Urethane Prepolymer Tank Selection (HDPE Outside Scope; Stainless ASME Required)

Storing Urethane Prepolymer? Start Here

Urethane prepolymer is a versatile material used in coatings, adhesives, sealants, and elastomers. However, it is highly reactive with moisture, which can cause it to foam, skin, and cure prematurely. Proper storage is crucial to maintain its quality and effectiveness. This means keeping it dry, warm, and under a nitrogen blanket to prevent any contact with humidity.

Can you store it in a poly tank?

No, using a polyethylene tank for storing urethane prepolymer is not recommended. The moisture permeability of polyethylene can lead to in-tank skin formation, foaming, and curing. For long-term storage, use a stainless steel tank with a nitrogen blanket to keep the prepolymer stable and effective.

Key Issue: Moisture Sensitivity

Urethane prepolymer is extremely sensitive to moisture. Even slight exposure to atmospheric humidity can trigger unwanted reactions. It's essential to maintain a dry environment with a continuous nitrogen blanket and avoid any water contact to prevent product degradation.

The safety that actually matters

• Always use a supplied-air respirator when handling.
• Wear chemical-resistant clothing and nitrile gloves.
• Ensure emergency showers and eye wash stations are nearby.
• Keep the storage area dry and free from water lines.
• Maintain a nitrogen blanket with a dew point below -40°C.

Common questions

Can urethane prepolymer be stored at low temperatures?

No, it should be kept between 25-30°C to prevent viscosity changes and crystallization.

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

A stainless steel tank with a nitrogen blanket is ideal for preventing moisture exposure.

What precautions should be taken during handling?

Use a supplied-air respirator, wear protective clothing, and ensure proper ventilation and emergency equipment are available.