Polyhexamethylene biguanide

Polyhexamethylene biguanide (CAS 28757-47-3), commonly known as PHMB, is a polymeric antimicrobial agent used to control bacterial, fungal, and algal contamination.

Where is Polyhexamethylene biguanide used?

• Water treatment: alternative to chlorine-based biocides in swimming pools, cooling towers, and process water systems
• Personal care: preservative in rinse-off and leave-on products including contact lens solutions, wound cleansing preparations, and skin antiseptics
• Textile and leather: durable antimicrobial finishes for fabrics, nonwovens, and treated surfaces
• Industrial and institutional cleaning: hard surface disinfectants and sanitizers for healthcare, food processing, and veterinary environments
• It functions as a broad-spectrum biocide effective at low concentrations.

Good to know: Buyers should confirm active content and compliance with relevant regional regulatory listings, including EU Biocidal Products Regulation.

Commercial specifications

• Aqueous solution, most commonly at 20% active concentration