There are several different kinds of sulphuric anodising treatment, which are determined by the field of application. Some are used in decorative and architectural pieces, readying a piece for dying, if necessary, as well as preparing it for Hard Anodising.
The process is occasionally referred to as natural, silver or clear anodising and is the most common type of anodising process.
Sulphuric anodising for protection can be used to produce a film thickness of between three and 30 microns. The thinnest of these layers simply coats the aluminium and prevents it blackening the hands of those who handle it. The thickest offers excellent electrical insulation and corrosion protection while helping to minimise the loss of fatigue strength, which can occur on other, non-sulphuric or chromic treatments.