Product Introduction
High Whiteness Aluminum Hydroxide (ATH) is white powder, non-toxic, tasteless, good liquidity, high whiteness , soluble in strong acid and alkali, stable under atmospheric temperature and can be easily decomposed into Aluminium oxide when heated. According to different granularity, ATH is widely used as artificial marble and artificial onyx filler, abrasive, flame retardants and for dditive of plastic, rubber industry etc., such as a filler in toothpaste, artificial onyx and artificial marble, low voltage isolators, a retardant filler in low voltage isolators, a retardant filler in plastics, rubber and glass-reinforced fibre.
Aluminum hydroxide is an inorganic environmental-friendly type flame retardant for additive of plastic, rubber etc.; basic materials in paper making, coatings and toothpaste; carriers of catalysts; also used in water purifier, fluorides, dyers, pharmacy, building materials etc. It can prevent fuming, no drops, no generation of toxic or corrosive gases and has self-extinguish ability and smoke suppressing properties.
Synonym: Aluminium hydrate; Alumina trihydrate; Aluminium trihydrate ATH; Hydrated Alumina
CAS NO.: 21645-51-2
Molecular Formula: Al(OH)3
Key Features & Advantages
- High Whiteness (≥ 97%) – Provides brighter, more visually attractive end products
- Excellent Thermal Stability – Enables flame resistance and thermal protection
- High Purity (Al(OH)₃ ≥ 99.5%) – Consistent quality across batches
- Low Oil Absorption – Improves filler dispersibility and surface quality
- Custom Particle Size Options – From 1–25 µm (or upon request)
- Environmentally Friendly – Halogen-free flame-retardant solution
Technical Specifications
High whiteness aluminum hydroxide for filler (Seeding process)
It is produced by precipitaion method with the sodium aluminate solution from sintering process as the seeds, its characteristics – Slow decomposition rate, complete crystallization, low impurity, high intensity and good transparency.
It has the texture properties of jade, which can be used as superior filler in the solid surface, crafts and other composites.
| Brand | Chemical composition（%） | DOP | Whiteness | Particle size | Moisture | |||||
| Al(OH)3≥ | SiO2≤ | Fe2O3≤ | Na2O≤ | Na2O (S)≤ | ml/100g≤ | %≥ | D50μm | +325mesh≤ | %≤ | |
| H-WF-14SP | 99.6 | 0.03 | 0.02 | 0.20 | 0.02 | 30 | 95 | 16±3 | 12 | 0.3 |
| H-WF-25SP | 99.6 | 0.03 | 0.02 | 0.20 | 0. | 30 | 94 | 25±5 | – | 0.2 |
| H-WF-25MSP | 99.6 | 0.03 | 0.02 | 0.20 | 0.03 | 21 | 95 | – | – | 0.2 |
| H-WF-50SP | 99.6 | 0.03 | 0.02 | 0.20 | 0.02 | 30 | 93 | 50±10 | – | 0.2 |
| H-WF-75SP | 99.6 | 0.03 | 0.02 | 0.20 | 0.02 | 30 | 92 | 85±15 | – | 0.1 |
| H-WF-90SP | 99.6 | 0.03 | 0.02 | 0.20 | 0.02 | 30 | 91 | 95±20 | – | 0.1 |
High whiteness aluminum hydroxide for filler (Carbonating process)
High whiteness(Reputated as China White), low oil absorption, good stability at room temperature and dehydrated to alumina while heating, to make the products have the function of flame retardant. Its a good flame retardant filler because that no toxic and corrosive gases were generated in thermal decomposition.It’s widely used in the solid surface, mould plastics, epoxy potting compound and other composite materials.
