Document G6xRrGMdjJQ5EbQkZ7knvED97
* NORTH CAROLINA
STATE BOARD OF HEALTH
J. W. R. NORTON. M. D,, M.R.H.
tate health oirector
SECRETART.TREASURER
JACOB KOOMEN, JR.. M. D,, M.R.H. ASSISTANT STATE HEALTH DIRECTOR
RALEIGH 27602 September 3, 1964
MEMBERS
LENOX D. BAKER, M. D., fuel. . . . DURHAM JOHN R. BENDER, M. D.. VlCE.rRES. WINSTON-SALEM BEN W. DAW3EY, D. V. M............................... Gastonia GLENN L. HOOPER, D. D. 8................................DUNN OSCAR S. GOODWIN. M. D....................................APEX D. T. REDFEARN. B. 3................................. WaOCSBORO JAMES S. RARER. M. D................................ ASHEVILLE SAMUEL G. KOONCC, RH. O. . . . CHAOIOURM JOHN S. RHODES, M. D................................. RALEIGH
I
Mr. T. S. Sadler, Superintendent H. K. Porter Company, Davidson Works
i Davidson, North Carolina
Dear Mr. Sadlers
.
In our early discussions about the asbestos dust study being conducted jointly by the Public Health Service and the State Board of Health, we agreed to furnish the results of the air sampling made during the engineering phase. I am enclosing a copy of these results as rece ived from Mr. Howard Ayer who directed the engineering study.
You will notice that both midget impinger and millipore-filter
results are shown. The impinger counts were made with the same equip i ment and procedures that this Section has throughout the years. The
millipore filter procedure has not been used by this Section and repre
sents a new approach for evaluating asbestos dust exposures. To make .
these sampling results more meaningful to you, I am including an excerpt
from a letter from Mr. Ayer:
I
iIi1
'As you know, a major part of our survey was done with membrane filters. For these filters, counts are reported for total
! fibers and for fibers longer than 10 ji. These counts were'
made on Millipore Type AA filters rendered transparent by a
i mixture of 50% diethyl oxylate and 50f% dimethyl phthalate. The counts were made using a k mm (43X) objective with phase
contrast illumination. Where fiber counts are shown on the
same line with an impinger count, these represent simultaneous, i adjacent samples by the two methods. Most other membrane filter
samples at particular operations were taken by personal samplers
worn for periods of 1-2 hours by the individual operator. Gen
eral air samples were taken by a sequential sampler or in an
array of an elutriated and an unelutriated membrane filter, an
elutriated midget impinger and an unelutriated midget impinger.
The elutriated samples, which used a horizontalelutriator of
the British National Coal Board Design ahead of the sampler,
. were merely to develop information as to relative "respirability,"
etc., and are not reported here.
_________________________________________________
fTy "
AFTER JULY 6TH VIE ABOVE SI.ONED MAY BE CALLED DIRECT - AREA CODE 919; 829-7680 or 829-3eo9.
-- -j
"xenoi
t_______________________________ ____________________
co^T I
i'xero^ I CORY ^ ___________________________________________________________________
_________
I
Mr. Sadler Page Two September 3, 1964
There are no official limits established in this country
for asbestos fiber counts. As with dust counting, the count
obtained depends upon the sampling and counting methods. We
have compared impinger counts with companion membrane filter
sample counts, and while there are differences between oper
ations and between similar operations in different plants, it
appears from samples taken so far that fiber counts by the
previously described method are equivalent to impinger counts
of 5 mppcf as follows:
.
Total fibers -- 50/cc Slbers longer than 5 p -- JO/cc libers longer than 10 p -- 15/cc
It should be emphasized that these numbers are averages, based on a limited number of samples in four plants. They are included only to give some significance to the large num ber of fiber counts reported. The fiber counts are a much more direct measure of the asbestos fiber exposure than the impinger dust count, and it might be prudent to suggest addi tional controls when the above concentrations are exceeded even if the impinger counts are within the 5 mppcf.'1
If you have any questions at all about the enclosed data, do not
hesitate to let us know. Someone will be glad to discuss the results
with you.
John C. Lumsden Chief Industrial Hygiene Engineer Occupational Health Section
JCL: ftfls
Enclosure
ec: Dr. W. 1. Wilson, Chief . Occupational Health Section
< XEHO
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' COPY
COPY
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i
Results of Air Sarnies of Karch-April 1?61* Dssfdscc Works, B.X* Fcrtsr Company
Operation
Ifeir^er
Sample #
trapef
Kes&rsne Filter
*"" `u
Tlbars/cc' "r
Sanple # Total 10
Fiber Preparation. / Blender Opersticn-BZ
r"`- 4 Stock Faclrer--Ferscn#
12 fcoi 1*03
General Air--BZ Carding Fixer BZ
.
107
hzi 1x32
l/ Operator BZ
ll* ! 30
U07 , iiQ?
Person.
