PVA 088-05S

Polyvinyl alcohol (PVA) is an essential polymer material in numerous applications, including dry-mix mortar, adhesives, and textile sizing. When selecting PVA products, users often focus on their degree of polymerization, alcoholysis degree, and mesh size to ensure core properties such as solubility, viscosity, and bond strength. However, dust content is a crucial, often overlooked indicator that directly impacts production safety, operator health, and material loss. The mesh size of PVA (e.g., 20, 120, 200 mesh) determines its particle size, and particle size is the primary factor determining dust content.    1.Why does PVA generate dust? The dust content of PVA powder is primarily affected by its particle fineness (mesh size) and morphology: Finer particles generate higher dust content. Products with larger mesh sizes (e.g., 200 mesh) have a higher proportion of fine particles and a greater ability to remain suspended in air, resulting in greater dust generation. Static electricity: Dry PVA powder is prone to static electricity during friction and conveying, which can exacerbate the suspension and dispersion of fine particles.   2. Definition and Significance of Dust Content "Dust content" refers to the degree of fine dust suspended in the air during the handling of powder products due to their extremely fine particles. These fine particles (typically less than 10 μm or even 5 μm) not only cause material loss but, more importantly, impact operational safety, environmental cleanliness, and worker health. Dust analysis of PVA products with different mesh sizes: Mesh Size 20 mesh (PVA 088-05) 120 mesh (PVA 088-50S) 200 mesh (PVA-217S) Particle Size Range Approximately 800-900 μm Approximately 100-150 μm Approximately 50-80 μm Particle Surface Area Very Low Moderate Moderate Very High Dust Level (Relative) Low Medium-Low High Photo Aerodynamic Characteristics Heavy particles with high inertia settle easily and are difficult to suspend. 120 mesh (CCP BP-24S) settle quickly, but will still fly at the moment of feeding. Light particles are easily carried by air currents and remain suspended for a long time, forming a dust cloud. Occupational Health Risks Lowest risk. Dust is mostly non-inhalable and has minimal respiratory irritation. Risk is manageable. General local exhaust ventilation and protective equipment are required. Highest risk. Fine dust poses a high risk of lung entry and requires strict protection. Dust Explosion Risk Large particle size makes dust cloud formation difficult, resulting in a low risk. Possesses some potential for dust cloud formation, resulting in a medium risk. Dust cloud density easily reaches the lower explosion limit, resulting in the highest risk. Production and feeding requirements General ventilation is sufficient. Local exhaust or dust hoods are required. Efficient, enclosed feeding and specialized dust collection systems are essential. Cost Factors No additional dust suppression treatment is required. Anti-caking agents (or granulation) may be required to reduce dust. High costs must be invested in crushing, fine grading, and safety protection systems. Properly controlling PVA dust levels is not only a safety requirement but also directly impacts production efficiency and product quality: Excessive dust concentrations can cause material loss and metering errors; Suspended particles entering the reaction system can lead to unstable emulsion polymerization or uneven film thickness; Dust deposition can accelerate equipment wear and affect long-term operational reliability.   Regardless of mesh size, all PVA powder handling practices should adhere to the following basic principles: Avoid vigorous handling: Pour the material into the container slowly and steadily, avoiding pouring from a height to minimize interparticle friction and air turbulence. This is the simplest and most effective way to reduce dust generation. Maintain ventilation in the work area: Local exhaust or exhaust systems must be installed near all feed ports and mixing equipment to capture generated dust at the source. Adhere to chemical management practices: Although PVA has low toxicity, the storage, handling, and emergency response instructions in the Material Safety Data Sheet (SDS) should still be reviewed and followed. Environmental cleanliness: Regularly clean accumulated dust from equipment and floors with an industrial vacuum cleaner. Never use compressed air to blow dust, as this will re-inflate accumulated dust, increasing the risk of explosion and inhalation.   3. Conclusion In the production and use of PVA powder, dust management is the intersection of process control and safety assurance. Different mesh sizes require appropriate feeding methods and protective measures. Especially for fine powders above 120 mesh (CCP BP-20S), engineering approaches to dust control should be prioritized, rather than relying solely on personal protection. Through scientific particle size selection, process design, and environmental control, PVA product performance and production stability can be maximized while ensuring safety.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com  

