calcium content in lithium EP grease

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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

1/1/207:12 AM

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