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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.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
C25 Test Methods for Chemical Analysis of Limestone, Quicklime, and Hydrated Lime
D280 Test Methods for Hygroscopic Moisture (and Other Matter Volatile Under the Test Conditions) in Pigments
D281 Test Method for Oil Absorption of Pigments by Spatula Rub-out
D718 Test Methods for Analysis of Aluminum Silicate Pigment
D1366 Practice for Reporting Particle Size Characteristics of Pigments
D3360 Test Method for Particle Size Distribution by Hydrometer of the Common White Extender Pigments
E97 Method of Test for Directional Reflectance Factor, 45-Deg 0-Deg, of Opaque Specimens by Broad-Band Filter Reflectometry
ICS Number Code 87.060.10 (Pigments and extenders)
UNSPSC Code 31211503(Pigment paints)