Hydroxypropyl methylcellulose (HPMC) is a semisynthetic, viscoelastic polymer, it is a cellulose ether.Hydroxypropylmethyl cellulose (HPMC) can be dissolved into some organic solvents and also in water-organic solvent mixed solvents. it does not have a gelation property when heated. HPMC is a is non-toxic to humans the raw material from cotton and wood.
Hydroxypropyl methylcellulose (HPMC) is hygroscopic after drying but stable. Its solution is stable at PH 4-8 (in 1% solution 25℃). As the temperature increases, the viscosity of the solution decreases. Heating-cooling can reversibly convert HPMC from a solution state to a gel state. According to different grades and concentrations, the gelation temperature is 50 ～ 90 ℃. HPMC aqueous solution has anti-enzyme effect and maintains good viscosity stability during long-term storage. However, its aqueous solution is susceptible to attack by microorganisms, so preservatives should be added during storage. When HPMC is used as a thickener in ophthalmic eye drops, benzalkonium chloride is usually added as a preservative.
Chemical and Physical Specifications:
Gelling temperature (℃)
Viscosity 2% Solution
1. Pharmaceutical Grade(USP42)
2. Construction Grade HPMC
3. HPMC for Liquid Detergent
Packed in 25KG fiber drums
Packed in 20KG/25KG bags
Each packing unit must carry a label indicating the name of "Hydroxypropyl methylcellulose (HPMC)", the net weight, the name of the manufacture, the date of production, the batch code, expiry date or shelf life and storage condition.
Keep in a cool, well-ventilated place, stored away from extreme heat and away from strong oxidizing agents.
In addition to the quality criteria mentioned above, the material must be conforming to all other requirements of the Chinese Food Regulation that not specifically quoted in this specification.