Polyhydroxybutyrate (PHB / PHBV / PHA) Pellet Storage Tank Selection

Storing Polyhydroxybutyrate? Start Here

Polyhydroxybutyrate (PHB) is a bio-polyester made through bacterial fermentation. It's popular for eco-friendly packaging, compostable films, and medical applications due to its biodegradability. When storing PHB, it's important to keep it dry and manage its thermal history to prevent degradation. PHB is typically stored as crystalline pellets in bags or supersacks.

Can you store it in a poly tank?

Yes, PHB pellets can be stored in high-density polyethylene (HDPE) or cross-linked polyethylene (XLPE) tanks, especially for outdoor silos. However, ensure these tanks have a static-dissipative liner and a desiccant breather to protect the material from moisture.

Key Issue: Moisture Control

PHB is sensitive to moisture, which can affect its quality and processability. It's crucial to store it in conditions that exclude moisture, using desiccant breathers and ensuring tanks are tightly sealed.

The safety that actually matters

• Ensure tanks are equipped with static-dissipative liners to prevent static buildup.
• Use desiccant breathers to manage moisture levels.
• Verify that all materials in contact with PHB are food-grade if applicable.

Common questions

Can PHB be stored in carbon steel tanks?

Carbon steel is acceptable for non-food bulk silos but should not be used for product-contact zones.

What gaskets should be used with PHB storage?

EPDM gaskets are standard for tank-flange and manway seals.

Is PHB suitable for marine-degradable applications?

Yes, PHB is uniquely positioned for marine-degradable single-use items, unlike PLA.