PVAc Emulsion Storage — Polyvinyl Acetate White-Glue + Yellow-Glue Tank Selection

Storing Polyvinyl Acetate Emulsion? Start Here

Polyvinyl acetate (PVAc) emulsion is widely used in industries like woodworking, paper converting, and bookbinding. Known for its adhesive properties, it comes in two main types: Type I, the traditional "white glue," and Type II, the "yellow glue" with added moisture resistance. If you're storing this milky adhesive, you'll need to consider the right tank to keep it stable and effective.

Can you store it in a poly tank?

Yes, you can store PVAc emulsion in polyethylene tanks. High-density polyethylene (HDPE) and cross-linked polyethylene (XLPE) are both suitable for this purpose. These materials are standard for storage tanks due to their compatibility and ability to prevent UV degradation of any biocides present in the emulsion.

Key Storage Issue: Emulsion Stability

One of the main concerns with storing PVAc emulsion is maintaining stability and preventing skinning at the air-liquid interface. To address this, ensure your tank has proper venting to allow for nitrogen-blanket replacement, which helps prevent evaporation and concentration changes in the emulsion.

The safety that actually matters

• Use opaque tanks to prevent UV degradation of the emulsion.
• Ensure proper venting to maintain emulsion stability.
• Match gaskets and fittings to the manufacturer's compatibility chart.

Common questions

Can I use a stainless steel tank for PVAc emulsion?

Yes, 316L stainless steel tanks are suitable, especially for food-contact applications.

What type of gaskets should I use?

EPDM gaskets are standard for production-line use with PVAc emulsion.

How do I prevent microbial growth in the emulsion?

Ensure the biocide levels are maintained and store the emulsion in a cool, dark place.