Document ZE0qD7qKVr7ZkqN2V5QybnBY
FILE NAME: Kaiser Gypsum (KG)
DATE: 1974 Mar 1
DOC#: KG028 DOCUMENT DESCRIPTION: Memo RE Dust from Joint Compound Job Operations with Summary of Gypsum Association Reports
kaiser g y p s u m c o m p a n y , in c
To G. 3. Kirk Ar Oakland
INTER-OFFICE MEMORANDUM d *tc tore h 1, 197
C o p ic i to
J. W. Blewett (via G3K) T . Y. Smith
H.
A.
L.
F.
RWaeii lghtnan;
SUIJCCT DOST FROM JOINT CQ4PGUI'iD JOB OPERATIONS
fbom
AT
j . ns-/ Sheahan Antioch R 4 D
FL A.1.0
00022
We have received a group of three reports from the Gyosum Association aSnda ^saSndd_.W,g oSft1jooi?nittaSciomSpoSuSnad(1s" odnl tUypj"iCcaaUlS jdobus".ts aerated duri^ng miminSg
The overall summary by the testing agency states, "The1-- was evidence exposure of workers to airborne concentrations of asbestos and S t s +.+%
a*ed~ d u r ' ~ th; 1
th! higi CQ-- -.tra-.ions of total dust g-oerand sanding activities, it is clear that con*-cl
c L S h S ^ r L f s i l f ^ P r o v i d e an inherent control of t L soi a `''-- 1 aSwwS^os ana silica problems as well."
I t l n ^ 2 J S p2rt dClS With dr? " d Premix'products from the other five d t -s 'c S ? - * companies, with ICC materials not included. The dust sam-
f c "aad-*"^nd ip" " -?* 77 that reliable test3 for asbestos could not be mad_, and only siliceous dust values are reported.
two 'cfCthd
CVerS 3 recheci
ry and premix products from
two of tne above companies on siliceous dust values.
S c o i f r e o c r t ! ^ CVerS aSbeStS duSt from the Products used for the
\ summary of the test data is attached, cur own tests on our own products.
ACTION PCTTavT).
Also attached is a summary of
1) Review and recommendation a%, to whether asbestos warning labels may
t'&j
tri! ; l'riatf'? * e .re5Cve? fron our premix products. The law states " " .ta b -1 13 required where asbestos fibers have been modified
^ a_
agent, coating, binder, or other material so that during
* csscnably' foreseeable use, no airborne concentrations of asbes-
^ exce3s
*he prescribed exposure limits will be
toISaf l ; , . 0 u r >cc.:a?ar.y_is t h e _only major company carrying the asbes& on its prtaix ar.d it is costing us business.
2)
i a v ! r =w d*:i0!! a! t0 ccr-?ar< 3 position on what is next step to be _/ v. - Gypsum Association Study Committee on this project
f / a '--
JSS/sc.... 5 At tachr.ent
j ,
a S"
___. 0:1 rscord. ^ 4fQa,vyoAr Uoif* placing t-hnee daSsub6wS >t.:c s c:: ai* cass and pails of joint compound. _______
P L A IN T IF F 'S E X H IB IT /ip
PLTF 0495
]I.s/jI N vl a
r.~i miix?
SUMMARY OF GYPSUM ASSOCIATION RxPORTS
ESSSU^SKi
'
September 1973 tests - Siliceous Dusts (asbestos dust data not reliable)
Mixing of 5 dry powder jcint compounds (not including Kaiser)
Worker exposure (breathing zone):
8 hr TWA OSKA Limit *-*
Total dust - S.9 to 21.6 mg/cu m
Respirable dust - 1.3 to 9.1 mg/cu m
*
General area exposure:
Total dust - 10.3 to 34.0 mg/cu m Respirable dust - 0.8 to 2.6 mg/cu m
3.1 to 9.7 *
Sanding of joints from 5 dry powders and 5 prsnixes
Worker exposure (breathing zone):
Total dust - 72.5 to 2k4.4 mg/cu m Respirable dust - 1.5 to 5.6 mg/cu m
2.1 to 15.0 *
General area exposure:
Total dust - 27.7 to 136.7 mg/cu m
k.O to 15.0
Respirable dust - L.L, to 23.0 mg/cu m
0.7 to 5.0
* net calculable because samples too small to analyze for free silica content needed
for the calculation. Respirable dusts are specific size fractions of the total
dust.
