ASTM D2350-90(1999)

Standard Test Method for Antimony Oxide in White Pigment Separated From Solvent-Reducible 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 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: 09-May-1999
• 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

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

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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(Reapproved 1999)
Standard Test Method for
Antimony Oxide in White Pigment Separated From Solvent-
Reducible Paints
This standard is issued under the fixed designation D 2350; 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 (e) indicates an editorial change since the last revision or reapproval.
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 has been approved by
the Department of Defense.
1. Scope 4. Significance and Use
1.1 This test method covers the determination of the total 4.1 Antimony trioxide is often used in fire-retardant paints,
antimony oxide in white pigment separated from solvent- so it is useful to formulators and users to be able to monitor the
reducible paints. amount of this compound in whole paints.
1.2 This standard does not purport to address all of the
5. Reagents
safety concerns, if any, associated with its use. It is the
5.1 Purity of Reagents—Reagent grade chemicals shall be
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- used in all tests. Unless otherwise indicated, it is intended that
all reagents shall conform to the specifications of the Commit-
bility of regulatory limitations prior to use.
tee onAnalytical Reagents of theAmerican Chemical Society,
2. Referenced Documents
where such specifications are available. Other grades may be
2.1 ASTM Standards: used, provided it is first ascertained that the reagent is of
D 1193 Specification for Reagent Water sufficiently high purity to permit its use without lessening the
D 2371 Test Method for Pigment Content of Solvent- accuracy of the determination.
Reducible Paints 5.2 Purity of Water—Unless otherwise indicated, references
to water shall be understood to mean Type II reagent grade
3. Summary of Test Method
water conforming to Specification D 1193.
3.1 The pigment is dissolved in hydrochloric acid (HCl). 5.3 Hydrochloric Acid (sp gr 1.19)—Concentrated HCl.
Sulfuric acid (H SO ) is added. The mixture is titrated with
5.4 Hydrogen Sulfide (H S).
2 4 2
potassium permanganate (KMnO ) and calculated to antimony 5.5 Potassium Permanganate, Standard Solution (0.1 N)—
oxide (Sb O ) which gives antimony in the ous condition.
Dissolve 3.2 g of pure potassium permanganate (KMnO )in1
2 3 4
3.2 The pigment is dissolved in H SO with potassium L of water, let stand 8 to 14 days, and siphon off the clear
2 4
sulfate(K SO )andreduced.Sodiumsulfite(Na SO )isadded
solution (or filter through a glass filter). For use in determining
2 4 2 3
andsulfurdioxidegas(SO )isexpelled.Thesolutionisdiluted antimony, the KMnO solution is best standardized as follows:
andHCladdedafterwhichthesolutionistitratedwithKMnO ,
To0.25gofpuremetallicantimonyina500-mLresistant-glass
which gives total antimony calculated to Sb O . Erlenmeyer flask, add 12 to 15 mL of H SO (sp gr 1.84) and
2 3
2 4
3.3 Sb O from ousconditionissubtractedfromtotalSb O
10 to 12 g of K SO . Heat until all the antimony is dissolved,
2 3 2 3 2 4
and residual Sb O is calculated to Sb O . cool,diluteto100mLwithwater,add1to2gofsodiumsulfite
2 3 2 5
3.4 The procedure is also described for antimony oxide in
(Na SO ), and boil until all the SO is expelled.This expulsion
2 3 2
presence of large amounts of iron. is evident when no blue color is obtained with starch-iodate
paper (5.7). The volume will be reduced about one half. Dilute
This test method is under the jurisdiction of ASTM Committee D-1 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of Reagent Chemicals, American Chemical Society Specifications, American
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
Current edition approved May 25, 1990. Published July 1990. Originally listed by the American Chemical Society, see Analar Standards for Laboratory
published as D 2350 – 65 T. Last previous edition D 2350 – 85. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Annual Book of ASTM Standards, Vol 11.01. and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
Annual Book of ASTM Standards, Vol 06.01. MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D2350
to250mLwithwater,add20mLofHCl(spgr1.19)andtitrate 7.2.1 Calculate total antimony to Sb O . Subtract
...