Accelerated Ozone Test for Predicting Outdoor Effectiveness of Ozone Protective Waxes in SBR
| Autor: | S. Palinchak, P. B. Stickney, W. J. Mueller |
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| Rok vydání: | 1964 |
| Předmět: | |
| Zdroj: | Rubber Chemistry and Technology. 37:990-1005 |
| ISSN: | 1943-4804 0035-9475 |
| DOI: | 10.5254/1.3540395 |
| Popis: | Accelerated laboratory and outdoor aging studies were made to establish base lines leading to the development of an accelerated test method which could be used to predict the efficiency of ozone-protective waxes under static conditions. The effect of several variables on the rate of ozone cracking in an ozone chamber was determined, and it was found that exposure temperature was the most critical variable. The type of recipe and time between curing and stretching the samples were also found to be important in arriving at a suitable test procedure. The ozone concentration, although important, was found to be less critical than some of the other variables. An accelerated test method is proposed for determining the effectiveness of ozone-protective waxes. Two outdoor aging studies were made to determine the reliability of the accelerated test in predicting the protective effectiveness of waxes. For a limited number of waxes, it was found that a good correlation exists between the results of the two methods, provided that correct temperatures are used. The best correlation was obtained between dumbbell and bent loop specimens exposed outdoors and the accelerated test if the accelerated test was run at 60° and 120° F. The optimum conditions for correlating between the accelerated test and cable exposed outdoors involved carrying out the accelerated test at 60° and 105° or 110° F. |
| Databáze: | OpenAIRE |
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