ASTM D2746-07
(Test Method)Standard Test Method for Staining Tendency of Asphalt (Stain Index)
Standard Test Method for Staining Tendency of Asphalt (Stain Index)
SIGNIFICANCE AND USE
This test method measures the tendency for oil components to separate spontaneously from asphalt. The separation of oil components can cause staining in asphalt roofing products and adjacent materials in storage and use.
The stain index is related to the thermal stability of the asphalt. Higher stain index values indicate lower stability and greater tendency for staining.
Use this procedure to determine the staining tendency of asphalt and to compare the results against a material for which the staining tendency is known.
SCOPE
1.1 This test method covers the determination of the staining tendency of asphalt and the assignment of a stain index proportional to the extent of staining observed.
1.2 This test method is applicable to asphalts having ring-and-ball softening points of 85°C (185°F) or greater.
Note 1—This test method may be modified for use with other bituminous materials with softening points less than 85°C (185°F) by using a different temperature than specified in Section 7 by agreement of the interested parties. The report of results from such a test may cite this method but must clearly state the temperature employed in the exception and acknowledge that the interpretation of results in Section 9 and the precision and bias stated in Section 10 may not apply.
1.3 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
1.4 This standard does not purport to address 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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Designation: D2746 − 07
StandardTest Method for
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Staining Tendency of Asphalt (Stain Index)
This standard is issued under the fixed designation D2746; 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 diameter of the brass ring to determine the staining character-
istic of the asphalt. The stain index is the difference between
1.1 This test method covers the determination of the stain-
the diameter of the stained circle and the initial disc diameter
ing tendency of asphalt and the assignment of a stain index
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measured to the nearest 0.5 mm ( ⁄64 in.).
proportional to the extent of staining observed.
1.2 This test method is applicable to asphalts having ring-
4. Significance and Use
and-ball softening points of 85°C (185°F) or greater.
4.1 This test method measures the tendency for oil compo-
NOTE 1—This test method may be modified for use with other
nentstoseparatespontaneouslyfromasphalt.Theseparationof
bituminous materials with softening points less than 85°C (185°F) by
oil components can cause staining in asphalt roofing products
using a different temperature than specified in Section 7 by agreement of
and adjacent materials in storage and use.
the interested parties. The report of results from such a test may cite this
method but must clearly state the temperature employed in the exception
4.2 The stain index is related to the thermal stability of the
and acknowledge that the interpretation of results in Section 9 and the
asphalt. Higher stain index values indicate lower stability and
precision and bias stated in Section 10 may not apply.
greater tendency for staining.
1.3 The values stated in SI units are to be regarded as the
4.3 Usethisproceduretodeterminethestainingtendencyof
standard. The values in parentheses are for information only.
asphalt and to compare the results against a material for which
1.4 This standard does not purport to address the safety
the staining tendency is known.
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
5. Apparatus
health practices and determine the applicability of regulatory
5.1 Rings—Square shouldered brass retaining rings con-
limitations prior to use.
forming to the dimensions required for use in the ring-and-ball
softening point apparatus (see Fig. 1 (a) of Test Method D36).
2. Referenced Documents
5.1.1 The inside diameter of the ring to be placed in contact
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2.1 ASTM Standards:
40
with the filter paper during the test is 16 mm ( ⁄ in.).
D36TestMethodforSofteningPointofBitumen(Ring-and-
NOTE 2—This test method depends on accurate measurement of
Ball Apparatus)
diameter and precise alignment of the face and rim of the ring on a flat
D140Practice for Sampling Bituminous Materials
surface. Therefore, deformed rings must not be used.
E2251Specification for Liquid-in-Glass ASTM Thermom-
5.2 Pouring Plate—A flat, smooth, brass plate approxi-
eters with Low-Hazard Precision Liquids
mately 50 by 75 mm (2 by 3 in.).
3. Summary of Test Method
5.3 Paper—Filter paper of the standard double acid-washed
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3.1 A horizontal disc of asphalt, cast in a brass retaining
analytical grade.
ring,isplacedonasheetoffilterpapersupportedonaflatplate
5.3.1 The filter paper must be of sufficient area to accom-
and heated at 80°C (175°F) for 120 h. The diameter of the
modate the number of samples and the known material
resulting stained circle on the paper is compared to the inside
arranged as described in 7.3.
5.4 Support Plate—A flat, clean, smooth metal plate ap-
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ThistestmethodisunderthejurisdictionofASTMCommitteeD08onRoofing proximately1.5mm( ⁄16in.)thickandareaatleastsufficientto
and Waterproofing and is the direct responsibility of Subcommittee D08.02 on
support the size of filter paper being used.
Prepared Roofings, Shingles and Siding Materials.
Current edition approved May 1, 2007. Published May 2007. Originally
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approved in 1991. Last previous edition approved in 2002 as D2746–97 (2002) .
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DOI: 10.1520/D2746-07. The sole source of supply of the paper known to the committee at this time is
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or Whatman No. 40 filter paper, available from laboratory supply and service
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM companies.Ifyouareawareofalternativesuppliers,pleaseprovidethisinformation
Standards volume information, refer to the standard’s Document Summary page on to ASTM International Headquarters. Your comments will receive careful consid-
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the ASTM website. erationatameetingoftheresponsibl
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