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LABORATORY REPORT
15 1847
THE DOW CHEMICAL COMPANY
MIDLAND. MICHIGAN
PLASTIC MATERIALS AND PRODUCTS TECHNICAL SERVICE AND DEVELOPMENT
TITLE:
DEVELOPMENT OF A LATEX BINDER FOR BROWN COMPANY ASBESTOS (INTERIM I)
SUMMARY: 'Several Dow latexes were screened as asbestos binders for the Brown Company.
The immediate objective was to match a control latex which Brown had supplied
us with. Three latexes were found which were equal to or better than the
Brown latex in our testing program. However, Brown's evaluation of these
0 \
latexes showed them to be worse than the control, and only one of the three
r v came close to meeting Brown's minimum specification. It was found that Brown added reactive ingredient "X" in their evaluation which evidently changed the
L end-use properties of our latexes. Further efforts here will be in evaluating
0 latexes with reactive ingredients, if necessary, to meet minimum specifications
set forth by Brown Company.
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ENTRAL RESEARCH INDP)
PLAINTIFF'S EXHIBIT
DISTRIBUTION: R. L. Zimmerman, 433
*S. R. Vranish, 433 Lab File Data File ^>CRI (4L. M. E. Kelly, 433 M. E. Pruitt, B-1210, Freeport J. Johnson, Sarnia W. L. Gold, Coral Gables
DOW-1026
L. P. Benedict, 433 Denis Wilcock, Horgen M. G. Head, Melbourne * R. E. Baker, 433 R. C. Simon, Pittsburg, Calif. K. G. Scheffel, 2020 C. L. Dibert, 635 M. A. Gay, 414 TS&cD Coating Section Heads (16)
O IN) OO Ci
9
X?
REPORT NUMBER
BP-17 0 (Interim I)
FOR
Brown Company
REPORT BY
M. A. Bishop YV[ Q, jb
FORM C-693; Printed In U.S.A. 3-68
Full Report
DEPARTMENT NAME
Designed Products - Paint & Bldg. Prod. Sect
DATE
April - 1969
approved
{/Jfiv
R. L. Zimmerman
*
THE DOW CHEMICAL COMPANY MIDLAND, MICHIGAN
TECHNICAL SERVICE AND DEVELOPMENT LABORATORY REPORT
' ST02837S5
PROBLEM NUMBER: BP 170 Interim I
TITLE: DEVELOPMENT OF A LATEX BINDER FOR BROWN COMPANY ASBESTOS (INTERIM I)
STATEMENT OF PROBLEM:
We have received a sample of the present latex being used by the Brown Company as a binder for their asbestos. We have been told by the Sales Department (efforts of Bill Baker and Mike Moss) that if we can match this product, we can have 3 MM pounds worth of business. This report summarizes our efforts to match this product.
SUMMARY:
Several Dow latexes were screened as asbestos binders for the Brown Company. The immediate objective was to match a control latex which Brown had supplied us with. Three latexes were found which were equal to or better than the Brown latex in our testing program. However, Brown's evaluation of these latexes showed them to be worse than the control, and only one of the three came close to meeting Brown's minimum specification. It was found that Brown added reactive ingredient "X" in their evaluation which evidently changed the end-use properties of our latexes. Further efforts here will be in evaluating latexes with reactive ingredients, if necessary, to meet minimum specifications set forth by Brown Company.
PROCEDURES:
Sample Preparation -
Fiber dispersions with a 2 1/2% consistency were prepared by blending for 1 minute at low speed on a Waring Blender. For the 10" x 12" sheet mold, the following mix was prepared three times for each sheet.
Asbestos Water
20 gms. 780 gms.
Wherever deposit temperature is indicated in data sheets, it is additionally notable that water in any stage of the preparation is also at the indicated tempe rature.
The three fiber slurries are combined in a 2 1/2 gallon pail before addition of the latex. The following latex formulation is added at this point and the latex modified slurry is given mild agitation for a total of 3 minu' 's.
BP 170
Page 2
Weight in. Grams
Latex Anti-oxidant Water
Dry
10. 0
0. 08
Wet
0. 8
To Make 100 Gms.
Alum, is then added in the quantities shown below and the treated mix is agitated for 1 minute.
