Aluminum Diethylphosphinate (ADP)

Aluminum diethylphosphinate, abbreviated ADP, is an aluminum salt of diethylphosphinic acid. This halogen-free powder is selected for phosphorus-based flame-retardant packages in engineering plastics and reactive resin systems. It is a different material from ammonium polyphosphate and should be compared on phosphorus chemistry, processing needs and compatibility.

The 2026 supply TDS specifies phosphorus ≥23.0%, moisture ≤0.50%, median particle size 20–40 µm and temperature at 1% mass loss ≥390°C. Density about 1.35 g/cm³ and bulk density 400–600 kg/m³ are typical properties. A thermogravimetric mass-loss temperature is not a recommended continuous processing temperature.

For reinforced polyamides, PBT and PET, evaluate resin drying, feeder consistency, particle dispersion and interaction with the full additive package. Test fire performance at the intended thickness while retaining the required electrical and mechanical properties. An additive listing does not establish a UL 94 rating for the final compound.

Thermoset use requires an independent assessment of viscosity, cure response, filler interactions and cured performance. Control powder exposure and environmental release. Dangerous-goods transport and chemical hazard labelling are separate: the transport reference is non-dangerous goods, while current EU classification identifies persistence and mobility in water resources.

See related plastics and rubber chemicals in our catalog.