2. Stability of the viscosity

If the aqueous solution of completely hydrolyzed PVA is left in low temperature, the higher concentration, and the lower temperature, the more the solution would be apt to increase its viscosity and form a gel. The lower degree of hydrolysis, the lower concentration, and the higher temperature that the solution stocked, will ease the increasing degree of viscosity.

3. The viscosity of aqueous solution

The viscosity of PVA aqueous solution differs from grades, the concentration, and the temperature.

4. Surface active properties

PVA has a surface active and a protective colloid property. Concerning the surface tension of PVA aqueous solution, the strength of partially hydrolyzed grades, which have more hydrophobic acetic acid groups, is higher than that of completely hydrolyzed grades.

5. Adhesive property

PVA aqueous solution shows extremely high adhesive property against many materials such as paper, fiber, wood, and other cellulose materials.

6. The compatibility with other water-soluble high polymers

(Comparatively) well compatibility:
CMC (carboxymethyl cellulose), acrylic acid ester, glue, casein, sodium alginate, and so on.

Bad compatibility:
Methylcellulose, hydroxy-ethylcellulose, and so on.