Selvol PVOH Solution Preparation

Most industrial applications require you to dissolve Selvol polyvinyl alcohol (PVOH/PVA) in water before use. 

S-grades may allow for coldwater processing under specific conditions. You must cook all non S-grade Selvol products to achieve a functional solution.

Below is a guide providing clear steps to prepare Selvol PVOH solutions, manage solids content and avoid common processing issues. 

See Selvol PVOH technical data sheets (TDS) and safety data sheets (SDS).

Successful solution preparation follows a two-part process: dispersion, then dissolution.

• Disperse first. Always add Selvol PVOH to cold or room-temperature water.
• Agitate vigorously. Maintain enough agitation to wet out every particle before you apply heat. As a general rule, ensure the water surface moves vigorously during powder addition.
• Cook out the solution. Heat most grades to a range between 185°F and 205°F (85–96°C), and hold that temperature for 30 minutes.
• Maintain stability. Note that Selvol PVOH remains in solution once cooked. You can then use it at any temperature your process requires.

Follow these steps to achieve a consistent, high-quality solution with Selvol PVOH:

• Prepare the water. Fill your tank with clean, cold or room-temperature water.

• Start the agitator. Confirm that the water surface moves vigorously across the tank.

• Add the powder. Introduce Selvol PVOH steadily at the recommended rate for your grade.

• Complete the wet-out. Continue mixing until you fully disperse and wet all particles.

• Apply heat. Raise the temperature to the recommended cook-out level for the grade.

• Hold temperature. Maintain the target temperature for at least 30 minutes.

• Cool for use. Cool the solution to your target temperature while maintaining gentle mixing.

This table summarizes typical requirements for common Selvol PVOH grades. Use these values to plan your setup, then verify final details in the current TDS for each grade.

Do not exceed the maximum recommended solids listed for each grade.

Follow these best practices to avoid common quality issues during solution preparation:

• Eliminate borax. Keep all tanks and lines free of borax. Even trace amounts can cause the solution to coagulate instantly.
• Optimize tank design. Use tanks with baffles and flush-bottom valves. This setup prevents dead spots where undissolved PVOH can settle and agglomerate.
• Reach minimum temperature. Hit the minimum cook-out temperature to dissolve the PVOH. Failing to reach this threshold leaves undissolved polymer, regardless of agitation time.
• Manage foaming. Note you cannot overcook Selvol PVOH, but a rolling boil will induce unwanted foam.
• Select proper mixers. Avoid small-diameter, high-speed mixers. These agitators fail to provide adequate bulk mixing and tend to trap air.
• Add defoamers correctly. If you require a defoamer, add it to the water before you add the PVOH. Selvol PVOH grades 805, 823 and 840 generally do not require defoamers.
• Protect stored solutions. If you store solutions for more than 24 hours, add a suitable biocide to maintain stability.

You can also jet-cook Selvol PVOH under controlled conditions. Unlike starch, which undergoes rapid expansion in a steam jet, Selvol PVOH dissolves by gradually shedding layers. Here’s how to support complete solubility in a jet-cooking system:

• Maximize residence time within the jet.
• Provide a holding tank after the jet, and hold the solution for at least 15 minutes.

Selvol PVOH solution conditions often depend on the application and grade:

• Films and coatings may use lower-solids solutions and lower-viscosity grades for smoothness and easy application.
• Adhesives often require higher-solids solutions and medium-viscosity grades for cohesive strength and wet tack.
• Textile sizing solutions demand precise control of solids, viscosity and temperature to support weaving performance.

For more detail on where manufacturers use each grade, see Selvol PVOH Applications and End Uses. To compare Selvol grades by viscosity and hydrolysis level, see Selvol PVOH Product Line and Properties.

Use these steps to refine your Selvol PVOH preparation process:

• Define goals. Identify required solids and viscosity ranges based on your application.
• Verify specifications. Consult the official Selvol PVOH TDS for a grade’s latest specifications.
• Confirm grade fit. Review Selvol product line data to ensure the grade meets your application’s hydrolysis and viscosity needs.
• Perform lab tests. Run a small-scale lab preparation to confirm dissolution and stability before moving to full production.

Use these resources alongside this preparation guide to better understand Selvol PVOH’s possibilities:

• Selvol PVOH — A Versatile, High-Performance Polymer
• Selvol PVOH Solution Preparation Guidelines PDF
• Selvol PVOH Bulk Handling Guidelines
• Selvol PVOH Product Line and Properties
• Selvol PVOH Additives for Formulations

Visit the SEKISUI Resources Library for Selvol PVOH brochures, TDS and SDS.

Selvol solution preparation depends on grade choice, equipment and application. Our team will help you fine-tune conditions.

Reach the SEKISUI Technical Service Team for support with Selvol PVOH solution preparation, troubleshooting and process optimization.