1)The water retention of Methyl Cellulose depends on the dosage, viscosity, particle size, and dissolution rate. Generally, higher dosage, smaller particle size, and higher viscosity result in better water retention. Among various cellulose ethers, Methyl Cellulose and Hydroxypropyl Methylcellulose exhibit higher water retention.
Dispersion: the dispersion of HPMC is better than HEC. But HEC has a stronger protective colloid than HPMC.