Techniques for experimental development of a typical medium-quality interior latex flat wall paint are discussed, including formula design, compounding and testing. Emphasis is on determination of the best combination of non-structured and/or structured extender pigments. Non-structured pigments are represented by ground calcium carbonate and crystalline silica, structured pigments by calcined clay and diatomite.
Statistics on production and consumption of calcium carbonate and calcined clay pigments are presented in Table 1; this information is considerably dated, but it provides a general overview of the quantities involved.