Multipurpose synthetic grease with PTFE. See Picture of can: " A Multipurpose grease with Syncolon (PTFE)".(nl)Also says on label: " A heavy duty synthetic grease compatible with other lubricants" and(nl)"Will not harm fabric, rubber, leather, plastic, wood, or paint"(nl)I looked for that in particular since I was concerned about effects on rubber and plastics. So evidence says it works well with Raritan; disastrous with Groco piston ring material (possibly silicone rubber?) almost immediately (few days) on two separate heads. So I would say that users of other heads would just be taking their chances using it unless they have some other evidence.