| Brand | Chemical composition（%） | DOP | Whiteness | Particle size | Moisture | |||||
| Al(OH)3≥ | SiO2≤ | Fe2O3≤ | Na2O≤ | Na2O(s)≤ | ml/100g≤ | %≥ | D50μm | +325mesh≤ | %≤ | |
| H-WF-8 | 99.6 | 0.05 | 0.02 | 0.30 | 0.03 | 33 | 96 | 8±2 | 3 | 0.4 |
| H-WF-10 | 99.6 | 0.05 | 0.02 | 0.30 | 0.03 | 33 | 96 | 10±2 | 4 | 0.3 |
| H-WF-14G | 99.6 | 0.05 | 0.02 | 0.30 | – | 30 | 90 | 11±3 | – | 0.3 |
| H-WF-14LV | 99.6 | 0.05 | 0.02 | 0.30 | 0.03 | 29 | 95 | 13±3 | 15 | 0.3 |
| H-WF-14 | 99.6 | 0.05 | 0.02 | 0.30 | 0.03 | 32 | 95 | 15±3 | 15 | 0.3 |
| H-WF-15A | 99.6 | 0.04 | 0.01 | 0.20 | 0.03 | 32 | 98 | 13±2 | – | 0.3 |
| H-WF-25 | 99.6 | 0.05 | 0.02 | 0.30 | 0.03 | 32 | 95 | 25±5 | – | 0.2 |
| H-WF-75 | 99.6 | 0.05 | 0.02 | 0.25 | 0.03 | 40 | 93 | 85±15 | – | 0.1 |
| H-WF-90 | 99.6 | 0.05 | 0.02 | 0.25 | 0.02 | 40 | 93 | 100±20 | – | 0.1 |
| H-WF-100 | 99.6 | 0.1 | 0.02 | 0.30 | – | 40 | 90 | ≥90 | – | 0.1 |
Applications of High Whiteness ATH
- Applications of High Whiteness ATH
- Plastics & Polymers:
- High Whiteness Aluminum Hydroxide (ATH) is widely used as a flame-retardant and smoke-suppressant filler in thermoplastics and thermosets. Its fine particle size and neutral color help maintain surface smoothness, mechanical strength, and overall brightness. It is ideal for applications in cables, automotive parts, housings, and other plastic goods that must adhere to strict fire safety and durability standards.
- Coatings & Paints:
- High Whiteness ATH is highly valued in the coatings and paints industries due to its exceptional thermal stability and neutral color. It improves the brightness, surface finish, and flame resistance of paints and decorative finishes. Its ability to reduce smoke and toxicity during combustion makes it ideal for architectural, automotive, marine, and aerospace coating formulations.
- Rubber:
- In the rubber industry, High Whiteness ATH acts as a flame-retardant and reinforcing filler. Its fine particle structure improves tensile strength, durability, and resistance to wear and thermal aging. It is used in a variety of applications, including conveyor belts, gaskets, automotive tires, and industrial hoses.
- Adhesives & Sealants:
- High Whiteness ATH provides flame resistance, thermal protection, and mechanical stability in adhesives and sealants. Its inclusion allows formulations to meet stringent safety standards, making it ideal for construction adhesives, electrical and thermal insulation sealants, and other bonding products where flame resistance is critical.
- Other Applications:
- High Whiteness ATH is used in a range of other industries due to its versatility and reliability. In electrical cables, it serves as a flame-retardant and smoke-suppressant filler. In electronics, it improves thermal dissipation and flame resistance in housings and components. In engineered composites, it delivers superior strength, thermal stability, and safety characteristics for high-performance applications across aerospace, automotive, and construction sectors.
Why Choose Our High Whiteness ATH?
- Consistent Quality with Strict Quality Control
- Excellent Whiteness for High-Value End Products
- Custom Solutions Tailored to Your Needs
- Reliable Supply and Competitive Pricing
- Exporting to 30+ Countries Worldwide
Packaging & Storage
- Standard seaworthy packing in 25kgs bag/ 50kgs bag/1000kgs Jumbo bags;
- 25 kgs bag,1200 kgs on one pallet, 24mt per container.
- It should be stored under cover in a cool, dry place; the bags should not be stacked more than 15 bags
Frequently Asked Questions (FAQ)
- Q1: What is the CAS number of High Whiteness Aluminum Hydroxide?
- A: CAS No.: 21645-51-2
- Q2: What industries benefit from High Whiteness ATH?
- A: Primarily plastics, paints, rubber, adhesives, electronics, and sealants
- Q3: What particle sizes are available?
- A: 1–25 µm or custom upon request
- Q4: Is High Whiteness ATH flame-retardant?
- A: Yes, it's halogen-free and provides excellent flame and thermal resistance
Get a Quote Today
Looking for High Whiteness Aluminum Hydroxide (CAS No. 21645-51-2)? Contact us now for pricing, free samples, or custom specifications. Let’s help you achieve brighter, stronger, and flame-retardant products!
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