In drilling fluids (mud), solid content is the sum of all soluble and insoluble materials suspended in the liquid.
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However, "solid content" generally refers to the non-volatile portion of a substance. Depending on what that video was about, here is the technical breakdown of what "solid content" means in common industrial contexts: 1. Materials & Manufacturing (Coatings, Inks, Adhesives) In drilling fluids (mud), solid content is the