Migration of Materials during Accelerated Aging by the Oxygen Pressure Method

1952 ◽  
Vol 25 (2) ◽  
pp. 331-338
Author(s):  
Marion B. Fackler ◽  
John S. Rugg
Keyword(s):  
Oxygen Pressure ◽  
Accelerated Aging ◽  
Reliable Test ◽  
Oxygen Bomb ◽  
Pressure Method ◽  
Test Conditions

Abstract It has been definitely established that various materials migrate and that the magnitude of the resulting error is significance Migration takes place whenever unlike stocks are aged together in a bomb. The most reliable test conditions prevail when separate bombs are used for individual stocks. It is recommended that specifications for oxygen-bomb aging be changed. The change should specify the use of individual bombs.

Migration of Materials During Accelerated Aging By Oxygen Pressure Method

1951 ◽  
Vol 23 (11) ◽  
pp. 1646-1649 ◽  
Author(s):  
Marion Fackler ◽  
John Rugg
Keyword(s):  
Oxygen Pressure ◽  
Accelerated Aging ◽  
Pressure Method

The Effect of Specimen Thickness on Rate of Artificial Aging

1932 ◽  
Vol 5 (4) ◽  
pp. 698-704
Keyword(s):  
Accelerated Aging ◽  
Mass Action ◽  
Specimen Thickness ◽  
Oxygen Bomb ◽  
Aging Period ◽  
Bomb Test ◽  
Different Types ◽  
Satisfactory Answer ◽  
Theoretical Considerations

Abstract From time to time the question of the effect of thickness on the rate of deterioration of rubber samples subjected to accelerated aging tests, particularly the oxygen-bomb test, is raised. Apparently little experimental work has been done, and no satisfactory answer has yet been given. According to the well-known laws of mass action, the rate of deterioration should slow up with increasing thickness of rubber, and one might expect thin articles to deteriorate further, in a given bomb-aging period, than similar articles of heavier gage. Nevertheless, it is tacitly assumed that variations in thickness have practically no effect—and for small variations this assumption is reasonable considering the oxygen concentration used; or possibly no assumption is made, and the aging tests are just performed mechanically without regard for theoretical considerations and possibilities. The fact that the oxygen-bomb is used largely for comparing the aging quality of similar articles, usually of comparable gage, has doubtless tended to keep the question of the influence of thickness dormant. Again, in the testing of laboratory compounds, most laboratories have standardized on a uniform thickness of cured slabs (0.075″), so that the question of thickness in this type of work does not come into the picture. Occasionally, however, it may be desirable to compare the bomb-aging behavior of articles of quite different types, and when in such cases there is a large difference in thickness, the validity of the comparison may be called in question.

Influence of Exposing Vulcanized Rubber to Light on Its Subsequent Aging in the Dark

1944 ◽  
Vol 17 (1) ◽  
pp. 216-220
Author(s):  
J. R. Scott
Keyword(s):  
Tensile Strength ◽  
Accelerated Aging ◽  
Subsequent Aging ◽  
Oxygen Bomb ◽  
Vulcanized Rubber ◽  
Effect Of Light

Abstract The present experiments confirm the observations of Morgan and Naunton by showing that exposure of vulcanized rubber to light may affect the results of oxygen-bomb aging tests made some days, or perhaps even weeks, afterwards. They show also that a few days' exposure to even diffused daylight may noticeably lower the tensile strength of unaged rubber. With normal, i.e., not transparent, rubbers the effect of light on subsequent aging is small, and indeed does not seem to be noticeable at all in relatively slow aging tests, such as that in the Geer oven. Nevertheless, it is clearly advisable, as a precaution, to avoid unnecessary exposure to light of rubbers that are to be subjected to accelerated aging tests.

Improvement of Emission Intensity for Near-infrared-emitting Ca14Zn6Al10O35:Mn4+Phosphor by Oxygen-pressure Method

2016 ◽  
Vol 45 (9) ◽  
pp. 1096-1098 ◽  
Author(s):  
Takuya Hasegawa ◽  
Sun Woog Kim ◽  
Takeshi Abe ◽  
Shota Kumagai ◽  
Ryota Yamanashi ◽  
...  
Keyword(s):  
Oxygen Pressure ◽  
Emission Intensity ◽  
Near Infrared ◽  
Pressure Method
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