Table VII.
Properties of Mineral Pigment-Reinforced Philprene VP-25 and Philprene 1 500 Rubbers Basic Recipes" Philprene VP-25 Elastomer
100
Pigment
Philprene 1500
100
Variableb
100
Variableb
. a .
Philblack 0 Zinc oxide
50 3 1
Stearic acid FIexamine
0 . .
3 3
100 . . e
50 3 1
1
Philrich 5
10 1.75
Sulfur Sulfasan R NOBS Special Altaxc
1.25
... ... ... ...
.*.
... ... ...
DOTG~
Triethanolamine Santocure
...
0.75
0.75 1.5 1.0
...
...
... ... ... ... 1.1
80' F.
300%
Filler
modulus, lb./sq. in.
Tensile, Ib./sq. in.
Compounded
Elongation,
%
Resilience,
AT, O F.
% '
Hardness
Scorch at 280' F., Min.
12.1 6.6 32.4 2.2
65 70.5 58.5 64
45.5 64 23.5 27.5
19 16 18.5 18
26.5 23.3 57.6 7.1
63 73 59 59.5
49.5 78.5 23.5 34.5
16 18 10 22
Abrasion
Life, M
Loss, Cc.
19 9 15 8
6 9 6 17
Flexures
Mooney
Mooney at 212' F. (MS - I1/z)
Flex
Shore A
Philprene VP-25 Hi-Si1 101' Hi-Si1 233e Dixie ClayC Philblack 0
1190 1530 1240 1830
2500 3620 1940 3210
535 560 480 440
45.9 53.0 41.2 62.8
550 450 500 1250
1990 2775 2320 3320
610 690 620 590
54.7 78.7 58.5 60.8
67.8 66.7 69.3 58.4
Philprene 1500 Hi-Si1 101 Hi-Si1 233 Dixie Clay Philblack 0
62.3 51.7 62.7 60.7
Cure, 30 minutes at 3 0 7 O F. Adjusted to obtain a volume loading of 27.8 parts per 100 parts of rubber. R. T. Vanderbilt Co., Inc.
e
Did-tolylguanidine. Columbia-Southern Chemical Corp.
minute a t 210' F. Keported as thousands of flexures to complete break. ASTM D 676SHORE A HARDNESS. 55T, Shore Durometer, Type A. ABRASION. Modified GoodyearHuber angle abrader. MOONEYSCORCH.ASTM D 107755T, Mooney viscometer, large rotor. Scorch is minutes to 5-point rise above minimum Mooney. COMPOUNDED MOONEY.ASTM D 927-55T, Mooney viscometer, small rotor, 212' F., 1.5 minutes. EXTRUSION.No. l / * Royle extruder with Garvey die ( 3 ) . FREEZEPOINT. ASTM D 1053-54T, Gehman method. Freeze point is intersection of vertical portion of curve with temperature axis. OZONERESISTANCE. Exposure to ozone concentration of 35 parts per hundred million of air under static condition, 120' F. and 25y0 elongation; Test specimens 0.5 X G X 0.080 inches. OVEN AGING. Geer oven, forced draft, 212' F. for designated time.
Galloway who supervised the testing of the compounds discussed. Appreciation is also expressed to P. G. Carpenter and R. S. Hanmer for their helpful suggestions. literature Cited
Adams, J. W., Reynolds, J. A., Messer, W. E., Howland, L. H., Rubber Chem. and Technol. 25, 191 ( 1 952). Buist, J. M., Trans. Inst. Rubber Ind. 26, 192 (1950); 24, 483 (1951). Garvey, B. S., Jr., Whitlock, M. H., Freese, J. A., Jr., IND. ENG.CHEM. 34, 1309 (1942). Garvey, B. S., Jr., Yochum, D. W., Morschauser, C. A., Rubber Age ( N . Y . ) 73, 361 (1953). IND.ENC. CHEM.44, 695-861 (1952). Kraus, G., Rubber World 135, 67, 254 (1956).
Schulze, W. A., Reynolds, W. B., Sperberg, L. R., Troyan, J. E., Ibid., 117, 739 (1948). Sperberg, L. R., Svetlik, J. F.,Bliss, L. A., IND. ENG.CHEM.41, 6641 (1949).
Acknowledgment
Svetlik, J. F., Railsback, H. E., Biard, C. C., India Rubber World 129, 617
The authors wish to thank R. C. Wheat who prepared the figures and checked the data, and W. S. Howard and E. H.
Svetlik, J. F., Railsback, H. E., Biard, C. C., Louthan, R. P., IND. ENG. CHEM.47, 352 (1955).
1050
INDUSTRIAL AND ENGINEERING CHEMISTRY
(1 954).
(11) Svetlik, J. F., Railsback, H. E., Cooper, W. T., Zbid., 48, 1084 (1956).
RECEIVED for review May 31, 1956 ACCEPTED November 15, 1956 Division of Rubber Chemistry, ACS, Cleveland, Ohio, May 31, 1956.
Correction In the article on "Uranium from Gold Wastes" [William Q. Hull and Ewen T. Pinkney, IND.ENC. CHEM.49, 1 (1957)], the following changes should be made : On page I , the second portion of the caption should read : to Uranyl Sulfate Solutions
O n page 2, the 25th line of column 1 of Table I should read: Vaal Reefs Exploratory and Mining Co. Ltd. O n page 10, column 2, the first sentence of the third paragraph should read: The sulfuric acid plant a t Daggafontein employs the conventional contact process using pyrite as raw material (9).
