Aluminum Hypophosphite ALHP Phosphinic acid aluminum salt CAS 7784-22-7

Tree Chem manufactures Aluminum Hypophosphite CAS 7784-22-7 for customers who want to purchase high-purity phosphorus-based additives used in flame-retardant systems and functional material formulations. The product features high hypophosphite content, excellent whiteness, and stable decomposition temperature, supporting consistent performance in demanding applications.

Aluminum Hypophosphite is commonly applied in halogen-free flame-retardant systems, engineering plastics, and specialty chemical synthesis. Tree Chem provides export-compliant packaging and maintains strict quality control to meet international supply requirements. For technical details or procurement support, please email info@cntreechem.com.

Specification

Basic Information

Technical Specification

Applications

Halogen-Free Flame Retardancy for Plastics and Polymer Compounding

• Aluminum hypophosphite is positioned in the file as a high-phosphorus, halogen-free inorganic flame retardant used to meet tightening environmental requirements where traditional halogen systems are being limited. In polymer compounding, its value comes from high flame-retardant efficiency at comparatively low addition in some systems, plus a decomposition profile that contributes non-flammable phosphate species and heat-absorption effects during burning. These behaviors support reduced ignition tendency and improved self-extinguishing performance when the formulation and processing window are properly controlled.
• In polypropylene, the file presents a low-dosage composite approach in which aluminum hypophosphite is used together with a synergist and a char former to reach a targeted UL94 level with around 1% total flame-retardant package. This type of design highlights that for non-polar matrices, aluminum hypophosphite is typically used as part of a coordinated system rather than as a stand-alone additive, with carbon-layer formation playing a key role in achieving stable flame resistance.
• For polyamides, the file emphasizes higher loadings and the benefit of microencapsulation to improve thermal stability and processing safety, especially to reduce unwanted gas release during melt processing. In glass-fiber-reinforced PA6, a microencapsulated aluminum hypophosphite system is described at meaningful loading where UL94 V-0 is achieved at typical thickness, while also managing dripping and stabilizing flame-retardant performance. This positioning aligns with the practical need for engineering plastics to maintain flame performance while still meeting mechanical property requirements.
• In PBT, the file describes phosphorus–nitrogen synergy as a core strategy, where aluminum hypophosphite is paired with a nitrogen source (for example, melamine cyanurate) and optionally reinforced with glass fiber and small amounts of processing aids and antioxidants. The document also notes that ratio control inside the flame-retardant package matters, and that blending aluminum hypophosphite with other phosphorus systems at defined ratios can still deliver V-0 performance. For TPE cable compounds, the file highlights a mid-range loading window where aluminum hypophosphite provides primary flame retardancy and a nitrogen synergist enhances overall effect, supporting cable applications that demand both flexibility and flame safety.

Synergistic Systems and Formulation Engineering

• The file outlines that aluminum hypophosphite can be combined with multiple synergist families to increase efficiency, lower overall addition, or balance processing and mechanical performance. A phosphorus–nitrogen route is described as the most common, where aluminum hypophosphite supplies phosphorus while nitrogen donors release non-flammable gases and promote intumescence, improving char quality and reducing oxygen availability around the flame zone. This synergy is presented as capable of improving flame-retardant efficiency significantly when the blend ratio is optimized.
• A second synergy pathway described involves metal hydroxides, where aluminum hydroxide contributes endothermic dehydration and water-vapor dilution while aluminum hypophosphite contributes protective condensed-phase chemistry. This design is positioned for scenarios that must preserve mechanical properties while still improving flame resistance, because the heat-sink effect of metal hydroxides can help reduce peak temperatures and slow decomposition.
• The file also introduces catalyst-type synergies and structural synergies, such as metal-organic frameworks or carbon materials. These components are described as helping strengthen the char layer, reduce heat release, and refine combustion pathways. In addition, surface treatment is presented as an enabling technology: coupling agents and surfactants are used to improve dispersion, compatibility, and long-term stability in polymers and coatings, reducing the risk of migration, agglomeration, or performance inconsistency.

Fire-Protective and Anti-Corrosion Coatings

• In coatings, aluminum hypophosphite is described as both a flame-retardant ingredient and a functional filler, especially within intumescent fireproof systems. The file provides examples for steel-structure fireproof coatings where aluminum hypophosphite supports the acid-source/char-source/gas-source architecture by offering additional phosphorus contribution, helping generate an expanded char layer that insulates the substrate from heat and oxygen. This role is positioned as improving the effectiveness and robustness of the intumescent barrier under high temperature exposure.
• Waterborne intumescent fireproof coatings are also highlighted, where aluminum hypophosphite is included at lower parts alongside polymer binders, modified ammonium polyphosphate systems, carbon sources, blowing agents, corrosion-inhibiting pigments, and rheology/dispersion additives. In this framing, aluminum hypophosphite contributes both flame performance and improvements in durability attributes such as water resistance, weathering behavior, and adhesion, which are critical for coatings that face humidity, salt spray, or outdoor cycling.
• For anti-corrosion coatings, the file positions aluminum hypophosphite as a corrosion-inhibiting filler that can help form a denser barrier and slow penetration of corrosive media. It is also presented in “dual-function” coatings that must meet both halogen-free flame retardancy and corrosion protection, such as petrochemical storage, offshore structures, and industrial assets where fire safety and long-term corrosion control must be addressed together.

