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General properties common to the whole family of METHOCEL cellulose ether products are listed below. Individual METHOCEL products exhibit these properties to varying degrees and may have additional properties that are desirable for specific applications.
Water solubility - METHOCEL cellulose ethers dissolve in water with no sharp solubility limit. Surface-treated and granular METHOCEL products can be added directly to aqueous systems. This feature provides exceptional handling flexibility and control of solubilization rate. Although untreated METHOCEL powders are soluble in cold water, they must first be thoroughly dispersed in the water to prevent lumping. The maximum concentration is limited only by solution viscosity.
Organic solubility - Certain types and grades of METHOCEL cellulose ethers are also soluble in binary organic and organic solvent/water systems, providing a unique combination of organic solubility and water solubility.
No ionic charge - METHOCEL cellulose ethers are nonionic and will not complex with metallic salts or other ionic species to form insoluble precipitates.
Thermal gelation - Aqueous solutions of METHOCEL products gel when heated above a particular temperature, providing controllable quick-set properties. Unlike gels formed by protein thickeners, the gels go back into solution upon cooling.
Surface activity - METHOCEL cellulose ether products act as surfactants in aqueous solutions to provide emulsification, protective colloid action, and phase stabilization. Surface tensions range from 42 to 64 mN/m. The surface tension of water is 72 mN/m; a typical surfactant has a surface tension of 30 mN/m.
Metabolic inertness - Used as food and drug additives, METHOCEL products do not add calories to the diet.
Enzyme resistance - Enzyme-resistant METHOCEL products provide excellent viscosity stability during long-term storage.
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Low taste and odor - METHOCEL cellulose ethers have excellent (low) flavor and aroma properties, which is important in food and pharmaceutical applications.
pH stability - METHOCEL cellulose ethers are stable over a pH range of 3 to 11.
Water retention - METHOCEL cellulose ethers are highly efficient water-retention agents. This is valuable in food products, ceramics, coatings on adsorbent construction substrates, and many other applications.
Thickening - METHOCEL cellulose ethers thicken both aqueous and nonaqueous systems. The viscosity is related to the molecular weight, chemical type, and concentration of the specific METHOCEL product.
Film formation - METHOCEL products form clear, tough, flexible films that are excellent barriers to oils and greases. In food applications, this property is often used to retain moisture and prevent oil absorption during cooking.
Binding - METHOCEL cellulose ethers are used as high-performance binders for pigments, paper, structured foods, pharmaceutical products, and ceramics.
Lubrication - METHOCEL products are used to reduce friction in rubber, cement, and ceramic extrusions. They are also used to improve pumpability of concrete and spray plasters, such as stucco, and in food applications as lubricity aids in extrusion and other forming processes.
Suspending - METHOCEL products are used to control settling of solid particles, for example, herbs and spices in salad dressings, solids in ceramic slips, and antacid suspensions.
Protective colloidal action - METHOCEL products are used to prevent droplets and particles from coalescing or agglomerating.
Emulsification - METHOCEL cellulose ethers stabilize emulsions by reducing surface and interfacial tensions and by thickening the aqueous phase.
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