Practical Parameters Affecting Opacity

摘要

While the search for alternatives to lead-chromate pigmentation systems began in the 1970s,lead-free pigments remained the exception for many years.There are several reasons for this,the most prevalent being the technical and physical differences in the two pigment classes (Table 1),and subsequent difficulties in their processing and application.In many areas the potential of lead-chromate-containing pigments has been largely exhausted.