Alum (5%)
Dry . 75 Gms.
Wet 15.0 Gms.
The completed mix is then transferred to the Williams sheet mold and additional water is added such that the final consistency is approximately 0. 6% based on fiber.
The sheet mold is then drained and the number of seconds from when first released till complete is recorded as drainage time. The samples were removed from the sheet mold and pressed between blotter paper on the Williams Hydraulic Press. Following this the sheets were dried for 20 minutes at 230F in a recirculating air oven.
Tensile Strength The samples were evaluated on an Instron Tensile Tester using a crosshead speed of l"/min. Tests were run at room temperature, 350F and400*F. The samples were conditioned for 3 minutes at the elevated temperatures before testing.
Stiffness The tests were performed on the Taber Stiffness Tester using the 500 unit weight.
Tear Strength The values were obtained on the Elmendorf Tear Tester and are reported as uncorrected scale readings.
Water Absorption Samples were immersed for 1 hour in distilled water at room temperature. Results are reported as follows:
(Final Wt.) - (Original Wt,) ,nn % Absorption =
Original Wt.
BP 170
Page 3
tN tm ii,
DISCUSSION AND RESULTS:
From an analysis of the latex submitted by the Brown Company (AL Number S 83-742 and S 83-7 53), several Dow latexes were picked for screening in the Brown asbestos procedure. Chart II summarizes the results of this first screening. It was found, at this time, that the drainage of the Brown latex had to be slowed down in order to make an asbestos sheet from it. It is common in this industry to have to slow down drainage and Darvan is a common surfactant for that purpose. From this initial screening, it appeared that several of our latexes would be as good as the latex Brown was buying. Chart I gives the description of the Dow latexes tested.
Since the Brown Company had indicated to us that the drainage was particularly important and that it got very cold in New Hampshire, it was thought desirable to try the latexes at 60F drainage. Also, there was some question as to whether they were using 14. 4% binder level (10. 0 parts latex on 60 parts asbestos) or 13. 0% (9. 0 parts latex on 60 parts asbestos). For this reason the data summarized on Chart III was obtained. Since DL 636, DL 880, DL 512K all slowed down considerably with the lower temperature, the decision was made to continue work further with DL 840 and DL 881. Also these two latexes seemed to resemble in the most ways the Brown control latex. SD 199 (data only given for 14. 4% binder) actually was tested much later, but its data is presented here for the sake of comparison. SD 199 was also selected for further testing.
Chart IV summarizes the data on the three candidate latexes CX-7004 (DL 840 NA), CX-7005 (DL 881 NA), and CX-7006 (SD 199). These three samples looked as good as or better than the Brown control under the conditions we were able to test, and they were sent to Brown Company for evaluation.
Chart V is the data given to us by the Brown Company on the evaluation of these latexes. As can be seen, none of these met their specifications and all the results were worse than the control. It was found out, at this time, that in their procedure ingredient "X" was added. It was obvious that the Brown latex responded to the reactive ingredient and none of the Dow latexes did . Unfortunately, we were refused information as to what that ingredient was.
BP 170
Page 4
The conclusion at this time must be that we have not found a match to compete in this business at Brown Company. Since Brown is still willing to evaluate candidate latexes which we might submit, further work may be anticipated. Work with latexes which will be responsive to reactive ingredients will be emphasized. Also, latexes which are similar to CX-7005 will be considered as this was close to meeting the minimum specifications. It will be necessary to meet these specifications either with or without reactive ingredients in order to effectively compete. Several Asbestos Sheets were obtained using the control latex, the properties of which will serve as a guideline to what will be needed.
m c e z o is .
DL 636 V
DL 636 DL 881 DL 880 DL 840 DL 512 R DL 512 K DL 512 U CX - 3580 SD 199
CHART I DOW LATEXES TESTED
A special DL 636 containing an extra amount of Versenol 120 and made regularly at Allyn's Point (L-4-93)
L-l-3416
DL 881 Without Antioxidant L-4-01
DL 880 Without Antioxidant L-4-02
DL 840 Without Antioxidant L-1-375
L- 1-4521
L-l-7061 "c.
DL 512 Unformulated
L- 1 -1067
L-4-02
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