P.V.A.
P.V.A.
Chemical Formula: (C?H?O)?
Molecular Weight: Variable (typically 44,000 – 186,000 g/mol, depending on grade)
Description:
Polyvinyl Alcohol (P.V.A.) is a white to off-white, odorless, water-soluble synthetic polymer produced by the controlled hydrolysis of polyvinyl acetate. It possesses excellent film-forming, adhesive, emulsifying, and barrier properties. P.V.A. is non-toxic, biodegradable, and widely used across industrial, textile, paper, and construction applications.
Applications:
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Adhesives: Used in wood glues, paper adhesives, and packaging applications due to strong bonding properties.
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Textile Industry: Functions as a sizing agent, warp dressing, and finishing resin to improve fabric strength.
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Paper Coating: Enhances surface gloss, oil resistance, and printability of coated paper.
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Construction: Used in cement admixtures and mortars to improve workability and adhesion.
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Cosmetics & Pharmaceuticals: Acts as a film-former and binder in tablets, masks, and lotions.
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Emulsion Polymerization: Serves as a protective colloid and stabilizer in vinyl acetate and acrylate emulsions
Key Properties:
| Property | Description |
|---|---|
| Appearance | White to off-white granular or powder form |
| Odor | Odorless |
| Purity (Assay) | ≥ 98% |
| Viscosity (4% Solution @20°C) | 4 – 60 cps (varies by grade) |
| Degree of Hydrolysis | 87% – 99% |
| pH (4% Solution) | 5.0 – 7.0 |
| Solubility | Soluble in hot water; insoluble in cold water and most organic solvents |
| Density (@25°C) | ~1.25 g/cm³ |
| Film Properties | Transparent, flexible, strong |
| Moisture Content | ≤ 5% |
| Grade | Industrial / Technical / Fully Hydrolyzed / Partially Hydrolyzed |
| Packaging | 25 kg HDPE bags or paper sacks |
| Storage | Store in a cool, dry, and well-ventilated area away from moisture and heat. Keep bags tightly sealed. Handle with dry equipment. |
