ASTM D2350-90(2005)

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 the standard. The values given in parentheses are for information only.
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-Dec-2004
• 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(1999) - Standard Test Method for Antimony Oxide in White Pigment Separated From Solvent-Reducible Paints
• Effective Date: 01-Jan-2005
• Replaced By: ASTM D2350-90(2010) - 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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(Reapproved2005)
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 3.3 Sb O from ousconditionissubtractedfromtotalSb O
2 3 2 3
and residual Sb O is calculated to Sb O .
1.1 This test method covers the determination of the total 2 3 2 5
3.4 The procedure is also described for antimony oxide in
antimony oxide in white pigment separated from solvent-
presence of large amounts of iron.
reducible paints.
1.2 The values stated in SI units are to be regarded as the
4. Significance and Use
standard. The values given in parentheses are for information
4.1 Antimony trioxide is often used in fire-retardant paints,
only.
so it is useful to formulators and users to be able to monitor the
1.3 This standard does not purport to address all of the
amount of this compound in whole paints.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Reagents
priate safety and health practices and determine the applica-
5.1 Purity of Reagents—Reagent grade chemicals shall be
bility of regulatory limitations prior to use.
used in all tests. Unless otherwise indicated, it is intended that
all reagents shall conform to the specifications of the Commit-
2. Referenced Documents
tee onAnalytical Reagents of theAmerican Chemical Society,
2.1 ASTM Standards:
where such specifications are available. Other grades may be
D1193 Specification for Reagent Water
used, provided it is first ascertained that the reagent is of
D2371 Test Method for Pigment Content of Solvent-
sufficiently high purity to permit its use without lessening the
Reducible Paints
accuracy of the determination.
3. Summary of Test Method 5.2 Purity of Water—Unless otherwise indicated, references
to water shall be understood to mean Type II reagent grade
3.1 The pigment is dissolved in hydrochloric acid (HCl).
water in accordance with Specification D1193.
Sulfuric acid (H SO ) is added. The mixture is titrated with
2 4
5.3 Hydrochloric Acid (sp gr 1.19)—Concentrated HCl.
potassium permanganate (KMnO ) and calculated to antimony
5.4 Hydrogen Sulfide (H S).
oxide (Sb O ) which gives antimony in the ous condition.
2 3
5.5 Potassium Permanganate, Standard Solution (0.1 N)—
3.2 The pigment is dissolved in H SO with potassium
2 4
Dissolve 3.2 g of pure potassium permanganate (KMnO)in1
sulfate(K SO )andreduced.Sodiumsulfite(Na SO )isadded
2 4 2 3
L of water, let stand 8 to 14 days, and siphon off the clear
andsulfurdioxidegas(SO )isexpelled.Thesolutionisdiluted
solution (or filter through a glass filter). For use in determining
andHCladdedafterwhichthesolutionistitratedwithKMnO ,
antimony, the KMnO solution is best standardized as follows:
which gives total antimony calculated to Sb O .
2 3
To0.25gofpuremetallicantimonyina500-mLresistant-glass
Erlenmeyer flask, add 12 to 15 mL of H SO (sp gr 1.84) and
2 4
This test method is under the jurisdiction of ASTM Committee D01 on Paint
10 to 12 g of K SO . Heat until all the antimony is dissolved,
2 4
and Related Coatings, Materials, andApplications and is the direct responsibility of
cool,diluteto100mLwithwater,add1to2gofsodiumsulfite
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
(Na SO ), and boil until all the SO is expelled.This expulsion
Current edition approved Jan. 1, 2005. Published February 2005. Originally
2 3 2
approved in 1965. Last previous edition approved in 1999 as D2350 – 90 (1999).
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. DOI: 10.1520/D2350-90R05. 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 (2005)
is evident when no blue color is obtained with starch-iodate 7.2.1 Calculate total antimony to Sb O . Subtract the Sb O
2 3 2 3
paper (5.7). The volume will be reduced about one half
...