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William IL Bradley and Associates
ENVIRONMENTAL HEALTH CONSULTANTS 18 GREEN STREET NEVARK, N. J. 07102
201 622*4246
March 8/ 1967
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Sprayed Mineral Fiber Manufacturers Association, Suite 2300 One Wall Street New York, New York 1000S
Inc.
Attention: Technical Committee
Re: ENVIRONMENTAL 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 for this study was indoors at a corner of a small space Isolated from the rest of the research department's laboratory. The area to be sprayed was a ceiling 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.
area which was being sprayed. Air samples for dust were col lected at head level at about three feet 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-aill, Inc. (BEH) Pyrospray Type 1
Smith & Kanzler (S&K) Spraycraft 1132 Type S
Asbestospray Corporation (Asb.) Asbestospray Type T
The above products were sprayed at a 1:1 ratio of water to dry fiber weight. The application rate was five pounds, ten 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.
Teat NO.
Water Flow Product (lbs . /min.)
Tyne of Gun 16 Model 12 jet "A" Jet
X. Control
2. Aab. 3. Aab. 4. Asb. 5. Aab.
5 10
5 10
X X
X X
6.
7. 8. 9. 10. 11. 12.
Control
BEH BEH BEH BEH BEH BEH
5 10 IS
5 10 IS
X X X
X X X
13.
14. IS. 16. 17. 18. 19.
Control
S&K S&K S&X S&K S&K S&K
s
10 15
5 10 15
X X X
X X X
20.
Control
21.
OSMSG-'
22^' ?USMP^
23 T
USHP
24.
OSHP
25. USMP
26.' 'USMI*
S 10 13
5 10 IS
X X X
X X X
Millions of Particles oer Cubic Foot of Air
1.2
8.0 6.0 9.0 7.0
1.4
1S.0 14,0 12.0 21.0 18.0 17.0
1.4
19.0 17.0 16.0 24.0 22.0 20.0
1.4
8.0 7.0 6.0 9.0 8.0 7.0
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SUMMAPY
;> < The results of dust studies made in a confined area of
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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 "Art gun without air or the 12 Jet air and water
combination nozzle. The control dust levels show that there was no buildup
of dust between sampling tests and the 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.
The 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.
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