High-purity alumina, split by the purity tier the application actually requires. At 3N (99.9%) particle size and its distribution do most of the work and purity beyond three nines buys nothing; at 4N (99.99%) the remaining impurities are the specification — electronic materials and sapphire crystal growth reject lots on single-element counts a 3N COA does not even report. Specifying one tier above what the process needs is the most common way this material gets over-bought; tell us the application and we confirm the tier before quoting.
Grades
| SKU | Grade | Typical | Application |
|---|---|---|---|
| NTS-AL-3N | Alumina 3N | Purity 99.9%, particle size agreed per order | Ceramic components, polishing |
| NTS-AL-4N | Alumina 4N | Purity 99.99% | Electronic materials, sapphire feedstock |
NTS-AL-3N — alumina 3N
99.9% alumina with particle size agreed per order, for pressed and sintered ceramic parts and for polishing. Defined as much by particle size as purity, so the order starts from your target D50 and forming route, and the COA states the particle-size method alongside the values.
NTS-AL-4N — alumina 4N
99.99% alumina for electronic materials and as feedstock for sapphire crystal growth. Qualification is impurity-led: the elements your process is sensitive to, and the detection limits they must be reported at, are fixed in writing before the first lot ships.