TDI Storage — Toluene Diisocyanate Tank Selection

Storing Toluene Diisocyanate (TDI)? Start Here

Toluene Diisocyanate, or TDI, is a key ingredient in making flexible polyurethane foam, which is used in everything from furniture cushions to automotive seating. It's also used in coatings and elastomers. However, storing TDI requires careful consideration due to its high vapor pressure and strict regulatory controls. Understanding the right storage solutions is crucial for safety and compliance.

Can you store it in a poly tank?

No, polyethylene tanks are not suitable for storing TDI. The material's permeability to moisture and vapor can lead to product degradation and hazardous emissions. Instead, TDI should be stored in 304 or 316 stainless steel tanks or carbon steel tanks with an epoxy-phenolic lining.

Vapor and Moisture Concerns

Due to TDI's high vapor pressure, it can easily permeate through unsuitable materials, leading to workplace safety issues. Additionally, moisture can react with TDI, causing pressure buildup and product degradation. Proper storage solutions must address both vapor containment and moisture exclusion.

The safety that actually matters

• Use stainless steel or lined carbon steel tanks to prevent leaks and emissions.
• Ensure tanks are equipped with a nitrogen blanket to minimize exposure to air.
• Implement engineered vapor-recovery systems to control emissions.

Common questions

Why can't polyethylene tanks be used for TDI?

Polyethylene allows moisture and vapor to pass through, which can degrade TDI and create safety hazards.

What materials are recommended for TDI storage?

304 or 316 stainless steel and epoxy-phenolic-lined carbon steel are industry standards.

How should TDI tanks be maintained?

Regularly check seals and gaskets, and recoat lined tanks every 7-10 years.