Polyvinyl alcohol / PVA

Highly-Resistant | Stable Performace

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Chemical Admixture

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Description

The finished PVA product is solid in form, available in white flakes, granules, powder (produced via low-alkali alcoholysis process), or flocculent form (produced via high-alkali alcoholysis process). Its aqueous solution exhibits excellent film-forming and adhesive properties.

Application

Medicated film; external pharmaceutical substrates; water-soluble film; high-count, high-density sized fabrics; lithographic photosensitive film; papermaking; emulsion; oil well cement concrete modifier; soil conditioner; remoistenable adhesive; warp sizing agent; PVA film; PVAC emulsion protective colloid; photosensitive resin; PVB, etc.

Physical Properties

Item	Parameter
Flake-type PVA Packing Density	0.42–0.51 g/cm³
Filling Specific Gravity of Flocculent PVA	0.20–0.27 g/cm³
Appearance	White solid

Chemical Properties

Item	Description
Water-soluble	It is highly soluble in water, and its solubility increases with rising water temperature. While it only swells in cold water, it can dissolve completely in hot water.
Thermal Stability	It softens when heated, with no significant changes below 40°C. Prolonged heating above 160°C causes gradual coloration, while decomposition occurs above 220°C, producing water, acetic acid, acetaldehyde, and crotonaldehyde.
Chemical Resistance	Highly resistant to weak acids, weak bases, and organic solvents; particularly excellent oil resistance.
Storage Stability	It exhibits excellent stability, remaining mold-free, non-deteriorating, and non-hygroscopic under prolonged storage in natural dry conditions.