How to Use CMC to Deal with Pinholes on Ceramic Glaze

Sodium Carboxymethyl Cellulose (CMC for short) for ceramic glaze is white or light yellow powder, granular or fibrous solid, odorless, non-toxic, water-soluble. CMC is selected as the electrolyte in the production of sanitary ceramics because it has good adhesion, suspension, decondensation and water retention effect, so that it can be widely used in ceramic glaze.

In the actual production process of ceramic glaze (wall and floor tiles, ceramic tiles, etc.), pinholes which similar to needle-like holes often appear on the glaze. There are many reasons for this phenomenon. For example, the frit is not fully melted; the difference between the initial melting temperature and the highest temperature of the glaze is too large; the temperature of the ceramic body is too high during glazing, which causes the body to be too dry, which makes the speed of the glaze infiltrating the body too fast and so on.

There are many commonly used solutions, such as appropriately increasing the initial melting temperature of the glaze, reducing the high peak temperature, improving the quality of the frit, appropriately reducing the firing temperature or increasing the maturity temperature range of the glaze, etc. But the best way is to improve the water retention performance of the glaze to prevent over-drying and lack of water, which requires adding raw materials with better water retention. Ceramic grade sodium carboxymethyl cellulose( is a raw material with good water retention and can provide good adhesion. The detail specifications can be customized according to customers’ requirement. For common specifications, please refer to the specification sheet of ceramic grade sodium carboxymethyl cellulose. There are also instant and granular products for selection.

If you would like to get more information about CMC used in ceramic industry, please feel free to contact us. We will try our best to give you professional advice.



Share on facebook
Share on twitter
Share on linkedin

Contact Us