Platelet Alumina is a high quality alumina type abrasive powder, consisting of a plate-shaped crystal of Al2O3 with a purity of over 99.0%. It has excellent heat resistant properties as well as being chemically inert, and is not corroded by either acids or alkalines. As the particle size distribution of Platelet Alumina is tightly controlled, it can produce a very fine lapped surface, giving it superlative effectiveness as an abrasive. With a tremendous range of utilizations, Platelet Alumina is an abrasive powder capable of performing a myriad of functions.
Chemical composition
| Chemical | Guarantee Value | Typical Value |
| Al2O3 | ≥99.0% | 99.36% |
| SiO2 | ＜0.2% | 0.017% |
| Fe2O3 | ＜0.1% | 0.03% |
| Na2O | ＜0.6% | 0.35% |
Physical properties
| Material | α-Al2O3 |
| Color | White |
| Specific gravity | ≥3.9g/cm3 |
| Mohs’Hardness | 9.0 |
Available Sizes
| Type | D3(um) | D50（um） | D94（um） |
| CA45 | 50.5-56.2 | 33-38.5 | 20.7-24.5 |
| CA40 | 39-44.6 | 27.7-31.7 | 18-20 |
| CA35 | 35.4-39.8 | 23.8-27.2 | 15-17 |
| CA30 | 28.1-32.3 | 19.2-22.3 | 13.4-15.6 |
| CA25 | 24.4-28.2 | 16.1-18.7 | 9.6-11.2 |
| CA20 | 20.9-24.1 | 13.1-15.3 | 8.2-9.8 |
| CA15 | 14.8-17.2 | 9.4-11 | 5.8-6.8 |
| CA12 | 11.8-13.8 | 7.6-8.8 | 4.5-5.3 |
| CA09 | 8.9-10.5 | 5.9-6.9 | 3.3-3.9 |
| CA05 | 6.6-7.8 | 4.3-5.1 | 2.55-3.05 |
| CA03 | 4.8-5.6 | 2.8-3.4 | 1.5-2.1 |
Product applications
1) Electronics industry: grinding and polishing of semiconductor monocrystalline silicon wafers, quartz quartz crystals, compound semiconductors (crystalline gallium, phosphating nano).
2) Glass industry: grinding and processing of crystal, quartz glass, kinescope glass shell screen, optical glass, liquid crystal display (LCD) glass substrate, and quartz crystal.
3) Coating industry: special coatings and fillers for plasma spraying.
4) Metal and ceramic processing industry: precision ceramic materials, sintered ceramic raw materials, high-grade high-temperature coatings, etc.