At what temperatures the PAO basestock start to crack?
Original Post
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Hi there mate,
You should check wikipedia page http://en.wikipedia.org/wiki/Synthetic_oil
from what I've seen they give you all the information you're looking for.
Also here : http://www.articlesbase.com/au...-choose-1951416.html
Worth a check and if you find the answer maybe you will come back and contribute to this forum by posting proper answer.
You should check wikipedia page http://en.wikipedia.org/wiki/Synthetic_oil
from what I've seen they give you all the information you're looking for.
Also here : http://www.articlesbase.com/au...-choose-1951416.html
Worth a check and if you find the answer maybe you will come back and contribute to this forum by posting proper answer.
What exactly do you mean by "start to crack"?
I guess you mean what the temperature that PAO start to degrade?
I don't have that info but you can get that by DSC test.
I don't have that info but you can get that by DSC test.
Minerals used in heat transfer applications start around 500C if memory serves. I'd expect PAOs to be higher, but I don't know by how much.
John Micetic - Thermal cracking is typically observed in heat transfer fluids in closed systems. They are not exposed to significant amounts of oxygen, so they don't oxidize. But at a certain point, the molecules begin to break into shorter chain lengths. The two common indicators are viscosity and flash point, both which drop when the oil cracks. Operators of these systems typically 'bleed & feed' when they see this.
John Micetic - Thermal cracking is typically observed in heat transfer fluids in closed systems. They are not exposed to significant amounts of oxygen, so they don't oxidize. But at a certain point, the molecules begin to break into shorter chain lengths. The two common indicators are viscosity and flash point, both which drop when the oil cracks. Operators of these systems typically 'bleed & feed' when they see this.
Personally I have seen thermal cracking in open systems at OSB mills where they do not use nitrogen or an inert gas to blanket the expansion tank. Once the oil starts to thermally degrade it is problematic.If help is needed cleaning a system or bleed and feed, please contact me.
Yeah wikipedia is always a good choice to find out information or google howto 
