RRMsand
RRMsand is a term that appears to be a misspelling or a very niche, unestablished concept. It does not correspond to any widely recognized scientific, technological, or cultural term.
If "RRMsand" is intended to refer to a specific material, it's possible it is a proprietary name,
Without additional information or clarification on the intended meaning of "RRMsand," it is impossible to provide