Polyvinyl alcohol (PVA), an indispensable water-soluble polymer material, is used in a wide range of fields, including construction, textiles, papermaking, and chemicals. Among the many PVA specifications, mesh size, or particle fineness, is a key factor in determining processing efficiency and final product quality.   1. Mesh Size Basics: A Measurement of Particle Size Mesh size is a unit of measurement for powder particle fineness. It refers to the number of holes in a sieve per inch. The smaller the mesh size, the larger (coarser) the particles. Mesh size and dissolution rate: The dissolution process of a powder begins with the wetting and penetration of the particle surface by water molecules. The finer the particle size (the larger the mesh size), the greater its specific surface area. A larger specific surface area means that water molecules can contact more PVA molecular chains, significantly accelerating wetting, swelling, and disentanglement, ultimately increasing dissolution rate. Mesh size and dispersion uniformity: Fine particles are more easily dispersed in liquid or solid mixtures. When coarse particles (such as 20 mesh) are added to water, they are more likely to settle or clump due to density differences, forming "fish eyes" that are difficult to dissolve. Mesh Size and Dust Density: The finer the particle size, the lower the critical velocity at which it becomes suspended in air, resulting in higher dust levels. 20 mesh PVA produces low dust, while 200 mesh PVA requires strict dust control measures.   2. Introduction and Application of PVA Specifications of Different Mesh Sizes Mesh Size  20 mesh(Polyvinyl Alcohol 0588) 120 mesh (PVA 088-05S) 200 mesh (POVAL 22-88 S2) Photo Bulk Density Relatively high Medium Relatively low (fluffy powder) Key Features The largest particles have the lowest surface area. This dissolution process is the slowest, but dust generation during operation is minimal; it is also known as a "low-dust" or "dust-free" grade. This medium-sized particle size is the most commonly used grade in industry. It strikes a good balance between dissolution efficiency, ease of operation, and cost. The extremely fine particles and maximum surface area ensure the fastest dissolution and the best dispersibility. Applications Dry-mix mortar for construction: Coarse-grained PVA, as a binder, is less likely to form high-viscosity clumps during initial mixing, allowing for better dispersion in other components (such as cement and sand). It also produces minimal dust, improving the on-site construction environment.   Specialized slow-release adhesives: In certain specialized construction mortars or adhesives, PVA needs to dissolve slowly to provide lasting adhesion.   Preventing rapid thickening: Suitable for formulations that require prolonged mixing and where rapid thickening of the solution is undesirable. Conventional adhesives: Used in the manufacture of common water-based adhesives such as wood glue and paper glue.   Textile sizing agents: Prepare sizings at standard temperatures and times to meet the sizing requirements of most textiles.   Emulsion polymerization protective colloids: Serves as stabilizers and protective colloids in the polymerization of emulsions (such as VAE and acrylic emulsions). They provide a sufficiently rapid dissolution rate without excessively increasing system viscosity, ensuring stability and particle size distribution during emulsion polymerization. High-end water-based coatings: Suitable for high-end paints and putty powders that require extremely high dispersibility and a minimum of residual particles.   Fast Preparation/Low-Temperature Dissolution: Fine powder ensures rapid and thorough dissolution of PVA at low temperatures or under limited stirring capacity.   Water-Soluble Film: Used in the production of water-soluble packaging films requiring high transparency and good solubility, such as laundry bags and pesticide packaging.   Pharmaceutical/Cosmetic Excipients: Used in certain fine chemical applications requiring high precision.   3. How to Make the Best Choice? Choosing the right mesh size for PVA is essentially a trade-off between production efficiency, environmental safety, and product performance: For those seeking dissolution speed and product fineness (e.g., coatings and films): 200 mesh is preferred. For those seeking versatility, balanced performance, and moderate cost (e.g., conventional adhesives): 120 mesh is preferred(PVA 088-50S). For those emphasizing operational safety, low dust generation (e.g., large-volume batching), or specific sustained-release requirements: 20 mesh is preferred(Poval 217).   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com