| Paste (rheology) |
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In Physics , a paste is a substance that behaves as a Solid until a sufficiently large load or Stress is applied, at which point it flows like a Fluid . In Rheoological terms a paste is an example of a Bingham Plastic Fluid . Pastes typically consist of a Suspension of small particles in a background fluid. The small particles are jammed together like grains of Sand on a Beach , forming a disordered, Glass y or Amorphous structure, and giving pastes their solid-like character. It is this "jamming together" that gives pastes some of their most unusual properties. In pharmacology, paste is basic Pharmaceutical Form . It consists of fatty base (e.g. Petroleum Jelly ) and at least 25% solid substance (e.g. Zinc Oxide ). A thick Glue is often referred to as "paste". Examples include Starch pastes, Toothpaste , Mustard , and Putty . See also Fragile Matter , Granular Material . |
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