Frequently Asked Questions

We have a Chemical Compatibility Chart that you can use for reference.

Ceramic membranes have two noticeably different sides. One is bright white and very smooth, while the other is off-white and somewhat rougher. The off-white/tan side also will have text printed on it, which specified the lot number and pore size of the membrane.

Proper orientation of the ceramic membrane disc filters is critical to their performance. The disc should always be oriented so that the white smooth membrane surface is facing toward the feed.

There is no direct conversion between microns, a unit of length, and Daltons, a unit of molecular weight.  However, there is an approximate correlation between pore size rating and MWCO. However, the following chart can be consulted to know what MWCO might fit best based on the pore structure of the membranes.

The ceramic membrane filters are only available with microfiltration and ultrafiltration retention characteristics.  It is not within the capability of current technology to manufacture ceramic membranes with the salt rejection characteristics required for NF and RO applications.

The ceramic membrane disk filters are considerably thicker than conventional membrane disk filters and will not fit in conventional disk filter holders.  The ceramic membrane disk
filters must be used with the specially designed holders offered here.

The ceramic membrane filters are only available with 47mm and 90mm diameters. You may want to consider other inorganic membranes, such as alumina oxide or silver, for applications requiring different diameters.

Ceramic membranes are composed of a matrix of zirconium oxide and titanium dioxide. These rigid, inert inorganic filters have superior chemical and thermal resistance. They can be operated at temperatures that would destroy conventional polymer membranes, up to 350°C. These attributes are uniquely suited to applications where the filters are subjected to repeated regeneration with chemical and high temperature cleanings.