Meller Optics optical polishing powders are offered in two grades

Microlux alumina optical polishing powders are ready to mix with de-ionized water, and are offered in two grades and seven particle sizes from 0.05 to 3.0 μm. Applied directly to optics on spot blocks, they can produce finishes to 10-5 scratch-dig on hard and soft materials, including zinc selenide (ZnSe), germanium, and silicon.
Meller Optics
Providence, RI
www.melleroptics.com