Outline of Tentative Standard Laboratory Procedure for the Preparation and Physical Testing of Rubber Samples

1930 ◽  
Vol 3 (2) ◽  
pp. 179-184
Keyword(s):  
United States ◽  
Research Work ◽  
American Chemical Society ◽  
Chemical Society ◽  
Standard Laboratory ◽  
Laboratory Procedure ◽  
Rubber Compounds ◽  
Physical Testing ◽  
Physical Tests ◽  
Research Chemist

Abstract THE accompanying report on the work of the Physical Testing Committee, Rubber Division, American Chemical Society, marks the conclusion of the research work on the standardization of physical tests of rubber, which have been conducted since early in 1927, at the rubber laboratory of the Bureau of Standards, Washington, D. C., under the sponsorship of the Rubber Manufacturers Association, the Rubber Division, A. C. S., and a number of rubber companies. The original committee was formed in October, 1926, by R. P. Dinsmore, chairman of the Rubber Division at that time. F. E. Rupert, research chemist at the Fisk Rubber Company, was chosen to conduct the research work. J. E. Partenheimer, also of Fisk, was chairman of the first committee, and was later succeeded by W. A. Gibbons, of United States Rubber Company, who in turn resigned last year and was succeeded by A. A. Somerville, of R. T. Vanderbilt Company, who has remained as chairman up to the present time. Two progress reports were made by the committee, one on the “Importance of Temperature and Humidity Control in Rubber Testing,” read at the April, 1927, Rubber Division meeting at Richmond, Va., and a later report on “The Effect of Humidity and Temperature on the Ability of Rubber Compounds to Resist Abrasion,” presented in September, 1927, at Detroit. This report was later amplified and released for publication in December, 1927.

Practical Method for Obtaining Dry Air for Humidity Control in a Rubber Laboratory

1929 ◽  
Vol 2 (2) ◽  
pp. 318-322
Author(s):  
F. S. Conover
Keyword(s):  
Relative Humidity ◽  
Laboratory Testing ◽  
American Chemical Society ◽  
Practical Method ◽  
Chemical Society ◽  
Testing Laboratories ◽  
Physical Testing ◽  
Cent Relative Humidity ◽  
The Subject ◽  
Short Time

Abstract THE effect of relative humidity on rubber-testing has been the subject of much recent investigation. String-field and Conover and Depew have published papers on this subject. The last-named authors recommended that the rubber be stored in dry cabinets before milling, between milling and vulcanization, and between vulcanization and testing, at a temperature of 75° ±5° F. A short time later the Physical Testing Committee of the Rubber Division of the American Chemical Society recommended that all laboratory testing be carried out at 45 per cent relative humidity and 82° ±5°F. While both methods have undoubted merit, it was believed that for physical testing laboratories, particularly such as this one, zero humidity was both more conducive to reliable results and easier to maintain. Accordingly, equipment was installed for maintaining zero humidity and its performance has been consistently good. Since several of the larger rubber laboratories have shown interest in the equipment, it has been decided to present this description of the installation and its operation.

Report of the Raw Rubber Specifications Committee

1929 ◽  
Vol 2 (2) ◽  
pp. 335-339
Author(s):  
Ellwood B. Spear ◽  
C. R. Boggs ◽  
H. E. Simmons ◽  
H. L. Trumbull ◽  
N. A. Shepard
Keyword(s):  
American Chemical Society ◽  
Chemical Society ◽  
Stress Strain ◽  
Physical Testing ◽  
Complete Report ◽  
The Subject ◽  
Satisfactory State ◽  
Considerable Detail

Abstract AS INTIMATED in a previous report of the Committee presented at the St. Louis meeting in April, 1928, a temporary procedure was adopted in order to ascertain whether or not the five laboratories represented on the Committee could obtain reasonably comparable stress-strain relationships using the same batch of rubber. A complete report is appended in which the procedure is outlined and the results of each laboratory are given in considerable detail. After careful deliberations the Committee has concluded that the testing of raw rubber is not in a very satisfactory state. It therefore makes the following recommendations: (1) The testing of raw rubber should be made the subject of thorough investigations. (2) The work should be undertaken by a Physical Testing Committee, preferably under the jurisdiction of the Rubber Division of the American Chemical Society.

Importance of Temperature and Humidity Control in Rubber Testing. Progress Report of the Physical Testing Commitee, Rubber Division, A.C.S. (Dated Dec. 8, 1927)

1928 ◽  
Vol 1 (1) ◽  
pp. 182-191
Author(s):  
J. E. Partenheimer ◽  
E. R. Bridgwater ◽  
D. F. Cranor ◽  
E. B. Curtis ◽  
J. W. Schade ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Absolute Humidity ◽  
Rubber Compounds ◽  
Physical Testing ◽  
Temperature And Humidity ◽  
Cent Relative Humidity ◽  
Physical Tests ◽  
A Minor ◽  
Mixed Stock ◽  
Testing Room

Abstract The purpose of the work which this committee has undertaken is to determine the effect of the variables which influence the results of physical tests on rubber. The investigation has proven that variations in temperature which may occur from day to day in an uncontrolled testing room may affect the physical tests to as great a degree as a 25 to 40 per cent change in the time of cure, while relative humidity affects the results to only a minor degree. Furthermore, variations in the absolute humidity of the room in which the unvulcanized rubber is stored between the time of mixing and the time of curing may affect the tensile strength and modulus of rubber compounds to as great a degree as does the temperature after curing. It is, therefore, apparent that laboratory tests which are conducted under uncontrolled conditions of temperature and humidity may give highly erroneous results and may even give misinformation which is worse than no information at all. The committee, therefore, recommends that mixed stock prior to curing and cured stock prior to testing be conditioned for not less than twenty-four nor more than twenty-eight hours at 82 deg. F. ± 2 deg. and 45 per cent relative humidity ± 3 per cent and that the testing room be maintained at 82 deg. F. ± 2 deg. If a temperature of 82 deg. F. cannot be maintained for conditioning the mixed stock prior to curing, the committee recommends a relative humidity corresponding to the temperature used which gives an absolute humidity equal to that obtained under the former conditions. The temperature of the testing room should be controlled within the above stated limits, but it is not necessary to control the humidity of the entire room. A small conditioning cabinet in which the standard humidity is maintained has been found to be sufficient.

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