Low-α Ray Alumina
High Purity Alumina Series Products
Low-α Ray Alumina
Low-α Ray High Purity Alumina / Low-α Ray Single Crystal Alumina
Low-α Ray Alumina is a high-performance ceramic powder material, with the core feature of having an extremely low level of α ray emission (i.e., extremely low content of radioactive elements such as uranium and thorium, usually below 5 ppb), while also possessing advantages such as single and complete crystal phase, adjustable particle size distribution, good thermal conductivity, strong insulation, and high filling rate.
Low-α Ray Alumina is mainly used in the high-end chip packaging process, added as a functional filler to epoxy molding compound, effectively avoiding the signal interference and faults caused by α rays to semiconductor components. It is widely applied in advanced packaging technologies such as high-bandwidth memory (HBM).
| Typical Properties | Units | 4N5G-L36 | 4N5G-L2 | 4N5A-L36 | 4N5A-L5 | D4-L2 |
|---|---|---|---|---|---|---|
Crystal Structure |
γ/Irregular |
γ/Irregular |
α/Irregular |
α/Irregular |
α/Single Crystal | |
Average Particle Size (by Bettersize Laser 9300SE) |
D50, um |
30-40 |
1-3 |
30-40 |
3-5 |
2.0-2.5 |
Loose Bulk Density |
g/cm3 |
0.55-0.65 |
0.30-0.40 |
0.70-0.80 |
0.65-0.75 |
0.70-0.80 |
BET Surface Area |
m2/g |
45-65 |
50-70 |
≤5 |
≤5 |
≤5 |
Purity (Al2O3) ≥ |
% |
99.995 |
99.995 |
99.995 |
99.995 |
99.99 |
Impurity ≤ (by ICP-OES) | ||||||
Na |
ppm |
10 |
10 |
10 |
10 |
10 |
Ca |
ppm |
1 |
1 |
1 |
1 |
1 |
Fe |
ppm |
1 |
1 |
1 |
1 |
1 |
Si |
ppm |
10 |
10 |
10 |
10 |
10 |
U |
ppb |
5 |
5 |
5 |
5 |
5 |
Th |
ppb |
5 |
5 |
5 |
5 |
5 |
Packing (As per customer’s requests) |
drum |
25kg |
25kg |
25kg |
25kg |
25kg |