Aluminum Hypophosphite (AHP) is a highly efficient, halogen-free, phosphorus-based flame retardant. It is characterized by its high phosphorus content and exceptionally high thermal stability (decomposing >350°C).

Flame Retardant Mechanism AHP exhibits a powerful dual-action mechanism (gas and condensed phase):

1. Gas Phase Action: Upon heating, it releases phosphinic acid (H3PO2), which vaporizes and generates phosphorus-based radicals (PO, HPO). These are extremely effective at trapping (quenching) the high-energy H• and OH radicals that propagate the flame.

2. Condensed Phase Action: The phosphoric compounds formed also catalyze dehydration and cross-linking on the polymer surface, promoting the formation of a stable, insulating char layer.

Key Application Areas

• High-Temperature Engineering Plastics: Its high thermal stability makes it one of the few P-based FRs suitable for PBT, PET, and Polyamides (PA6, PA66).

• High-Performance TPUs: Highly effective in thermoplastic polyurethanes (TPUs).

• Thermosets: Used in epoxy resins and other high-temperature thermosets.