Boring Hauler - BZ
Ferson. General Air
l0 h21
21
22 23 2h
1.1* 7.2 1.1
0.7
5.7 l*.o 2.2 5.1 2.5 1.3 C.9
2.8 2.5
2.2
2.2 2JZ 0,3
HA 1*02 l*Gl*
10.3 322.1
57.6
2CC 7.3 201 . 35.6
202 12.2
J*12 23.7 h26 12.3
110 3.7
2.3 30.5
0.7
1.5 U.o 3.? 6.1* 2.2
1.0
1*28 ' 32.1* 1*35 23.1
13 29 1*C6 liOS
lao
21.2 21.6 18.6
10.3 12.3
101 7.7 203 10.6 2vk . 2li.2 1*13 13.?
h2h 16.2
la? 50.1 1*22 20.8
1*25 25.7
3*h 5.6
7.6 5.6 6.5
2.8
3.7
h.l 2.8 7.7 i*.3 U.3
15.2 13.1;
. 1C.1
35
22 J*
lt.0
16 2?Jt 14.2
17 7.3 3.3
18 8.2 3.6
1?
12.2
0.6
BOTES 03 A3B2E7IATI0S3
0?cr3cn.n refers to personal samples cn nerbrsno filters
'
*BZ refers to brcntkiri/; sons suspies by companion fcpingcr & cesbrane filter
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rOr.ORf>Of
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'l.v i'.r% *.- -. . . .
*
BarlcLsoa Works* BJE* Porter Conpaxfr
Operation
t'
Cardins (continued) General AJLr (cent.)
Spinning
7 Spinner Bing--B5
Person, Gen. Air
? Tarn Ws^er-Person.
/ <> Doffer Person* Twisting
/ / Twister - BZ .
` Psreoa#
Tjanlngsr .
Ssnple # Eppcf
tesato-ase Pllter
J 11
Fibers/cc
Ssnple Total 10 v*
2$
26 205
9 11
221
lOli 4l6
134
*
1.0 1.0 3.1
6J2 1,0
3.4 4.0 3.7
0.2
20 6.9 1*
208
28 J4
8.1
6 10 32 31 222 4l5
417
412
35.2 20.1
31.6
32J*. -
25 Ji 19.9 r 21.9
23.8
8.8'
4.5 11.7 12.5
6.0 3-0 7.1
11.5
135 . y
219
0.2 3^2
0.1
2*6
218 8*0 2.3
5
? 216 221;
4.2
3.1 11.0
434 4.0
436
436 .
5.1 1.7
440 2*3
4 6
224 223
435
437 439
441 .
17*6
13.4 45 Jk
271.J5i
7.7 10 J. 19.5
9.2 7.3 10.6 3.6
4.5 1.8
2.0 7.6
102 ` 6.3
. 106 "
16.1
.
1.7 6.0
210 . 12.6
2.3
` 213
215
14*6
i' 24.1
3-5
' 4.c
423 ' . 16.9
9.0
' 429 '-
0.5 ` 0.0
r<
JXERO) *copt I
'j 1
r
-$fxCEORPO* I
v<
Deridem Works* H4C. Porter CoEpaegr
ts
15
-\P
Operation
Ihptnger '
Twisting (continued) Doffer - Person. General Air
- ' . .
Sarsple jf sppcf
113 2.0 123 1.9 127 0.9 131 0.U 11$ 0.8
' ,
118 0.?
120 0.?
Winding ' '
-
WLriier <S?ool)-2
too
1.5
28 24 Person. .
)`
WMSKtng '
'
Wearer Tape - SZ .
Person. ' _
103
2# 157 19? 61? 702
0.0 0.6 0.7 0.1 0.7 0,5
Winder---Cop < BZ . Person..
a? / 0.5
Bea&rane Filter Fibers/cc
Ssaple # Total 10 p. +
. 211 10.9
3.5
115 56.5 25.2
125
23.5
b*7
129 2.9 0.6
232 7-6 2J*
117
10.3
2.5
119
16.8
2.9
121
11.3
1.5 .
to 1.6
3 2.7 0.7
27
19.9
9.1
107 9.8 6.5 212 ZL7 It .5 0.7
_
19b 196
198 6lb
701
. 292 293
295
.
636 *
b.2 0.5 OJt 0.1 0.5
0.2 1.7 3*2
2?U 2.6
. f:
2,2 0.1 . 0.0 0.5
0.2 0.6 1.8
r
1.6
' .
`cxoe**or
*..i -
13
Daridscn Weeks, S*S* Farter Catpaiy
Operation
Ssplager '
. Sss^le
' / (>
'
Wearing (continued) Tima Hauler - Perse* (tea* Air
Hlacellanaous ' Janitor - BZ
,,* \'
.
10h 365 361
36 38
Peraesa*
sppcf
0.6 0.0 *2 2.8 0.0
feabrsne Filter
.n !'. '" *1 ^xben-gy&G Tr
Sas^ple # Total 10 |t +
220 $.8 1.9 l< 5*7 14 367 2.0 1.6 363 34 2*1
3? i4*l 22 .1 37 1.2 1*8
3U
25a
9.6
33 74 1*3
^gcHoerpor
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