How to read this table ? [Problem with insctruction from ASTM D471)

[Rizkyffq]

Hello guys, recently i have an issue to read this table

So, we are actually having a soak test for V-ring (rubber material), and before we got the method of test from ASTM D471-04 where this standard explains "practice Standard Test Method for Rubber Property—Effect of Liquids1"
we want to know, the temperature and how long the time of immersion/soaking V-ring (rubber) but we confused when we read table above (frowm ASTM D471-04), maybe someone may help us ? because it is strange if we read that table horizontally then normal temperature (23 ^oC) and 225 ^oC will having same period of immersion, 2998 hours it doesnt make sense

for additional info, this is the written instruction

 

[mk3223]

It looks that the test temperatures and immersion periods are two separate factors to be specified for the testing of the product and used for the report.

 

[jdonville]

Agree with mk3223. Pick a temp range and an immersion period based on anticipated service and material properties of the rubber (see 5.1 and 5.1.3).