3.1 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.

1.1 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 Pigments
 

Sections

ences

Moisture and Other Volatile Matter

 6

 D280

Loss on Ignition

 7

Coarse Particles

 8

 D185

Matter Soluble in Water

 9

 D1208

Organic Coloring Matter

10

Iron Oxide

11 and 12

Calcium Compounds (Reported as CaO)

13 and 14

Sulfates Soluble in Hydrochloric Acid

15 and 16

Lead Chromate (in Ochers)

17

Calcium Carbonate (in Venetian Red)

18

 C25

Manganese (in Siennas and Umbers)

19 and 20

Pigment Pastes in Oil

Pigment Content

21

 D1208

Moisture and Other Volatile Matter

22

 D1208

Nonvolatile Matter in Vehicle

23

Moisture by Distillation

24

 D1208

Coarse Particles and Skins

25

 D185

Consistency (Stormer)

26

 D562

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

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, health, and environmental practices and determine the applicability of regulatory limitations prior to us.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.