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.

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.

krishnakumar menhon,

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