D50 (version 90(2023))
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.