Dear all
Which of the following would be a better solution for gear lubrication:
PAO or PAG oils
Also let me know which is more superioe and on what factors?
Original Post
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From https://forums.noria.com/eve/fo...6604995/m/1641002312
"The different between PAG and PAO industial gear oil?
Victory
Level 1 - 1 to 50 posts
Posted Fri August 31 2007 12:26 AM
We know syntheic fluids used in industrial gear oil conclude PAG and PAO (and/or ester). When we test the performance of these two types gear oils, the properties of PAG gear oil is poorer than PAO gear, such as rust prevention (B method for syntheic sea water), demusibility (ASTM D2711). Is PAG gear oil not suitable for used in condition which water exists? And How did we test the demusibility of PAG industrial gear oil? Does the rust prevention of PAG industial gear oil only reach A method for distilled water in ASTM D2711?
Posts: 1 | Registered: Thu August 30 2007
GreaseSpec
Level 3 - 101 to 250 posts
Posted Thu November 01 2007 06:54 PM Hide Post
Chemically PAG as a glycol is an alcohol and it is hydrophilic (combines easily with water). In that regard, it will never demulsify like PAOs (hydrophobic).
Use PAGs only in applications where temperature conditions exceed the area of PAOs, that is 130 to 180 degrees C (240F to 400F)
PAG leave less residues when they evaporate at high temperature. or...don't use PAGs at all. If the problem is heat and water, apply good ester based gear oils that are resistant to heat and demulsify very good. difficult to find though. Use proper seals for Esters, consult your seals or lubricant supplier. let me know if you cannot find them.
Posts: 116 | Location: Atlanta | Registered: Sat March 06 2004"
Here are some excellent industrial synthetic gear lubes:
http://www.amsoil.com/storefro...ries.aspx?zo=1181889 .
http://www.amsoil.com/storefro...ries.aspx?zo=1181889 .
"The different between PAG and PAO industial gear oil?
Victory
Level 1 - 1 to 50 posts
Posted Fri August 31 2007 12:26 AM
We know syntheic fluids used in industrial gear oil conclude PAG and PAO (and/or ester). When we test the performance of these two types gear oils, the properties of PAG gear oil is poorer than PAO gear, such as rust prevention (B method for syntheic sea water), demusibility (ASTM D2711). Is PAG gear oil not suitable for used in condition which water exists? And How did we test the demusibility of PAG industrial gear oil? Does the rust prevention of PAG industial gear oil only reach A method for distilled water in ASTM D2711?
Posts: 1 | Registered: Thu August 30 2007
GreaseSpec
Level 3 - 101 to 250 posts
Posted Thu November 01 2007 06:54 PM Hide Post
Chemically PAG as a glycol is an alcohol and it is hydrophilic (combines easily with water). In that regard, it will never demulsify like PAOs (hydrophobic).
Use PAGs only in applications where temperature conditions exceed the area of PAOs, that is 130 to 180 degrees C (240F to 400F)
PAG leave less residues when they evaporate at high temperature. or...don't use PAGs at all. If the problem is heat and water, apply good ester based gear oils that are resistant to heat and demulsify very good. difficult to find though. Use proper seals for Esters, consult your seals or lubricant supplier. let me know if you cannot find them.
Posts: 116 | Location: Atlanta | Registered: Sat March 06 2004"
Here are some excellent industrial synthetic gear lubes:
http://www.amsoil.com/storefro...ries.aspx?zo=1181889 .
http://www.amsoil.com/storefro...ries.aspx?zo=1181889 .
Wow ok:
PAG: Reaction between Alcohol and epoxide and is a one way reaction and will not revert back to acid and alcohol. PAG's are slight hydroscopic but don't get me wrong it will not take in a large percent of water. We have seen 300 - 4,200ppm water depending one the season. Non-water soluble PAG's can hold up to 7,500ppm water soluble in the fluid with no rust or free standing water. After that saturation ppint you have the potential of free standing water but keep in mind the product is inert to the water. PAG's chemically will not create sludge, gel or insoluble varnish in your system. They have lower coeffiecent of friction and will lower your sump temps over PAO products. PAG's have shown that they will extend the life of your equipment no matter the temperature range. They have a lower wear rate over mineral oil products like PAO's and regular EP products. They also have 100% water soluble PAG's that will leave no sheen on water. Both PAO's and PAG's are good lubricants but some of them will still react like a mineral oil because that is what they really are.
PAG: Reaction between Alcohol and epoxide and is a one way reaction and will not revert back to acid and alcohol. PAG's are slight hydroscopic but don't get me wrong it will not take in a large percent of water. We have seen 300 - 4,200ppm water depending one the season. Non-water soluble PAG's can hold up to 7,500ppm water soluble in the fluid with no rust or free standing water. After that saturation ppint you have the potential of free standing water but keep in mind the product is inert to the water. PAG's chemically will not create sludge, gel or insoluble varnish in your system. They have lower coeffiecent of friction and will lower your sump temps over PAO products. PAG's have shown that they will extend the life of your equipment no matter the temperature range. They have a lower wear rate over mineral oil products like PAO's and regular EP products. They also have 100% water soluble PAG's that will leave no sheen on water. Both PAO's and PAG's are good lubricants but some of them will still react like a mineral oil because that is what they really are.
THANKX LUBE
We think its depend on Manufacturer recommendation other wise PAG is much better.
POA are easy to replace and can be mixed with other mineral oils but PAG are not.
Elba Lubrication have such products that can solve your problem
POA are easy to replace and can be mixed with other mineral oils but PAG are not.
Elba Lubrication have such products that can solve your problem
Does the mixing of the two oils have an effect on the seals?