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High water solubility with rapid dissolution in cold and warm water.
Excellent film-forming capability yielding transparent, flexible, and strong films.
Superior adhesion to polar substrates including paper, cellulose, metals, and ceramics.
Good compatibility with starch, acrylics, casein, and other water-soluble polymers.
Low residual acetaldehyde content, ensuring high purity and suitability for sensitive applications.
Water-soluble packaging films for detergent pods and agrochemical encapsulation.
Binders for ceramic and metallurgical green bodies in additive manufacturing and powder metallurgy.
Reinforcing agent and sizing agent for high-performance textile yarns (e.g., carbon fiber tow).
Emulsion stabilizer and protective colloid in vinyl acetate and acrylic polymerizations.
Thickener and film former in water-based coatings and inkjet-receptive coating layers.
| Chemical Type | Polyvinyl alcohol (fully hydrolyzed) |
| Product Form | White granular powder |
| Appearance | Free-flowing white granules |
| Saponification Degree | ≥ 98.0 mol% |
| Viscosity (4% aqueous solution, 20°C) | 4.7–5.3 mPa·s |
| Volatiles (105°C, 2 hrs) | ≤ 5.0 wt% |
| pH (1% aqueous solution) | 5.5–6.5 |
| Residual Acetate Content | ≤ 1.5 mol% |
Q1: What is the typical degree of hydrolysis and molecular weight range for POVAL PVA 505?
A: POVAL PVA 505 is a partially hydrolyzed polyvinyl alcohol grade with medium hydrophilicity and balanced solubility. It features a moderate degree of hydrolysis—higher than fully hydrophobic grades but lower than fully hydrolyzed types—enabling good water solubility while retaining film-forming integrity and adhesion in aqueous systems.
Q2: How does POVAL PVA 505 perform in water-based adhesive formulations?
A: POVAL PVA 505 is widely used as a binder and rheology modifier in water-based adhesives, especially for paper, cardboard, and textile applications. Its balanced hydrolysis supports strong wet tack, cohesive strength, and rapid film formation upon drying, without excessive brittleness or delayed setting.
Q3: Is POVAL PVA 505 suitable for use in pharmaceutical or food-contact applications?
A: POVAL PVA 505 is manufactured under stringent quality control and complies with general industrial-grade purity requirements. While it is not pre-certified for direct pharmaceutical or food-contact use, it may be evaluated for such purposes depending on final formulation, processing conditions, and regulatory review by the end-user’s compliance team.
Q4: What are the recommended dissolution conditions for POVAL PVA 505?
A: For optimal dissolution, disperse POVAL PVA 505 gradually into cold water with vigorous agitation to avoid lumping, then heat the slurry to 80–90 °C while maintaining stirring until fully dissolved. Avoid adding powder directly to hot water, as surface gelation may hinder complete hydration.
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