Document Rp5L4XDgK6466MOwRn8Gyw7Jk

___i L. William R. Bradley and Associates ENVIRONMENTAL HEALTH CONSULTANTS 18 GREEN STREET NEWARK, N. J. 071C2 201 622-{246 March 8, 1967 Sprayed Mineral Fiber Manufacturers Association, Inc. Suite 2300 One Wall Street New.York, New York 10005 Attention: Technical Committee Re: am MENTAL HEALTH INVESTIGATION . An environmental health investigation was made for the Sprayed Mineral Fiber Manufacturers Association, Inc., on March 1, 1967 at the United States Mineral Products Company, Stanhope, New Jersey. The area set aside fo** this study was indoors at a comer of a small space Isolated from the rest of the research department's laboratory. The area to be sprayed was a celling space about nine feet above floor .le vel and an adjoining wall space. This space was adjacent to a large rollup double door. The door could be opened and a large propeller fan used to air out the space following each test ____i. *w < . :? s i it i ! lj .. i' ' ; : C \ ' J& ___ ka ^ U -2- I The spray operator held the application nozzle about five feet from the ceiling area and five feet frora*the wall area which was being sprayed. Air samples for dust were col lected at head level at about three foet from the operator in this rather confined area of the building. The products test ed for airborne dust during application were as follows: United States Mineral Products Co. (USMP) Cafco Blaze-Shield Type D . Baldwin-Ehret-Hill, Inc. (BEH) Pyrospray Type 1 Smith & Kanzler (S&K) Spraycraft 1132 Type s Asbestospray corporation. (Ash.) Asbestojpray Type T The above products were sprayed at a 1:1 ratio of water to dry fiber weight. The application rate was five pouu:,. tea pounds, and fifteen pounds per minute of dry feed. In the case of Asbestospray, the product was applied from a 16 jet nozzle at five pounds and ten pounds per minute and from a 12 jet nozzle at-the same rates. All other products were applied at the three above mentioned rates using the 16 jet air-water nozzle and the model "A" internal gun without air. rjLgp.? L J **.' i"./ z* *: ** DUST SAMPLE ANALYSIS . Test Wo. 1. Type of Gun Water Flow 16 Model 12 Product (lbs./min.) Jet "A" Jet Control Millions o Particles per Cubic Foot of Air 1.2 j I L., i V..v Li U -4- SUMMARY The results of dust studies made in a confined area of spraying mineral fibers shows that the ten pounds and fifteen pounds per minute flow rates are less dusty then the five pounds per minute rate. Also shown is that the combination of air and water in a 16 jet gun results in less airborne dust then does the use of model "A" gun without air or the 12 jet air and water combination nozzle. ihe control dust levels show that there was no buildup of dust between sampling tests and t'.ie use of different prod ucts. It is conceivable that the Asbestospray. product and the United States Mineral Products product could be sprayed in an open building under construction using the most favorable air water gun, product flow rate and water to dry fiber ratio at airborne dust concentrations near or less then the threshold limit value of five million particles per cubic foot of air. 2he water to dry product ratio for the application of Baldwin-Ehret-Hill and the Smith & Kanzler product is insuff icient to control both asbestos fibers and clay additives. WRB/dm UhH' A? William R. Bradley *