ASTM D2350-90(2010)

Standard Test Method for Antimony Oxide in White Pigment Separated From Solvent-Reducible Paints

SIGNIFICANCE AND USE
Antimony trioxide is often used in fire-retardant paints, so it is useful to formulators and users to be able to monitor the amount of this compound in whole paints.
SCOPE
1.1 This test method covers the determination of the total antimony oxide in white pigment separated from solvent-reducible paints.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 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.

General Information

• Status: Historical
• Publication Date: 31-May-2010
• ICS: 87.060.10 - Pigments and extenders
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.21 - Chemical Analysis of Paints and Paint Materials

Relations

• Replaces: ASTM D2350-90(2005) - Standard Test Method for Antimony Oxide in White Pigment Separated From Solvent-Reducible Paints
• Effective Date: 01-Jun-2010

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D2350 − 90 (Reapproved2010)
Standard Test Method for
Antimony Oxide in White Pigment Separated From Solvent-
Reducible Paints
This standard is issued under the fixed designation D2350; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript 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 andHCladdedafterwhichthesolutionistitratedwithKMnO ,
which gives total antimony calculated to Sb O .
2 3
1.1 This test method covers the determination of the total
antimony oxide in white pigment separated from solvent- 3.3 Sb O from ousconditionissubtractedfromtotalSb O
2 3 2 3
reducible paints. and residual Sb O is calculated to Sb O .
2 3 2 5
1.2 The values stated in SI units are to be regarded as 3.4 The procedure is also described for antimony oxide in
standard. No other units of measurement are included in this presence of large amounts of iron.
standard.
4. Significance and Use
1.3 This standard does not purport to address all of the
4.1 Antimony trioxide is often used in fire-retardant paints,
safety concerns, if any, associated with its use. It is the
so it is useful to formulators and users to be able to monitor the
responsibility of the user of this standard to establish appro-
amount of this compound in whole paints.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5. Reagents
2. Referenced Documents
5.1 Purity of Reagents—Reagent grade chemicals shall be
used in all tests. Unless otherwise indicated, it is intended that
2.1 ASTM Standards:
all reagents shall conform to the specifications of the Commit-
D1193 Specification for Reagent Water
tee onAnalytical Reagents of theAmerican Chemical Society,
D2371 Test Method for Pigment Content of Solvent-
where such specifications are available. Other grades may be
Reducible Paints
used, provided it is first ascertained that the reagent is of
sufficiently high purity to permit its use without lessening the
3. Summary of Test Method
accuracy of the determination.
3.1 The pigment is dissolved in hydrochloric acid (HCl).
5.2 Purity of Water—Unless otherwise indicated, references
Sulfuric acid (H SO ) is added. The mixture is titrated with
2 4
to water shall be understood to mean Type II reagent grade
potassium permanganate (KMnO ) and calculated to antimony
water in accordance with Specification D1193.
oxide (Sb O ) which gives antimony in the ous condition.
2 3
5.3 Hydrochloric Acid (sp gr 1.19)—Concentrated HCl.
3.2 The pigment is dissolved in H SO with potassium
2 4
sulfate(K SO )andreduced.Sodiumsulfite(Na SO )isadded
2 4 2 3
5.4 Hydrogen Sulfide (H S).
andsulfurdioxidegas(SO )isexpelled.Thesolutionisdiluted
5.5 Potassium Permanganate, Standard Solution (0.1 N)—
Dissolve 3.2 g of pure potassium permanganate (KMnO)in1
1 L of water, let stand 8 to 14 days, and siphon off the clear
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of solution (or filter through a glass filter). For use in determining
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
antimony, the KMnO solution is best standardized as follows:
Current edition approved June 1, 2010. Published June 2010. Originally
To0.25gofpuremetallicantimonyina500-mLresistant-glass
approved in 1965. Last previous edition approved in 2005 as D2350 – 90 (2005).
Erlenmeyer flask, add 12 to 15 mL of H SO (sp gr 1.84) and
DOI: 10.1520/D2350-90R10.
2 4
This standard has been approved for use by agencies of the Department of
Defense to replace Method 7016 of Federal Test Method Standard No. 141. Consult
the DoD Index of Specifications and Standards for the specific year of issue which Reagent Chemicals, American Chemical Society Specifications, American
has been approved by the Department of Defense. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
For referenced ASTM standards, visit the ASTM website, www.astm.org, or listed by the American Chemical Society, see Analar Standards for Laboratory
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Standards volume information, refer to the standard’s Document Summary page on and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
the ASTM website. MD.
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D2350 − 90 (2010)
10 to 12 g of K SO . Heat until all the antimony is dissolved, with water, add 20 mLof HCl (sp gr 1.19), and titrate to a faint
2 4
cool,diluteto100mLwithwater,add1to2gofsodiumsulfite pink tint with 0.1 N KMnO solution (Note 1).
(Na SO ), and boil until all the SO is expelled.This expulsion 7.2.1 Calculate total antimony to Sb O . Subtract the Sb O
2 3 2 2 3 2 3
is evident when no blue color is obtained with starch-iodate found using the procedure given
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