-
*-* The OSRA limit amounts vary* because they are dependent on the amount cf silica
present.
ffOT" 5 :
1) There eras no significant difference among dust levels generated by sanding joints which used dry powder compounds versus those which used premix com pound s .
2 ) No one por.ufacturar's product was significantly closer to complying with
QSH A limits than were the others. 3) It is said that the individual worker is unlikely to have more than 2 hrs.
direct exposure to mixing or sending each workday.
PLTF 0496
SZCCV.V REPORT
StR.giARy Of GYPSUM ASSOCIATION REPORTS
November 1973 tests - Siliceous Dusts
Mixing of two dry powder joint compounds Worker exposure (breathing z c n e ): Total dust - 11.7 and 33.8 mg/cu m Respirable dust - <8.5 and 6.9 mg/cu m General area exposure:
8 hr TWA OSEA Limit **
#
*
Total dust - 121.6 and 98.3 mg/cu m Respirable dust - 13.8 and 12.2 mg/cu m Sanding of joints from 2 dry powders
6.7 and 5.4 1.3 and *
Worker exposure (breathing zone):
Total dust - 1G'9.5 and 196.3 mg/cu m Respirable dust - 3.3 and 2.0 mg/cu m General area exposure:
8.8 and 5.C *
Total dust - 96.4 and 76.5 mg/cu m Respirable dust - U . 6 and 7.6 mg/cu m Sanding of joints from 2 premixes
8.3 and 4.0 3.3 and 1.9
Worker exposure (breathing z o n e ) :
Total dust - 69.2 and 87.3 mg/cu m
Respirable dust - 3.9 and 6. 4 mg/cu m
.
9 .4. and 10.0
*
General area exposure:
Total dust - 54.9 and 91.3 mg/cu m
Respirable dust - 4.9 and 7.9
5.6 and 1.5 * and 3.1
* Not calculable because samples too small to analyze for free silica content needed for the calculation.
"*
OSHA limit amounts vary because they are dependent on the amount of silica
present.
i v ^3 sa.d that the individual worker is unlikely to have more than 2 hrs.
direct exposure to mixing or sanding each workday.
PLTF 0497
r-n i[ .)]
SUi.OiARY OF GYPSUM ASSOCIATION REPORTS
THIRD REPORT
November 1973 testa - Asbestos Dust (fibers longer than 5 micrometers)
O S H A Standard - continuous exposure
5 fibers/cc
OSHA Standard - peak exposure
fSt Worker exposure (breathing zone):
10 fibers/cc
Mixing: 1st dry compound
31.4 fibers/cc
M
2nd dry compound
7.6 fibers/cc
Sanding:
10 min, samples
30 min, samples
avg
aliquoted 4 redeposited
1st dry compound
39.4 fibers/cc
2nd dry compound 1st premix 2nd premix
4.4 fibers/cc 4.2
10.8
14.8
11.1
9.7
6 of 13 sanding tests (10 min. samples) indicated concentrations in excess o f 5 fibers.
2 of 13 sanding tests (10 min. samples) indicated concentrations in excess
of 10 fibers.
.
NOTE:
1) It is said that the individual worker is unlikely to have more than 2 hrs. direct exposure to mixing or sanding each workday.
: l
PLTF 0498
RZZULTf o f TZ5T WITH KCC COMPOUNDS BY UNION C. Asbestos Bust (fibers longer than 5 micrometers)
Worker exposure (breathing zone): Mixing Joint compound with drill mixec Mixing finishing compound with potato masher Sending joint done with Premix lopping Sanding joint done with Premix Dual Purpose Sanding Joint done with Finishing Comoound
fibers/cc 54.6 66.5 1 4.3
1.1 2.8
MOTS:
Since in no case the sampling time was longer than 2 minutes, these datasshould
be used only as general guides to indicate gross relative differences.
~
PLTF 0499