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Hydroxypropyl methylcellulose (HPMC), is a semisynthetic, inert, viscoelastic polymer used as eye drops, as well as an excipient and controlled-delivery component in oral medicaments, found in a variety of commercial products.
H 1693 (OTTO) HPMC, K300M Cas 9004-65-3 - used as thickener for aqueous and non-aqueous systems.