Hydroxypropyl Methyl Cellulose Industrial Grade/HPMC

1.  Appearance: HPMC is a nonionic cellulose ether, white grayish-white powder or granule,odorless and flavorless, soluble in cold water, glacial acetic acid, ethanol, methanol and propylene glycol, slightly soluble in acetone depending on the degree of substitutions, practically insoluble in hot water, ethylene glycol and toluene. HPMC is dissolved in a mixture of 10% methanol and 90% methylene chloride to form colloidal solutions.

2.  The solution of HPMC has surface activity, high transparency, and stable performance. When heated at certain temperature, the solution becomes cloudy or forms flocculent gel. However, the solution becomes clear again after cooling. Different types of HPMC have different gelation temperatures. The solubility varies with the viscosity. The lower the viscosity, the higher solubility it has. The different types of HPMC are different in some properties and their solubility in water is not affected by pH.

 

Type  Index	HT-E	HT-F	HT-K
Methoxy %	28.0-30.0	27.0-30.0	19.0-24.0
Hydroxy propyl %	7.0-12.0	4.0-7.5	4.0-12.0
Gelatification temperature/°C	58-64	62-68	70-90
Loss on drying	≤5%
pH	4.0-8.0 (1%Solution,25°C)
Residue on Ignition	≤1.0 %
Heavy metals	≤ 20 ppm
Lead	≤ 10 ppm