Electronics, Encapsulation, and PCB Materials

• The file describes a strong application footprint in electronic encapsulation where materials must deliver halogen-free flame resistance under thermal stress. Aluminum hypophosphite is presented as suitable for epoxy potting compounds and packaging materials at significant loading, enabling UL94 V-0 performance while remaining compatible with electronic insulation needs. In these systems it can also serve as part of a thermally functional filler blend, supporting both safety and thermal management goals.
• For electronic-grade applications, the file stresses higher purity expectations and tighter impurity control to protect device reliability. Low sodium, low iron, controlled chloride, and very low heavy metals are described as key requirements, reflecting electronics manufacturing sensitivity to ionic contamination and corrosion risks. This positions aluminum hypophosphite not only as a flame retardant, but also as a material that must be produced and qualified to electronics-specific standards.
• In PCB materials, the file describes use in halogen-free flame-retardant laminates and solder-mask systems. It also introduces aluminum-base PCB insulation layers where aluminum hypophosphite contributes flame performance while improving thermal conductivity when paired with ceramic fillers. This pairing is described as supporting higher heat dissipation in power electronics where insulation layers must transfer heat effectively without sacrificing electrical insulation or flame safety.

Rubber, Textiles, Paper, and Building Materials

• In rubber compounds, the file describes aluminum hypophosphite as a flame-retardant additive that can raise limiting oxygen index, while also warning that high loadings may negatively affect tensile strength, elongation, tear strength, and abrasion resistance depending on the elastomer system. This presentation highlights the need for formulation balancing through synergists, reinforcement strategy, and processing optimization to preserve performance while achieving targeted flame resistance.
• For textiles, aluminum hypophosphite is presented as a flame-retardant finishing component used via impregnation or coating approaches, where the formulation includes a dispersion medium plus binders, crosslinkers, and softeners to lock the flame-retardant phase onto fibers. In carpets and synthetic textiles, it can be introduced either into the spinning dope or into backing-coat systems, giving flexibility in manufacturing routes depending on production infrastructure and required flame classification.
• In paper, the file describes direct pulp addition and surface-coating approaches to create fire-resistant papers for specialty uses. In building materials, aluminum hypophosphite is positioned as a flame-retardant filler for wood-plastic composites, fireproof boards, and related assemblies where non-halogen systems are required. It is also presented as a functional additive in ceramics and high-temperature materials where decomposition products can assist sintering behavior and improve refractory characteristics under appropriate processing conditions.

Use Guidance, Safety, and Quality Control in Manufacturing

• The file emphasizes that dosage ranges vary widely across applications, from low composite levels in polyolefins to higher loadings in engineering plastics, coatings, rubber, and textile finishes. Because the material is moisture-sensitive and processing windows are critical, the document highlights practices such as drying before use, avoiding local overheating, and improving polymer compatibility via coupling agents or surface modification to prevent agglomeration and ensure consistent performance.
• Safety controls are also emphasized in the file, including dust control and ventilation, personal protective equipment, and temperature management to reduce risk of decomposition. The document references potential gas formation under high-temperature conditions and therefore promotes monitoring and process discipline, especially in compounding lines and high-shear, high-temperature processes.
• For quality management, the file describes a control framework covering purity, phosphorus content, particle size distribution, moisture, whiteness, and trace impurities, with tighter requirements for electronics-grade material. It also highlights application-stage checks such as dispersion quality, compatibility with other formulation components, and regular flame-retardant performance testing so that the final product meets the targeted standard consistently batch to batch.

Storage & Handling

• Store in a cool, dry, and well-ventilated area.
• Keep containers tightly sealed and protected from moisture.
• Avoid contact with strong oxidizing agents and acids.
• Ensure handling equipment is clean and dry.
• Use appropriate personal protective equipment during handling.

