ASTM D50 : 90(2023)

Standard Test Methods for Chemical Analysis of Yellow, Orange, Red, and Brown Pigments Containing Iron and Manganese

Standard Details

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 StandardDetails, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.