Polycaprolactone (PCL) Pellet Storage Tank Selection

Storing Polycaprolactone? Start Here

If you're dealing with polycaprolactone (PCL), you're likely in industries like hot-melt adhesives, medical devices, or polyurethane manufacturing. PCL is a low-melt polyester, which makes it energy-efficient for processing but also means it needs careful storage to prevent issues like pellet fusion. It's available as pellets, microbeads, and aqueous dispersions, each with its own handling needs. Let's dive into what you need to know for storing PCL effectively.

Can you store it in a poly tank?

Yes, you can store PCL pellets in HDPE or XLPE tanks, but make sure they are insulated to prevent melting. For caprolactone monomer, stainless steel is recommended due to its liquid state and specific handling requirements.

Watch Out for Temperature

PCL's low melting point (58-62°C) is great for processing but can cause storage issues. In hot climates, the temperature inside a bulk silo can exceed this, leading to pellet fusion and bridging. Insulation and temperature control are key to preventing this.

The safety that actually matters

• Ensure tanks are insulated to manage temperature.
• Use static-dissipative liners to prevent static buildup.
• Match gaskets to the manufacturer chart for compatibility.
• Ground aluminum conveying tubes to prevent static discharge.

Common questions

Can PCL be stored outdoors?

Yes, but the silo must be insulated to prevent temperature-related issues.

What gasket materials are best for PCL?

EPDM gaskets work well for pellets, while Viton is preferred for caprolactone monomer.

Is drying required before processing PCL?

No, PCL is not highly hygroscopic, so drying isn't typically necessary.