PBI Powders

Product Description

Polybenzimidazole (PBI) powder is a high-performance thermoplastic polymer widely recognized for its exceptional thermal resistance, outstanding chemical stability, and superior mechanical strength. Unlike conventional thermoplastics, PBI retains its dimensional integrity and mechanical performance at temperatures exceeding 400 °C and under chemically aggressive environments.

PBI powder is produced via a high-temperature polycondensation reaction between aromatic tetraamines—such as 3,3′-diaminobenzidine (DAB)—and aromatic dicarboxylic acid derivatives, commonly diphenyl isophthalate or isophthalic acid. The synthesis process is carried out under strictly controlled conditions to promote optimal chain growth and to achieve desired polymer properties. After polymerization, the PBI is precipitated, thoroughly washed, dried, and milled into a fine powder with a consistent and well-controlled particle size and molecular weight distribution.

At Alfa Chemistry, our PBI powders are engineered with narrow molecular weight distributions, offering high consistency and performance reproducibility. We supply PBI powders with molecular weights of 60,000, 100,000, 200,000, and higher, depending on the specific application needs.

Our high-molecular-weight PBI powders are specifically optimized for applications such as:

• Membrane Electrode Assemblies (MEAs) for proton exchange membrane (PEM) fuel cells
• Proton-conductive membranes in hydrogen fuel cells and flow batteries
• High-strength gas separation films used in hydrogen purification and CO₂ capture
• Coatings and composite matrices for aerospace and defense industries

• Color: Brown powder
• Materials: PBI
• Industries: MEAs, PEMs, flow battery components and other high-strength films

Product Specifications

Catalog	Product	Molecular Weight	Solubility and Film Forming	Thermal Stability
PL-PBI-A001	PBI Powder	60,000 g/mol	Excellent	≥450℃
PL-PBI-A002	PBI Powder	100,000 g/mol	Excellent	≥450℃
PL-PBI-A003	PBI Powder	200,000 g/mol	Excellent	≥450℃

*PBI powder with other molecular weights can be custom-synthesized according to customer requirements.

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