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

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.
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:ASTMMethodRefer-Dry PigmentsSections encesMoisture and Other Volatile MatterD 280Loss on IgnitionCoarse Particles D 185Matter Soluble in WaterD 1208Organic Coloring MatterIron Oxide and Calcium Compounds (Reported as CaO) and Sulfates Soluble in Hydrochloric Acid and Lead Chromate (in Ochers)Calcium Carbonate (in Venetian Red)C 25Manganese (in Siennas and Umbers) and Pigment Pastes in OilPigment Content D 1208Moisture and Other Volatile MatterD 1208Nonvolatile Matter in VehicleMoisture by Distillation D 1208Coarse Particles and Skins D 185Consistency (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.

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Publication Date
31-Aug-2005
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ASTM D50-90(2005) - Standard Test Methods for Chemical Analysis of Yellow, Orange, Red, and Brown Pigments Containing Iron and Manganese
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D50–90(Reapproved2005)
Standard Test Methods for
Chemical Analysis of Yellow, Orange, Red, and Brown
1
Pigments Containing Iron and Manganese
ThisstandardisissuedunderthefixeddesignationD50;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 These test methods cover procedures for the chemical
responsibility of the user of this standard to establish appro-
analysisofyellow,orange,red,andbrownpigmentscontaining
priate safety and health practices and determine the applica-
iron and manganese. The test methods apply specifically to the
bility of regulatory limitations prior to use.
following pigments: synthetic hydrated yellow iron oxide,
yellow ocher, red and brown iron oxides, raw and burnt umber,
2. Referenced Documents
raw and burnt sienna, and venetian red.
2
2.1 ASTM Standards:
1.2 The analytical procedures appear in the following order:
C25 Test Methods for Chemical Analysis of Limestone,
ASTM
Quicklime, and Hydrated Lime
Method
Refer-
D185 Test Methods for Coarse Particles in Pigments
Dry Pigments Sections ences
D280 Test Methods for Hygroscopic Moisture (and Other
Matter Volatile Under the Test Conditions) in Pigments
Moisture and Other Volatile Matter 6 D280
Loss on Ignition 7
D562 Test Method for Consistency of Paints Measuring
Coarse Particles 8 D185
Krebs Unit (KU)Viscosity Using a Stormer-TypeViscom-
Matter Soluble in Water 9 D1208
eter
Organic Coloring Matter 10
Iron Oxide 11 and 12
D1193 Specification for Reagent Water
Calcium Compounds (Reported as CaO) 13 and 14
D1208 Test Methods for Common Properties of Certain
Sulfates Soluble in Hydrochloric Acid 15 and 16
Pigments
Lead Chromate (in Ochers) 17
Calcium Carbonate (in Venetian Red) 18 C25
E11 SpecificationforWovenWireTestSieveClothandTest
Manganese (in Siennas and Umbers) 19 and 20
Sieves
Pigment Pastes in Oil
3. Significance and Use
Pigment Content 21 D1208
3.1 These test methods compile in one place, recommended
Moisture and Other Volatile Matter 22 D1208
procedures for analyzing inorganic colored pigments. These
Nonvolatile Matter in Vehicle 23
Moisture by Distillation 24 D1208
pigments are used extensively in paints, and for this reason
Coarse Particles and Skins 25 D185
their compositions are important to the formulators and user.
Consistency (Stormer) 26 D562
1.3 The values stated in SI units are to be regarded as 4. Preparation of Sample
standard. No other units of measurement are included in this
4.1 Mix the sample thoroughly and take a representative
standard.
portion for analysis. Reduce any lumps or coarse particles to a
fine powder by grinding. Grind extracted pigments to pass a
No. 80 (180-µm) sieve (see Specification E11 for detailed
1
These test methods are under the jurisdiction of ASTM Committee D01 on
Paint and Related Coatings, Materials, and Applications and are the direct
2
responsibility of Subcommittee D01.31 on Pigment Specification. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Sept. 1, 2005. Published September 2005. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approvedin1917.Lastpreviouseditionapprovedin1999asD50 – 90 (1999).DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D0050-90R05. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

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D50–90 (2005)
requirements). Discard any skins that do not pass through the with 25 mL of 1 N alcoholic sodium hydroxide (NaOH)
sieve. Mix the finely ground pigment thoroughly. solution and again decant. Boil another 2-g portion of the
sample with 25 mL of chloroform, let settle, and decant the
5. Purity of Reagents
supernatant liquid. If any one of the above solutions is colored,
5.1 Purity of Reagents—Unless otherwise indicated, it is
organic coloring matter is indicated (Note 2). If the solutions
intended that all reagents shall conform to the specifications of
remain colorless, organic colors are probably absent, but may
theCommitteeonAnalyticalReagentsoftheAmericanChemi-
be tested for by reference to procedures given in standard
3
cal Society, where such specifications are available. Other
reference works, taking into account the nature of the pigment
4
grades may be used, provided it is first ascertained
...

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