- ▸ Halogen-free flame retardant for glass-fiber-reinforced polyamides (PA6, PA66) used in electrical and electronic connectors, switches, and circuit-breaker housings.
- ▸ Flame-retardant additive for thermoplastic polyesters (PBT, PET) to achieve UL 94 V-0 ratings in E&E components and automotive parts.
- ▸ Used in combination with synergists such as melamine polyphosphate or zinc borate to enhance char formation and intumescent performance in engineering resins.
- ▸ Incorporated via compounding/extrusion at typical loadings of 15-25% to meet stringent low-smoke, low-corrosivity fire-safety standards in electronics.
- ▸ Applied where halogen-free flame retardancy is required to meet RoHS, WEEE, and OEM environmental specifications for plastic enclosures.
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →
Aluminum diethylphosphinate (ADP) is a halogen-free metal phosphinate — the leading non-halogen flame retardant for glass-filled engineering plastics such as polyamide (PA) and PBT. It works in the condensed phase and is usually paired with a nitrogen synergist. Identity: PubChem / CAS 225789-38-8.
What it is
Aluminum diethylphosphinate (CAS 225789-38-8) is a white, high-melting powder. Its thermal stability lets it survive the high processing temperatures of engineering thermoplastics where many flame retardants decompose.
How it performs in fire
It acts in the condensed phase, forming a phosphorus-rich char layer, and is highly efficient in glass-fiber-reinforced PA and PBT. It is normally combined with a nitrogen synergist such as melamine polyphosphate for a phosphorus-nitrogen effect.
Applications
ADP is used as a halogen-free flame retardant in glass-filled polyamide (PA6, PA66), PBT and other engineering thermoplastics for electrical and electronic parts (connectors, housings). Pair with a nitrogen synergist such as melamine-based products; see the flame retardants guide.
Forms, grades and handling
ADP is supplied as a white powder in bags and bulk. Properties are typical reference values; the Certificate of Analysis (CoA) for the lot you buy governs. Handle per the current Safety Data Sheet (SDS), and confirm regulatory status and restrictions for your market and end use — flame-retardant regulation evolves. Each lot ships with CoA, TDS and SDS.
Bulk supply and RFQ
RawSource sources Aluminum Diethylphosphinate direct from producers in bulk, with CoA, TDS and SDS per lot. Tell us your polymer or system, the fire test you must pass, your maximum loading, and whether the application must be halogen-free, and we will quote the right grade. See the full range and selection logic in the flame retardants guide.
Typical Properties
Typical reference values, not a specification; the Certificate of Analysis (CoA) for the lot governs.
| Property | Typical Value |
|---|---|
| Chemical / class | Flame retardant (halogen-free metal phosphinate) |
| Flame-retardant type | Metal phosphinate (halogen-free) |
| Role in fire performance | Condensed-phase char (engineering plastics) |
| CAS Number | 225789-38-8 |
| Molecular Formula | C12H30AlO6P3 |
| Molecular Weight | 390.27 g/mol |
| Handling | Refer to the current SDS |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 428-310-5
TSCA Inventory flag PMN: a commenced PMN (premanufacture notice) substance (EPA flag legend).
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Frequently Asked Questions
What is aluminum diethylphosphinate (ADP) used for?
Aluminum diethylphosphinate (CAS 225789-38-8) is a halogen-free metal phosphinate flame retardant for glass-filled engineering plastics such as polyamide and PBT, used in electrical/electronic parts; it works in the condensed phase and is paired with a nitrogen synergist.
Is aluminum diethylphosphinate halogen-free?
Yes — it is a phosphorus-based, halogen-free flame retardant, valued precisely because it meets fire ratings in engineering plastics without halogen.
How is bulk aluminum diethylphosphinate supplied and quoted?
RawSource supplies aluminum diethylphosphinate in bulk with CoA, TDS and SDS per lot. Pricing is quote-based on grade and volume; submit an RFQ with your target quantity, polymer/system and the fire test you must pass.
What is the REACH and TSCA regulatory status of Aluminum Diethylphosphinate?
Aluminum Diethylphosphinate (CAS 225789-38-8) is subject to U.S. TSCA Inventory requirements; supplying it into the EU requires valid REACH registration ((EC) No 1907/2006). RawSource cannot verify a third-party supplier's registrations — buyers should require documented TSCA and REACH compliance for their jurisdiction and volume (EC 428-310-5).