Cellulose ethers — including methylcellulose, ethylcellulose, hydroxypropyl methylcellulose (HPMC), and carboxymethylcellulose (CMC) — are chemically modified cellulose derivatives traded in primary forms such as powders, granules, and flakes. Their water-retention, thickening, and film-forming properties make them critical inputs for construction chemicals, pharmaceutical tablet coatings, food additives, and personal care formulations. Classification hinges on the specific ether type and degree of substitution, which can affect both the applicable HTS subheading and end-use regulatory requirements. Importers should verify whether the specific grade triggers FDA review for food or drug contact applications.

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