Oxide Polishing Laps
Manufacturer: Ultra Tec
Availability: Ships from Supplier, 1-2 week average lead time.
Ultra-laps are thin Mylar discs coated with an oxide polishing medium. In use, they are set onto a blank Master Lap (and can also be used on the previously used pre-polish Lap).
The main virtue of Ultra-laps is that they are fast – immediately ready-to-use, eliminating the need to prepare a slurry, and eliminating the mess that comes with slurry polishing. Ultra-laps do tend to leave a small rounding of the facet meets – imperceptible on jewelry mounted stones but perceptible under magnification on competition stones.
The Ultra-laps is held to its support Lap by a film of water – in mounting the Ultra-laps, it is placed, shiny side down, onto a water-wet surface and air bubbles are finger-pressed to the perimeter – and out (wetting the top surface of the ULTRALAP allows you to to do that easily). The wet sub-film of water holds down the Ultra-laps. During polishing, a water drip is used.
Ultra-laps are available in packages of ten.
The available oxide polishing media are Alumina, Chrome, and the most popular, Spectra, (which is particularly good for polishing Quartz). Spectra is a special milling of Cerium Oxide, coded blue (consequently, often called “Blue Spectra).