foaming tendency ASTM D892

jessMember

does anyone can tell me what we can get from foaming tendency ASTM D892 result? if the result is present in 20/0 ML, what does the figure indicate? 20 meaning that 20ML foam is form after 10min settling time, but what mean by zero?furthermore, why this test method have 3 sequence?what is the acceptable result which mostly apply in lubricant?
it seem like a lot of ?? come out in my mind.

thank you for you valuable answer.

3/7/066:16 PM

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nnkmenonMember

Almost all the lubricating oils are incorporated with antifoam agents to ensure that no lubrication failure due to foam formation when it is in service.ASTM D 892 test procedure is to measure this foaming tendency of the oil.This test includes three sequences and each sequence has two portions.

Sequence - 1 at 24°c(sample 1)

Sequence - 2 at 93°c (sample-2)

Sequence - 3 at 24° (sample - 2 again)

1st portion - air blowing period for 5 minutes
2nd portion - settling period for 10 minutes

In your case,20/0 ml means,20 ml foam formed immediately after air blowing and 0 means stability of that foam after 10 minutes settling period is 0 ml.

I think 10 to 20 ml foam is permitted generally.

3/9/061:03 AM

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jessMember

krishnakumar menhon,

thank you so much for you answer.that realy great answer.