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calcium content in lithium EP grease #5309872 01/01/20 09:11 AM
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majid Offline OP
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Hi
I find about 1400 ppm Calcium in Lithium EP grease. Why producers add Calcium to this kind of grease. This is not LI-Ca grease and it is only Lithium EP grease. What is the function of calcium in Lithium Grease? What is the source of Calcium? Is it additive like TBN booster or another form of Calcium component?

Thank you

Re: calcium content in lithium EP grease [Re: majid] #5310013 01/01/20 11:22 AM
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Re: calcium content in lithium EP grease [Re: majid] #5311501 01/02/20 07:58 PM
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RDMgr Offline
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Some EP greases, including some lithium or lithium complex greases, may contain calcium in the form of calcium carbonate for EP. Another potential source is a neutral or overbased calcium sulfonate rust inhibitor. An overbased calcium sulfonate may be used as a rust inhibitor and an EP additive. 5.6% of a 2.5% OB calcium sulfonate would yield 1400 ppm of calcium, great rust protection, moderate EP and possibly improved water resistance.

Re: calcium content in lithium EP grease [Re: majid] #5311755 01/03/20 12:57 AM
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majid Offline OP
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Thank you RDMgr.
Where is the source of OB calcium sulfonate? Is it from calcium sulfonate TNB booster as an additive or calcium sulfonate complex grease which is added to lithium grease?

Re: calcium content in lithium EP grease [Re: MolaKule] #5311756 01/03/20 12:58 AM
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Thank you

Re: calcium content in lithium EP grease [Re: majid] #5312246 01/03/20 01:48 PM
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RDMgr Offline
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A neutral calcium sulfonate would be for rust prevention. An OB calcium sulfonate would be for rust prevention and possibly an EP boost. The excess of calcite might be enough to boost EP. In a grease it isn't likely for the TBN benefit. Acidification is not usually a problem in multipurpose greases.

Re: calcium content in lithium EP grease [Re: RDMgr] #5319283 01/11/20 03:41 AM
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majid Offline OP
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Dear RDMgr
Many thank for your useful information..

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