This specification covers two types of high-content calcium carbonate pigments, Type PC and Type GC. Pigments shall be classified into six grades based on particle size, namely: Grade I (fine paint grade); Grade II (coarse paint grade); Grade III (filler grade); Grade IV (putty powder grade); Grade V (superfine grade); and Grade VI (ultrafine grade). Tests shall be conducted in accordance with the following test methods: calcium and magnesium reported as carbonate; moisture and other volatile matter; oil absorption; coarse particles; and dispersed color.

1.1 This specification covers two types of high-content calcium carbonate pigments, as follows:

1.1.1 Type PC—Calcium carbonate precipitate, prepared either by complete solution or by carbonation of lime.

1.1.2 Type GC—Ground mineral product.

1.2 Six grades of pigments, based on particle size (see 3.3) are covered.

1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.