface* I have in ay files all of the details of the exact procedure that Union Carbide follows is collecting and analyzing dust samples. 1 am not too certain that their procedure is representative for the general case, but it is also obvious that the present OCF Test Method M-07B is not answering our basic dust problem. I recomoend that as soon as man power permits our Test Method Development Group begin the assignment of more completely evaluating the dust problem and evolving a method which comes closer to evaluating all of the facets of the dust problom. This method should be made applicable, to other products such as GFL-400, etc. WAL:vv William A. Lotz Product Testing 01 o&l 18R5