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ASTM D1844-86(2020)

(Test Method)

Standard Test Methods for Chemical Analysis of Basic Lead Silicochromate

Standard Test Methods for Chemical Analysis of Basic Lead Silicochromate

SIGNIFICANCE AND USE
3.1 These test methods may be used to confirm the stated lead oxide, chromium trioxide and silica content of basic lead silicochromate and is useful for quality control.
SCOPE
1.1 These test methods cover the chemical analysis of the pigment commercially known as basic lead silicochromate and are applicable to pigment supplied by the manufacturer and to pigment, but not mixed pigments, separated from liquid coatings. The presence of basic lead silicochromate species shall be confirmed by X-ray diffraction analysis (see Specification D1648).  
1.2 For liquid coatings the pigment must first be separated from the vehicle before conducting the analysis.  
1.3 The analytical procedures appear in the following order:    
Sections    
Lead oxide  
6 to 14  
Chromium trioxide  
15 to 23  
Silica  
24 to 27  
Moisture and other volatile matter  
28  
Coarse particles  
29  
Oil absorption  
30  
Mass color and tinting strength  
31  
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.5 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 use.  
1.6 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.

General Information

Status
Published
Publication Date
31-May-2020
ICS
87.060.10 - Pigments and extenders
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.31 - Pigment Specifications
Current Stage
Ref Project

Relations

Refers
ASTM D1648-86(2020) - Standard Specification for Basic Lead Silicochromate Pigment
Effective Date
01-Jun-2020

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ASTM D1844-86(2020) - Standard Test Methods for Chemical Analysis of Basic Lead SilicochromateASTM D1844-86(2020) - Standard Test Methods for Chemical Analysis of Basic Lead Silicochromate
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ASTM D1844-86(2020) - Standard Test Methods for Chemical Analysis of Basic Lead Silicochromate
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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.
Designation: D1844 − 86 (Reapproved 2020)
Standard Test Methods for
1
Chemical Analysis of Basic Lead Silicochromate
This standard is issued under the fixed designation D1844; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
2
1.1 These test methods cover the chemical analysis of the 2.1 ASTM Standards:
D185Test Methods for Coarse Particles in Pigments
pigment commercially known as basic lead silicochromate and
are applicable to pigment supplied by the manufacturer and to D280Test Methods for Hygroscopic Moisture (and Other
Matter Volatile Under the Test Conditions) in Pigments
pigment, but not mixed pigments, separated from liquid
D281Test Method for Oil Absorption of Pigments by
coatings. The presence of basic lead silicochromate species
Spatula Rub-out
shall be confirmed by X-ray diffraction analysis (see Specifi-
D387Test Method for Color and Strength of Chromatic
cation D1648).
Pigments with a Mechanical Muller
1.2 For liquid coatings the pigment must first be separated
D1193Specification for Reagent Water
from the vehicle before conducting the analysis.
D1648SpecificationforBasicLeadSilicochromatePigment
1.3 Theanalyticalproceduresappearinthefollowingorder:
D2371 Test Method for Pigment Content of Solvent-
Sections
Reducible Paints
Lead oxide 6 to 14
Chromium trioxide 15 to 23
3. Significance and Use
Silica 24 to 27
3.1 These test methods may be used to confirm the stated
Moisture and other volatile matter 28
Coarse particles 29
lead oxide, chromium trioxide and silica content of basic lead
Oil absorption 30
silicochromate and is useful for quality control.
Mass color and tinting strength 31
4. Purity of Reagents
1.4 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
4.1 Reagent grade chemicals shall be used in all tests.
only.
Unlessotherwiseindicated,itisintendedthatallreagentsshall
1.5 This standard does not purport to address all of the conform to the specifications of the Committee on Analytical
Reagents of the American Chemical Society, where such
safety concerns, if any, associated with its use. It is the
3
responsibility of the user of this standard to establish appro- specifications are available. Other grades may be used, pro-
vided it is first ascertained that the reagent is of sufficiently
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use. high purity to permit its use without lessening the accuracy of
the determination.
1.6 This international standard was developed in accor-
dance with internationally recognized principles on standard-
4.2 Unless otherwise indicated, references to water shall be
ization established in the Decision on Principles for the
understood to mean reagent water conforming to Type II of
Development of International Standards, Guides and Recom-
Specification D1193.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee. 2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
1 3
These test methods are under the jurisdiction of ASTM Committee D01 on ACS Reagent Chemicals, Specifications and Procedures for Reagents and
Paint and Related Coatings, Materials, and Applications and are the direct
Standard-Grade Reference Materials, American Chemical Society, Washington,
responsibility of Subcommittee D01.31 on Pigment Specifications.
DC. For suggestions on the testing of reagents not listed by theAmerican Chemical
Current edition approved June 1, 2020. Published June 2020. Originally
Society, see Analar Standards for Laboratory Chemicals, BDH Ltd., Poole, Dorset,
approved in 1961. Last previous edition approved in 2014 as D1844–86(2014). U.K., and the United States Pharmacopeia and National Formulary, U.S. Pharma-
DOI: 10.1520/D1844-86R20. copeial Convention, Inc. (USPC), Rockville, MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D1844 − 86 (2020)
5. Preparation of Sample (1+1). Destroy the organic material by evaporating the
solution to dense white fumes, making further additions of
5.1 Thoroughly mix
...

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