An Accelerated Aging Test at Room Temperature

Abstract Accelerated aging in an oven, heated to a more or less elevated temperature, is one of the most valuable tests at the disposal of the rubber technologist for examining the behavior of different compounds in practical use. Geer in 1916 described a now well-established oven test at 160° F., he and Evans giving more details in 1921. In this latter paper they stated in particular that with proper use of their test, one day in the oven could be taken as equal to six months of natural life. Other attempts to foretell more exactly the natural life of rubber from accelerated aging data have proved useless. The figures obtained for life at different temperatures are not always in the same ratio, so that calculation of the corresponding times at room temperature depends on the temperature used in the heat test. This has been shown in experimental work of many authors, particularly Williams and Neal, Milligan and Shaw, Bierer and Davis, and Somerville and Russell. The matter has been thoroughly discussed in a “Symposium on Aging” presented before the New York Rubber Group of the American Chemical Society in 1929.

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Study on the Material Life of OMEGA Water-Stop

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.838-841.162 ◽

2013 ◽

Vol 838-841 ◽

pp. 162-165

Author(s):

Yong Huan Luo ◽

Zheng Lin Feng ◽

San Meng Wang

Keyword(s):

Stress Relaxation ◽

Room Temperature ◽

Accelerated Aging ◽

Comprehensive Analysis ◽

Material Life ◽

Design Life ◽

Wlf Equation ◽

Accelerated Aging Test ◽

Aging Test ◽

Chloroprene Rubber

In this paper, through the study on physicochemical properties of chloroprene rubber which used in immersed tube tunnel, and comprehensive analysis of the stress relaxation process of aging, together with the analysis of IR spectra of chloroprene rubber, and the accelerated aging test data, we forecast the lifetime by using WLF equation method at the room temperature, and judge that chloroprene rubber can meet with the requirements of the design life of 120 years.

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Aging of Rubber in the Oxygen Bomb at Room Temperature

Rubber Chemistry and Technology ◽

10.5254/1.3540176 ◽

1943 ◽

Vol 16 (4) ◽

pp. 924-925

Author(s):

J. R. Scott

Keyword(s):

Tensile Strength ◽

Oxygen Concentration ◽

Room Temperature ◽

Accelerated Aging ◽

Natural Aging ◽

Tensile Tests ◽

Oxygen Bomb ◽

Vulcanized Rubber ◽

Accelerated Aging Test ◽

Aging Test

Abstract The work described below was carried out as a first step in determining whether an oxygen-bomb test at room temperature could be used as an accelerated aging test for unvulcanized rubber compositions, e.g., as used on surgical and adhesive plasters and for combining shoe fabrics, because a high-temperature test is unsatisfactory in such cases, owing to the melting of the compositions. The only infallible way of assessing the value of an accelerated test for such compositions is by comparison with natural aging, but as this is a very lengthy process and as the deterioration is difficult to measure quantitatively, it was decided to make preliminary tests on the effect of high oxygen concentration at room temperature by using vulcanized rubber. Although the results proved to be negative so far as the original purpose of the work was concerned, it is considered of interest to place them on record in view of the prominence given in some papers on aging to the relationship between oxygen concentration and rate of oxidation and deterioration of rubber. A mix composed of rubber 100, sulfur 3, zinc oxide 5, stearic acid 1, and diphenylguanidine 0.75, was vulcanized for 30 minutes at 153° C. Tensile tests, using standard ring-specimens and the Schopper machine, were made on unaged specimens and on specimens that had been aged (1) in an oxygen bomb at 300 lb. per sq. in. oxygen pressure and at room temperature (about 10° C), (2) in a Geer oven at 70° C. Four rings were used for each test, the tensile strength and breaking elongation figures quoted being the average for the two rings giving the highest tensile strength, and the figures for the elongations at constant loads the average of all four rings.

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