Overview
Hydroxypropyl Methylcellulose (HPMC) is a cellulose ether derived from natural cellulose through chemical modification. It is synthesized by introducing hydroxypropyl and methyl groups into the cellulose backbone, enhancing its solubility and functionality. HPMC is valued for its non-toxic, biodegradable, and biocompatible properties, making it suitable for diverse industries. As a multifunctional additive, HPMC serves as a thickener, emulsifier, and stabilizer. Its ability to form transparent gels and films extends its use to pharmaceuticals (e.g., tablet coatings), construction (e.g., cement additives), and food (e.g., vegan substitutes). The compound's performance varies by its degree of substitution (DS) and viscosity grade.
Physical and Chemical Properties
HPMC is a white, odorless powder with high thermal stability. It dissolves in cold water but forms thermally reversible gels when heated, a property exploited in controlled-release drug formulations. The viscosity of HPMC solutions ranges from 5 to 200,000 mPa·s, depending on the molecular weight and concentration. Its chemical inertness ensures compatibility with most excipients and additives. HPMC is stable across a wide pH range (2–12) and exhibits excellent water retention, crucial for construction applications like tile adhesives and renders. The polymer is non-ionic, reducing interactions with other charged molecules.
Main Applications
In pharmaceuticals, HPMC is a key excipient for tablet coatings, ophthalmic solutions, and extended-release matrices due to its film-forming and gelation properties. It ensures controlled drug dissolution and masks unpleasant tastes. Construction industries use HPMC as a water-retaining agent in dry-mix mortars, improving workability and adhesion. In food, it acts as a thickener in sauces and a stabilizer in dairy alternatives. Cosmetic formulations leverage its emulsifying properties in creams and lotions. Each application requires specific HPMC grades, tailored for viscosity and solubility.
Safety and Storage
HPMC is classified as non-hazardous and is approved by the FDA and EFSA for food and pharmaceutical use. Inhalation of dust may cause respiratory irritation, necessitating proper ventilation during handling. Storage recommendations include keeping the powder in tightly sealed containers away from moisture and heat. Bulk quantities should be stored on pallets in a dry warehouse. Shelf life typically exceeds two years if stored correctly. Spills should be swept up promptly to prevent slipping hazards.
B2B Procurement Guide
Procuring HPMC requires clarity on technical specifications: viscosity (e.g., E5, E15), methoxy/hydroxypropyl content, and particle size. Construction-grade HPMC prioritizes water retention, while pharmaceutical grades demand higher purity (USP/EP compliance). Suppliers often provide samples for viscosity testing. Bulk buyers should negotiate pricing based on volume, with prices ranging from $5–$15/kg. Certificates of Analysis (CoA) and regulatory documentation (e.g., REACH, FDA) are essential for quality assurance. Lead times vary by region, with Chinese manufacturers dominating the global supply chain.
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