Usage Notice

• Do not expose the product to excessive humidity or direct heat sources.
• Verify compatibility with polymer matrices and additives before formulation.
• Follow local regulations for handling, storage, and disposal.
• A polypropylene UL94 V-2 package containing 0.45% aluminum hypophosphite, 0.45% melamine hydrobromide, 0.1% char-forming additive, and polypropylene to balance functions to reach a V-2 rating with a very low total flame-retardant dosage through synergistic char formation and flame inhibition.
• A glass-fiber-reinforced PA6 V-0 compound containing 20% microencapsulated aluminum hypophosphite, 30% glass fiber, and 50% PA6 functions to achieve UL94 V-0 at typical thickness while suppressing melt dripping and improving processing stability.
• A PBT V-0 formulation containing 15% aluminum hypophosphite, 5% melamine cyanurate, 15% glass fiber, PBT resin to balance, and minor processing aids/antioxidant functions to deliver phosphorus–nitrogen synergy that enables V-0 vertical burn performance.
• A PBT composite system using aluminum hypophosphite blended with an additional phosphorus flame retardant at ratios such as 5:1, 7:1, or 9:1 (with PBT resin and routine stabilizers to balance) functions to reach V-0 performance while tuning heat release and char quality through phosphorus-rich condensed-phase action.
• A TPE cable flame-retardant compound containing 7–12% aluminum hypophosphite, 2% melamine cyanurate, and TPE base resin to balance functions to provide flexible cable flame retardancy with improved performance from nitrogen synergy.
• A steel-structure intumescent fireproof coating containing 20–30% modified epoxy resin, 20–30% ammonium polyphosphate, 10–15% pentaerythritol, 16–24% melamine, 5–10% aluminum hypophosphite, 5–10% heat-resistant fillers, 2.5–5% modified graphene, and 0.3–3% auxiliaries functions to build an expanded char barrier that insulates steel from heat and oxygen during fire exposure.
• A waterborne intumescent fireproof coating containing waterborne epoxy resin, acrylic emulsion, polyurethane emulsion, silicone-modified ammonium polyphosphate, dipentaerythritol, melamine, a graphene–polyacrylic acid–nano-silica composite, pigments/fillers, zinc phosphate, 3–5 parts aluminum hypophosphite, auxiliaries, and water functions to enhance flame resistance while improving coating water resistance, corrosion resistance, and adhesion.
• A transparent epoxy fire-retardant coating containing 85–95% epoxy resin and 5–20% nano-aluminum hypophosphite (≤60 nm) with curing agent to balance functions to reduce peak heat release while maintaining optical transparency within an optimized loading window.
• An epoxy anti-corrosion coating containing 60–70% epoxy resin, 5–10% aluminum hypophosphite, 15–20% pigments/fillers, 10–15% curing agent, and solvent to balance functions to improve barrier compactness and corrosion protection while adding halogen-free flame-retardant contribution.
• A halogen-free flame-retardant anti-corrosion coating containing 40–60% resin binder, 10–20% aluminum hypophosphite, 5–10% additional phosphorus flame retardant, 20–30% pigments/fillers, and 3–5% auxiliaries functions to meet combined flame safety and corrosion-resistance requirements for industrial assets.
• An epoxy potting compound containing 60–70% epoxy resin, 15–25% aluminum hypophosphite, 10–15% curing agent, 5–10% thermally conductive filler, and 2–5% auxiliaries functions to provide UL94 V-0 flame resistance and electrical insulation for electronic encapsulation.
• A halogen-free PCB laminate system containing 40–50% epoxy resin, 15–25% aluminum hypophosphite, 30–40% glass fiber cloth, 5–10% curing agent, and 2–5% auxiliaries functions to replace brominated flame retardants while meeting UL94 V-0 laminate requirements.
• An aluminum-base PCB insulation layer containing 50–60% epoxy resin, 10–15% aluminum hypophosphite, 20–30% alumina filler, and 8–12% curing agent functions to improve flame resistance and raise thermal conductivity for higher-power circuit heat dissipation.
• An NR/BR rubber flame-retardant blend containing 50–60 parts natural rubber, 40–50 parts styrene-butadiene rubber, 35–45 phr aluminum hypophosphite, and a standard vulcanization system functions to raise limiting oxygen index while requiring property balancing due to mechanical-strength trade-offs at high loading.
• A silicone rubber flame-retardant compound containing 100 parts silicone rubber, 15–25 phr aluminum hypophosphite (40% phosphorus grade), and 30–50 phr aluminum hydroxide functions to reach high flame performance through combined condensed-phase phosphorus action and endothermic metal-hydroxide synergy.
• A textile flame-retardant finishing bath containing 20–30% aluminum hypophosphite dispersion, 10–15% binder, 2–5% crosslinker, 3–5% softener, and water to balance functions to impart B1-level flame resistance via pad-dry-cure processing.
• A flame-retardant paper pulp formulation containing 10–15% aluminum hypophosphite (based on pulp solids) functions to reduce paper flammability and produce specialty fire-resistant paper products.
• A wood or wood-plastic composite formulation containing 15–25 parts aluminum hypophosphite per 100 parts substrate functions to improve flame resistance and dimensional stability in building-material applications.

Packaging

• 25 kg fully laminated paper bag with aluminum foil inner liner
• Secure palletized packing for export shipment