Product Characteristics
Aluminum hydroxide for rubber is a commonly used inorganic flame-retardant filler. Its product characteristics and appearance are as follows:
Aluminum hydroxide Flame retardancy
When heated and decomposed, it releases moisture, absorbs heat, and inhibits the combustion of rubber. Meanwhile, the aluminum oxide generated during decomposition can form an insulating layer to prevent the spread of flames.
01
Aluminum hydroxide Filling property
Uniform particle size, capable of filling the rubber matrix, improving the processing performance of the rubber compound (such as fluidity and vulcanization characteristics), and having a relatively small impact on the mechanical properties of rubber (such as strength and elasticity).
02
Aluminum hydroxide Stability
Chemically stable, it is not prone to decomposition at rubber processing temperatures (typically 100-200℃), has good weather resistance, and is not easily affected by environmental factors.
03
Aluminum hydroxide Environmental friendliness
Non-toxic and smokeless, meeting environmental protection requirements. It is suitable for rubber products with high safety requirements in food contact, medical and other fields.
04
Technical Index
Chemical Formula : Al(OH)3
CAS NO. 21645-51-2
EINECS: 244-492-7
General Properties
|
molecular weight |
78 |
Mohs hardness |
3 |
|
Density g/cm3 |
2.4 |
Ratio of refraction |
1.58 |
Physical and Chemical Properties
|
Model Item |
ATHX-1 |
ATH-3 |
ATH-8 |
ATH-10 |
|
Al(OH)3 [%] ≥ |
99.5 |
99.5 |
99.5 |
99.5 |
|
Al2O3 [%] ≥ |
64.5 |
64.5 |
64.5 |
64.5 |
|
SiO2 [%] ≤ |
0.02 |
0.02 |
0.02 |
0.02 |
|
Fe2O3 [%] ≤ |
0.01 |
0.01 |
0.01 |
0.01 |
|
Na2O [%] ≤ |
0.30 |
0.30 |
0.30 |
0.30 |
|
L.O.I ≤ |
35 |
35 |
35 |
35 |
|
Attached water ≤ |
0.4 |
0.4 |
0.3 |
0.3 |
|
+325 mesh 325≤ |
0.01 |
0.01 |
0.01 |
0.01 |
|
oil absorption ≈ |
32 |
32 |
26 |
26 |
|
Mean particle diamete(D50) µ m ≈ |
2.5 |
3.5 |
9 |
10 |
|
Whiteness [R457] ≥ |
95 |
95 |
94 |
94 |
|
PH value ≈ |
9 |
9 |
9 |
9 |
Main Application Fields
Aluminum hydroxide for rubber is widely used in rubber products, mainly due to its flame retardant and filling properties. The specific applications are as follows:
Flame-retardant rubber products
Aluminum hydroxide is used for rubber parts that require fire resistance and flame retardancy, such as cable sheaths, conveyor belts, and seals, like flame-retardant conveyor belts for coal mines and insulation layers of high-voltage cables. It inhibits combustion by decomposing and absorbing heat and isolating oxygen, thereby enhancing safety.
Industrial rubber products
Aluminum hydroxide is filled in rubber hoses, rubber sheets and shock-absorbing parts to improve the processing fluidity of the rubber compound, while enhancing the hardness, wear resistance and dimensional stability of the products, such as sealing rubber strips for automobiles and wear-resistant rubber sheets for machinery.
Environmental protection and special-purpose products
Food-grade rubber (such as bottle cap gaskets, rubber hoses for transporting food) : As non-toxic and environmentally friendly, it meets hygiene standards.
Medical rubber products (such as medical gloves and catheters)
Chemically stable and do not release harmful substances.
Weather-resistant rubber
It is used for outdoor sealing strips and waterproof materials, and has good anti-aging performance.
Foam rubber and sponge products
Filled in foamed rubber, Aluminum hydroxide regulates the cell structure, enhances flame retardancy and mechanical strength, and is commonly found in flame-retardant and sound-insulating sponges for construction and shock-absorbing foams for automotive interiors.
Application Advantages
High cost performance
Aluminum hydroxide has both flame-retardant and filling functions, reducing the usage of other additives and lowering costs.
Strong performance compatibility
Aluminum hydroxide can be well compatible with natural rubber and synthetic rubber (such as styrene-butadiene rubber and chloroprene rubber), without affecting the vulcanization molding process.
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