Polyurethane Prepolymer Storage — NCO-Terminated MDI / TDI Tank Selection

Storing Polyurethane Prepolymer? Start Here

Polyurethane prepolymers are essential for creating coatings, adhesives, sealants, and elastomers. They are sensitive to moisture, heat, and certain chemicals, which can trigger unwanted reactions. If you're handling these materials, it's crucial to know how to store them safely to prevent any hazardous incidents.

Can you store it in a poly tank?

Storing polyurethane prepolymers in poly tanks is possible but comes with conditions. Short-term storage in HDPE or XLPE tanks is acceptable, but you must use a nitrogen blanket to prevent moisture permeation. For long-term or high-purity needs, PVDF or PTFE tanks are preferred. Stainless steel or epoxy-phenolic-coated carbon steel tanks are standard for industrial use.

Watch Out for Moisture

Moisture is a major concern when storing polyurethane prepolymers. It reacts with the isocyanate groups, leading to gas formation and potential container damage. Always ensure your storage setup includes a nitrogen blanket to keep moisture at bay.

The safety that actually matters

• Use a nitrogen blanket to prevent moisture ingress.
• Ensure proper ventilation with carbon canisters and scrubbers.
• Handle with care to prevent exposure to isocyanates, which can cause severe respiratory issues.

Common questions

What type of tank is best for long-term storage?

For long-term storage, PVDF or PTFE tanks are ideal due to their resistance to moisture and chemical reactions.

Why is a nitrogen blanket necessary?

A nitrogen blanket prevents moisture from entering the tank, which could react with the prepolymer and cause damage.

What should I do if I suspect a leak?

Immediately evacuate the area, ensure proper ventilation, and contact a professional to assess and repair the leak.