Aluminum Diethylphosphinate(ADP)

Aluminum Diethylphosphinate abbreviated as ADP, is an organic aluminum hypophosphite flame retardant with a decomposition temperature of up to 360℃. ADP can be used for flame retardant modification of materials such as PA6/66, low-smoke halogen-free cables and wires, polyester PEB/PBT, TPE, TPU, and EVA. ADP CAS number is 225789-38-8. The phosphorus in the molecular structure of Aluminum Diethylphosphinate is organic phosphine, with a content of 23%. It can be blended with flame retardants such as MCA, aluminum hydroxide, and PPO to achieve synergistic flame retardancy. Its flame retardant mechanism involves creating a carbon layer for isolation and flame retardation. Aluminum diethylphosphinate exhibits extremely low water solubility, with a pH of 4-5 and a particle size D50 of 3-5μm. It is an excellent halogen-free flame retardant characterized by high-temperature resistance, environmental friendliness,and excellent dispersibility.

Basic Information

English Name: Aluminum Diethylphosphinate (ADP)

Molecular Formula: (C4H10O2P)3.Al

Molecular Weight: 390.27

CAS No.: 225789-38-8

HS Code: 2931909090

Appearance: White powder

Product Features

1.Halogen-free and phosphate-free, classified as a green, organic, eco-friendly halogen-free flame retardant with excellent thermal stability and shear resistance.

2. Low smoke density, no migration, superior mechanical properties, and good color retention.

3.Ultra-fine Aluminum Diethylphosphinate(ADP) features a finer surface texture, high dispersibility, and uniform coating, achieving superior dispersion in soft rubber materials such as TPE, TPU, and EVA.

4.ADP Can be used alone or blended with other halogen-free flame retardants, organosilicon compounds, or phosphorized EP for enhanced flame retardancy.

Product Specifications

Purity: >99%

Phosphorus Content: 23.0-24.0%

Moisture Content: ≤0.5%

Density (20℃): 1.2–1.4 g/cm³

Bulk Density: 0.5–0.7 g/cm³

Particle Size D50 (µm): 3-5

pH: 4-5

Decomposition Temperature (TGA 1% loss on weight): >350℃

Applications and Flame Retardant Formulations

1. Flame Retardancy of PA6 Using ADP and MCA

When the mass ratio of Aluminum Diethylphosphinate(ADP) to MCA is 85:15, a 10% addition of the blended flame retardant achieves UL94 V-0 vertical flame rating.

2. ADP and Triazine Carbonizing Agent for PBT Flame Retardancy

Aluminum Diethylphosphinate:triazine carbonizing agent=7:3. With 10% flame retardant addition, vertical burning rating reaches UL94 V-0.

3. Halogen-free TPE dark-colored flame-retardant formulation for cables 

15% PPO+10% ADP (model LXF-A1N03) + 20% MCA flame retardant. TPE material passes 6.0mm UL94 V-0 rating; finished wire passes UL1581 VW-1

4. ADP and MPP flame retardants for nylon PA6/PA66 

10-15% aluminum diethyl phosphite (model LXF-A1N25), 2-8% MPP flame retardant, 15-30% glass fiber addition, PA flame retardancy achieves UL 94 V-0 (1.6mm)

Model and Application

1. LXF-A1N03: Primarily used for flame retardancy in halogen-free TPE dark formulations, white formulations, and EVA formulations for cables. Can be synergistically blended with flame retardants such as MCA, PPO, and aluminum hydroxide.

2. LXF-A1N25: Primarily used for flame retardancy in PA6/PA66, PBT, and similar materials. Typically blended with MPP, aluminum phosphite, MCA, etc., and can replace OP1230/OP1240.

3. Aluminum Diethylphosphinate LXF-A1N08: Used alone or in blends for flame retardancy in adhesives, coatings, and similar materials. Features finer particle size and superior dispersibility.

4. Ultra-fine particle size ADP (D98 < 3μm) available upon request for specialized industry flame retardancy applications.

Packaging&Storage

25/20 kg paper-plastic composite bags with inner plastic liners. Store in dry, ambient conditions. Keep separate from other chemicals.

When flame-retarding nylon PA and polyester PBT with Aluminum Diethylphosphinate, use short glass fibers if glass reinforcement is added, based on relevant data. In certain nylon flame-retardant formulations containing melamine polyphosphate (MPP), due to the tendency of domestic MPP to exhibit gray discoloration, it is recommended to add a small amount of aluminum phosphite or switch to BASF Melapur® 200/70. Concurrently, a small amount of thermal stabilizer LX-HS2109 may be added to reduce PA thermal decomposition. In Aluminum Diethylphosphinate(ADP) flame retardant processing, it is generally recommended to feed the compound flame retardant through the front inlet, short glass fibers through the rear inlet, and the main plastic material and additives through the main inlet.