ASTM D50-90(2005) - 1.9.2005
 
Significance and Use

These test methods compile in one place, recommended procedures for analyzing inorganic colored pigments. These pigments are used extensively in paints, and for this reason their compositions are important to the formulators and user.

 
1. Scope

1.1 These test methods cover procedures for the chemical analysis of yellow, orange, red, and brown pigments containing iron and manganese. The test methods apply specifically to the following pigments: synthetic hydrated yellow iron oxide, yellow ocher, red and brown iron oxides, raw and burnt umber, raw and burnt sienna, and venetian red.

1.2 The analytical procedures appear in the following order:

ASTM
Method
Refer-
Dry PigmentsSections ences
Moisture and Other Volatile MatterD 280
Loss on Ignition
Coarse Particles D 185
Matter Soluble in WaterD 1208
Organic Coloring Matter
Iron Oxide and
Calcium Compounds (Reported as CaO) and
Sulfates Soluble in Hydrochloric Acid and
Lead Chromate (in Ochers)
Calcium Carbonate (in Venetian Red)C 25
Manganese (in Siennas and Umbers) and
Pigment Pastes in Oil
Pigment Content D 1208
Moisture and Other Volatile MatterD 1208
Nonvolatile Matter in Vehicle
Moisture by Distillation D 1208
Coarse Particles and Skins D 185
Consistency (Stormer) D 562

1.3 &solely-SI-units;

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

 
2. Referenced Documents

C25-24

Standard Test Methods for Chemical Analysis of Limestone, Quicklime, and Hydrated Lime

D185-07(2023)

Standard Test Methods for Coarse Particles in Pigments

D280-01(2023)

Standard Test Methods for Hygroscopic Moisture (and Other Matter Volatile Under the Test Conditions) in Pigments

D562-10(2023)

Standard Test Method for Consistency of Paints Measuring Krebs Unit (KU) Viscosity Using a Stormer-Type Viscometer

D1193-24

Standard Specification for Reagent Water

D1208-96(2019)

Standard Test Methods for Common Properties of Certain Pigments

E11-24

Standard Specification for Woven Wire Test Sieve Cloth and Test Sieves