Tablet/micro-pellet Sustained-release Coating, Matrix Material, Moisture-proof And Oxygen-barrier EC Pharmaceutical-grade ethyl cellulose (EC) is a classic hydrophobic pharmaceutical excipient for oral solid dosage forms. It is water-insoluble but soluble in organic solvents, forming a strong and dense film. It can be used for sustained-release coating of tablets, microcapsules, and granules, and can also be used as a sustained-release matrix material for direct tablet