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| Synonyms:Aluminum phosphate monobasic Primary aluminum phosphate Aluminum acid phosphate Mono aluminium phosphate Molecular Formula: Al(H2PO4)3 Molecular Weight: 317.94 HS Code: 2835299000 Grade: Industrial grade liquid 33% solid 65% Hazard Class:solid-General Cargo;liquid—Class8 | |||||||||
13530-50-2
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13530-50-2
Aluminum dihydrogen phosphate (ADP) is an acid aluminum phosphate with the formula Al(H₂PO₄)₃ — an inorganic binder with a rare combination of cold adhesion and high-temperature ceramic bonding. Supplied as a colorles solution (the industrial standard) or as a solid, it bonds refractory aggregates at room temperature and converts on heating into aluminum-phosphate ceramic with service stability to about 1300 °C.
That dual behavior makes ADP the workhorse chemical binder of high-temperature industry: it holds together monolithic refractories, furnace linings and refractory bricks; it imparts flame resistance to paints, fibers and wood; it strengthens honeycomb ceramics and casting shells; and it bonds corundum, silicon carbide and other aggregates in high-temperature adhesives. One binder, the inorganic glue of thermal engineering.
A single binder, four core value propositions:
Refractory Binders:
● the chemical binder of monolithic refractories, furnace linings and refractory bricks, stable to ≈ 1300 °C;
Fire-Retardant Coatings:
● a flame-retardant and intumescent coating component for paints, fibers, wood and paper;
Ceramics & Casting:
● a binder for honeycomb ceramics and phosphate investment-casting shells with improved strength;
High-Temperature Adhesives & Specialty:
● a high-temperature adhesive and binder for electrical insulation, composites and special products.
Item | Specification |
Chemical Name | Aluminum dihydrogen phosphate (Monobasic aluminum phosphate) |
Synonyms | ADP; Monoaluminum phosphate; Aluminum phosphate monobasic; Aluminum dihydrogen orthophosphate; Acid aluminum phosphate |
CAS No. | 13530-50-2 |
EC No. (EINECS) | 236-875-9 |
Molecular Formula | Al(H₂PO₄)₃ (AlH₆O₁₂P₃) |
Molecular Weight | 317.94 g/mol |
Solubility | Freely soluble in water |
Service Temperature | Stable in refractory service up to ≈ 1300 °C (ceramic bonding) |
Forms | solution (standard), solid/powder grades |
ADP is the acidic (monobasic) phosphate of aluminum: three dihydrogen phosphate groups per aluminum. At room temperature it wets and bonds refractory aggregates by adhesion and hydrogen bonding; as temperature rises, it undergoes progressive condensation — releasing water and converting into aluminum metaphosphate and finally aluminum orthophosphate (AlPO₄) — forming a rigid, refractory ceramic bond. This staged transformation is what gives ADP-bound refractories their strength from 200 °C up to ≈ 1300 °C.
● Cold bond plus ceramic bond: adheres at room temperature and strengthens into refractory ceramic on heating.
● Outstanding thermal stability: maintains bond integrity in service up to ≈ 1300 °C.
● Excellent refractory performance: heat-, thermal-shock- and corrosion-resistant, resistant to hot-gas erosion.
● Strong green and fired strength: high adhesive strength from ambient to service temperature.
● Effective flame retardancy: imparts fire resistance to coatings, fibers, wood and paper systems.
● Multi-industry reach: refractories, fire protection, ceramics, casting, electrical and composites.
1 Refractory Binders (Core Application)
ADP is the standard chemical binder of modern refractory technology:
● Monolithic refractories: binder for castables, ramming mixes and gunning mixes;
● Furnace linings: bonds linings of industrial kilns, heat-treatment furnaces and electric furnaces;
● Refractory bricks and shapes: chemical bond in unburned and phosphate-bonded bricks;
● Steel and thermal plants: linings for ladles, soaking pits and high-temperature process equipment.
2 Fire-Retardant Coatings & Treatment
● Intumescent fire-retardant paints: binder and char-forming component;
● Fiber, wood and paper treatment: impregnation imparting flame resistance;
● High-temperature coatings: heat-stable coating for equipment and structures;
● Insulation materials: fire-resistant bonding of insulating boards and blankets.
3 Ceramics & Precision Casting
● Honeycomb ceramics: binder for catalyst and filter honeycomb substrates;
● Investment casting: phosphate binder for ceramic shells and molds;
● Ceramic products: strengthens bodies, improving high-temperature compressive and flexural strength;
● Foam ceramics: binder in cellular-ceramic manufacture.
4 High-Temperature Adhesives & Specialty Applications
● High-temperature adhesives: bonds corundum, silicon carbide, mullite and aggregate systems;
● Electrical insulation: binder for insulating components and heat-treatment fixtures;
● Composites and special products: binder for engineered refractory composites;
● Coating systems: adhesive binder for refractory paints and sprays.
Packaging (customizable):
● Solution: 25 kg HDPE jerry can, 250 kg HDPE drum, 1,000 L IBC, or ISO tank for bulk;
● Solid: 25 kg fiber drum with PE liner
Storage:
● Keep in a cool, dry, well-ventilated area away from direct sunlight and heat;
● Keep containers tightly closed to prevent water loss, concentration drift and contamination;
● Protect solution from freezing; store away from alkalis and incompatible materials;
● Recommended storage temperature 5 °C – 35 °C.
● Factory-direct supply: own production capacity, transparent pricing, no middleman markup;
● Stable quality: strict internal control, every batch tested, COA with every shipment;small trial orders accepted.
● Export experience: familiar with sea/air shipping documentation for chemical commodities, complete paperwork support;
ADP is used as the chemical binder of monolithic refractories, furnace linings and refractory bricks; as a flame-retardant component of intumescent paints and fiber/wood impregnation; as a binder for honeycomb ceramics and phosphate investment-casting shells; and in high-temperature adhesives and electrical insulation.
ADP bonds in two stages. At room temperature it wets aggregates and bonds them by adhesion and hydrogen bonding — giving green strength. On heating, the acidic phosphate condenses, releasing water and converting progressively into aluminum phosphate ceramic (AlPO₄), forming a strong, rigid refractory bond that remains stable to about 1300 °C. This staged bonding is why ADP-bound refractories work across the whole service range.
ADP solution is acidic and corrosive — it can cause skin burns and serious eye damage, and heating or acid contact can release irritating fumes. Use gloves, goggles and protective clothing, avoid skin and eye contact, and handle spills per MSDS. It is an industrial chemical, not a food ingredient; protective and hygiene precautions apply in all applications.
