Selvol PVOH 205 is a partially hydrolyzed, low-viscosity polyvinyl alcohol resin. In industrial chemistry, choosing the exact resin grade—rather than just the generic polymer category—is crucial for formulation stability, process efficiency, and final adhesion performance.
1.Technical Specifications & Primary Characteristics
Selvol PVOH 205 is characterized by its balanced molecular structure and specific physical properties:
| Key Parameter | Specification | Technical Impact |
| Degree of Hydrolysis | 87.0–89.0 mol% (~88 mol% nominal) | Leaves residual acetate groups on the polymer backbone, increasing surface activity, flexibility, and compatibility with hydrophobic substrates. |
| Viscosity (4% Aqueous Solution @ 20°C) | 5.2–6.2 cP | Low molecular weight range ensures low rheological load, high pumpability, and quick dissolution even at higher solids concentrations. |
| Working pH Range | 4.5–6.5 | Yields clear, stable aqueous solutions in standard formulation conditions. |
| Product Variants | Standard Granular & Fine Powder | Fine powder form allows seamless dry-blending in cementitious and gypsum formulations. |
| Regulatory Compliance | Complies with FDA and BfR food contact regulations | Suitable for indirect food contact applications, including paper/packaging adhesives. |
Key Formulation Advantages Over Fully Hydrolyzed Grades
Compared to fully hydrolyzed PVOH grades (98%+ hydrolysis), Selvol PVOH 205 offers critical processing and performance benefits:
Higher Surface Activity & Emulsification: Residual acetyl groups impart amphiphilic properties, making it an excellent protective colloid and emulsifier.
Superior Film Flexibility: Forms a softer, non-brittle dry film with higher elongation and lower stress cracking compared to rigid, fully hydrolyzed films.
Enhanced Substrate Adhesion: Demonstrates strong tack and adhesion to non-polar, synthetic, or cellulosic substrates.
Lower Dissolution Temperatures: Dissolves faster at lower thermal thresholds, reducing energy consumption during industrial batch preparation.
2.Industrial Applications
Wood & Paper Converting Adhesives
Role: Acts as a protective colloid during emulsion polymerization of Polyvinyl Acetate (PVAc).
Problem Solved: Prevents PVAc emulsion phase separation, enhances freeze-thaw stability, extends open time, and boosts green tack.
Key Uses: Multi-ply paperboard lamination, paper tube winding, furniture glues, and edge-banding.
Packaging & Labeling Adhesives
Role: Primary binder and tackifier in high-speed labeling and lamination systems.
Problem Solved: Improves wet tack on glass and plastic, prevents film yellowing/hazing due to high light stability, and ensures clean high-speed machining.
Key Uses: Glass/plastic bottle labeling, pressure-sensitive labels, multiwall paper bags, and flexible film lamination.
Construction Emulsions & Redispersible Powders
Role: Protective colloid in spray-dried Redispersible Polymer Powders (RDP).
Problem Solved: Prevents caking during powder storage and ensures rapid redispersibility upon adding water at the job site, contributing direct tensile strength to mortar matrices.
Key Uses: Tile adhesives, self-leveling underlayments, EIFS systems, and dry-mix mortars (utilizing fine powder Selvol E 205).
Remoistenable Adhesive Systems
Role: Water-reactivable film former.
Problem Solved: Forms non-tacky dry films that quickly and uniformly reactivate when re-wetted, eliminating cold spots or adhesive bonding gaps.
Key Uses: Envelope flap glues, postage stamps, and water-activated gummed packaging tapes for e-commerce logistics.
Specialty Paper & Barrier Coatings
Role: Co-binder and oil/grease barrier agent.
Problem Solved: Its low solution viscosity permits high-speed coater operations without viscosity spikes; creates a dense hydrogen-bonded barrier against grease, oils, and oxygen.
Key Uses: Thermal paper protective topcoats, carbonless paper barrier layers, and grease-resistant food packaging board.
Synthetic Textile Warp Sizing
Role: Protective film-forming size for synthetic and blend yarns.
Problem Solved: Stronger adhesion to hydrophobic polyester/nylon fibers prevents shedding and thread breaks during high-speed weaving; lower crystallinity allows clean hot-water desizing.
Key Uses: Filament yarn sizing, polyester-cotton spun yarn sizing, and wet-laid nonwoven binder applications.
Specialty Binders & Temporary Industrial Coatings
Role: Transient binder and sacrificial film former.
Problem Solved: Provides temporary structural green strength before clean burnout or complete water-rinse removal without residue.
Key Uses: Ceramic green-body binding (alumina/zirconia), peelable protective masking coatings, microencapsulation shells, and unit-dose detergent films.
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