 for thermal conductivity_1794206252785.webp)
Al2O3 (α phase) for thermal conductivity
2. Specific surface area: 6–10 m²/g
3. Crystal form: α-phase
4. Particle size: 500 nm / 1–5 um
5. Product application: Thermal conductivity enhancement in plastics and rubber
- Product Description
Al2O3 (α Phase) for Thermal Conductivity: High-Purity Alumina Powder for Plastics and Rubber Compounds
The choice of filler frequently marks the beginning of thermal management in plastics and rubber. Xi’an PUTAI supplies Al2O3 (α phase) for thermal conductivity as a high purity alumina powder for plastics and rubber for thermal conductivity. It is available in 500 nm, 1-5 um diameters. The grade is 99.99% pure with specific surface area of 6-10 m 2 /g. The α crystal form is the most thermodynamically stable form of alumina and hence the candidate filler for polymer composites transmitting heat. Small experiments in your own formulation will show you which grade is good for your procedure.
Al2O3 (α phase) for Thermal Conductivity Specifications
| Item | Specification |
|---|---|
| Product | Al2O3 (α-phase) powder |
| Purity | 99.99% |
| Crystal form | α-phase |
| Specific surface area | 6–10 m²/g |
| Particle size | 500 nm / 1–5 um |
| Hardness | Mohs 9 (α-phase) |
| Application | Thermal conductivity improvement in plastics and rubber |
| Model | Appearance | Crystalline | Partical size (nm) | Purity (%) | Specific area (m2/g) | Application |
YW-104R | white powder | a phase | 500nm | 99.99 | 6-10 | Plastic and rubber thermal conductivity |
YW-L600D | white powder | γ phase | 1-5um | 99.8 | 6-10 | Plastic and rubber thermal conductivity |
Values such as thermal conductivity, volume resistivity, bulk density, moisture content and impurity breakdown are not provided in the source specifications, so they are not listed here. If you need any of them, ask us before you finalize your selection.
Why α-Phase Alumina Is Used for Heat Conduction?
The α phase is the most thermodynamically stable crystalline form of alumina and has the maximum thermal conductivity among the alumina phases. In polymers and rubber, Al2O3 (α phase) is used as a filler for thermal conductivity, to allow normal atoms to build heat channels through the polymer matrix while the material remains electrically insulating. This combination is important in electrical parts when you want to get heat out of the component without establishing a conductive route.
Specifications state 99.99% purity, a specific surface area of 6–10 m²/g and Mohs 9 hardness. This site does not include any loading-performance statistics, therefore validate findings in your own formulation.
Choosing Between 500 nm and 1–5 um Grades
The choice of Al2O3 (α phase) for thermal conductivity is a start with three trade-offs: thermal conductivity, processing viscosity and equipment wear. Every particle size upsets that equilibrium, and the grade should be determined by your individual priorities.
- 500 nm: the highest grade. Think about it for thin portions. See compound viscosity in your mixer.
- 1-2 µm: A compromise between the other two classes and a reasonable start for initial experiments.
- 1–5 μm: The coarsest grade. Look for mixer and screw wear in your line.
Before scaling up, do modest experiments using your own polymer and loading. Compare heat transfer, melt/mix viscosity and tool wear side-by-side
Dispersion and Storage Guidance
Fine alumina particles with high surface energy attract each other via Van der Waals interactions and may form clusters. Use a high shear mixer or bead mill where your process permits. Add a silane or surfactant that is suitable with your polymer system.
α-phase alumina is chemically stable but the powder may absorb moisture and wet powder may cake. Seal bags and keep dry. After lengthy storage test moisture before use by loss on ignition (LOI) test.
Applications in Plastics and Rubber
Our product may be used for these applications:
- Electronic packaging: A filler that conducts heat away from components while the material remains electrically insulating.
- LED cooling: Alumina filled polymers for LED housings and mounts.
- Thermal pads. Rubber pads filled for use as a heat transfer contact between a heated object and a heat sink.
- Wear-resistant parts: Mohs 9 hardness provides wear resistance in plastic and rubber parts. Test it out in your own tests.
α-Phase vs γ-Phase and Silica Fillers
Alumina occurs in more than one crystal phase. The γ-phase is usually selected for its high specific surface area and thickening efficiency. If hardness and thermal conductivity are the major aims then the alpha-phase is preferable but may be tougher to spread. This article describes just the α-phase grade.
Fumed silica is mostly utilised to thicken up a system. alpha-phase alumina is the more relevant choice when heat dissipation or scratch resistance is important.
Purchasing Considerations
For a quotation on Al2O3 (α phase) for thermal conductivity, please provide:
- Base polymer (plastic or rubber kind)
- Filler loading and thermal target target
- Method of processing and equipment
- Preferred particle size 500 nm, 1 to 5 um
About PUTAI
Xi'an Putai Environmental Protection Co., Ltd. (Putai Group) was founded in August 2008 and listed on the stock exchange in November 2016 with the stock number 839410. The company integrates R&D, manufacturing, sales and associated services, and has production bases of more than 30,000 m2 and 100,000 m2. It is also famous for coagulants and other water treatment chemicals in Northwest China.
FAQ
Q1: How large should the particle be?
A: Thermal conductivity Viscosity of the process and wear of equipment . Try out short experiments with your own polymer in the 500 nm or 1-5 um grade.
Q2: Why is the powder clumping? How can I stop this?
A: Van der Waals attraction due to high surface energy. Use high shear dispersion or bead milling and a silane or surfactant appropriate to your system.
Q3: Should I choose α-phase or γ-phase alumina?
A: If you care about thickening efficiency and specified surface area, employ γ-phase. For hardness and thermal conductivity, use the α-phase.
Q4: How to store the powder?
A: Seal and keep dry, moisture causes caking. Perform a LOI test after lengthy storage.
Contact Us
Do you have more questions about Al2O3 (α phase) for thermal conductivity? Email sales@ywputai.com with your polymer system, target loading and preferred particle size.
