NINGBO INNO PHARMCHEM CO.,LTD. offers a comprehensive portfolio of Polyvinyl Alcohol (PVA) grades, recognizing that selecting the appropriate type is crucial for achieving optimal results in any industrial application. PVA's versatility stems from its molecular structure, which can be tailored through its degree of hydrolysis and viscosity, leading to distinct performance characteristics.

The degree of hydrolysis refers to the percentage of vinyl acetate groups in the polyvinyl acetate precursor that have been converted into hydroxyl groups. This parameter significantly influences PVA's solubility and film properties. Fully hydrolyzed PVA (typically 98-99% hydrolysis) forms stronger, more rigid films and exhibits better chemical resistance. However, it requires higher temperatures for dissolution. Partially hydrolyzed PVA (around 87-88% hydrolysis) is more readily soluble, even in cold or warm water, and produces more flexible films. This makes it suitable for applications where ease of processing and flexibility are key, such as certain adhesives or textile sizing for synthetic fibers.

Viscosity, often indicated by numerical codes (e.g., in PVA 2488, '24' might relate to viscosity), is another critical factor. Higher viscosity grades generally result in thicker solutions and stronger films, making them ideal for applications requiring robust bonding or significant film strength, like industrial adhesives or warp sizing for heavy-duty textiles. Lower viscosity grades produce thinner solutions and are often preferred for applications where flowability and ease of application are paramount, such as in certain coatings or personal care products.

For instance, in textile warp sizing, a high-DP, high-hydrolysis PVA like PVA-1799 is preferred for cotton yarns due to its strength and easy desizing characteristics. In contrast, a partial-hydrolysis PVA with a lower DP might be used for synthetic fibers. Similarly, in paper coating, different PVA grades are chosen based on the desired surface properties and printability. For construction applications, specific viscosity grades are selected to optimize workability and adhesion.

Understanding these distinctions is key to leveraging PVA effectively. NINGBO INNO PHARMCHEM CO.,LTD. provides detailed specifications for each of our PVA products, assisting clients in selecting the ideal grade for their specific needs, whether it's for textiles, paper, adhesives, construction, or other specialized applications. Our expert team is available to guide you in choosing the most suitable PVA for your formulation and achieving superior product performance.