ASTM D2746-97(2002)e1
(Test Method)Standard Test Method for Staining Tendency of Asphalt (Stain Index)
Standard Test Method for Staining Tendency of Asphalt (Stain Index)
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 185°F (85°C) or greater.
Note 1—This test method may be modified for use with other bituminous materials with softening points less than 185°F (85°C) 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 and the precision and bias stated in Section 10 may not apply.
1.3 The values stated in U.S. customary units are to be regarded as the standard.
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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e1
Designation:D2746–97 (Reapproved 2002)
Standard Test Method for
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 (e) indicates an editorial change since the last revision or reapproval.
e NOTE—Editorially switched from inch/pound dominant to SI dominant in April 2002.
1. Scope istic of the asphalt. The stain index is the difference between
the diameter of the stained circle and the initial disc diameter
1.1 This test method covers the determination of the stain-
measured to the nearest 0.5 mm ( ⁄64ths of an inch).
ing tendency of asphalt and the assignment of a stain index
proportional to the extent of staining observed.
4. Significance and Use
1.2 This test method is applicable to asphalts having ring-
4.1 This test method measures the tendency for oil compo-
and-ball softening points of 85°C (185°F) or greater.
nentstoseparatespontaneouslyfromasphalt.Theseparationof
NOTE 1—This test method may be modified for use with other
oil components can cause staining in asphalt roofing products
bituminous materials with softening points less than 85°C (185°F) by
and adjacent materials in storage and use.
using a different temperature than specified in Section 7 by agreement of
4.2 The stain index is related to the thermal stability of the
the interested parties. The report of results from such a test may cite this
asphalt. Higher stain index values indicate lower stability and
method but must clearly state the temperature employed in the exception
greater tendency for staining.
and acknowledge that the interpretation of results in Section 9 and the
precision and bias stated in Section 10 may not apply. 4.3 Usethisproceduretodeterminethestainingtendencyof
asphalt and to compare the results against a material for which
1.3 The values stated in SI units are to be regarded as the
the staining tendency is known.
standard. The values in parentheses are for information only.
1.4 This standard does not purport to address the safety
5. Apparatus
concerns, if any, associated with its use. It is the responsibility
5.1 Rings—Square shouldered brass retaining rings con-
of the user of this standard to establish appropriate safety and
forming to the dimensions required for use in the ring-and-ball
health practices and determine the applicability of regulatory
softening point apparatus (see Fig. 1 (a) ofTest Method D36).
limitations prior to use.
5.1.1 The inside diameter of the ring to be placed in contact
2. Referenced Documents with the filter paper during the test is 16 mm ( ⁄64ths of an
inch).
2.1 ASTM Standards:
D36 Test Method for Softening Point of Bitumen (Ring-
NOTE 2—This test method depends on accurate measurement of diam-
and-Ball Apparatus)
eterandprecisealignmentofthefaceandrimoftheringonaflatsurface.
Therefore, deformed rings must not be used.
D140 Practice for Sampling Bituminous Materials
E1 Specification for ASTM Thermometers
5.2 Pouring Plate—A flat, smooth, brass plate approxi-
mately 50 by 75 mm (2 by 3 in.).
3. Summary of Test Method
5.3 Paper—Filterpaperofthestandarddoubleacid-washed
3.1 A horizontal disc of asphalt, cast in a brass retaining 5
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.
diameter of the brass ring to determine the staining character-
5.4 Support Plate—A flat, clean, smooth metal plate ap-
proximately1.5mm( ⁄16in.)thickandareaatleastsufficientto
support the size of filter paper being used.
This test method is under the jurisdiction of ASTM Committee D08 on
Roofing,Waterproofing,andBituminousMaterialsandisthedirectresponsibilityof
Subcommittee D08.02 on Prepared Roofings, Shingles and Siding Materials.
Current edition approved June 10, 1997. Published January 1998. Originally The sole source of supply of the paper known to the committee at this time is
published as D2746 – 91. Last previous edition D2746 – 91. Whatman No. 40 filter paper, available from laboratory supply and service
Annual Book of ASTM Standards, Vol 04.04. companies.Ifyouareawareofalternativesuppliers,pleaseprovidethisinformation
Annual Book of ASTM Standards, Vol 04.03. to ASTM International Headquarters. Your comments will receive careful consid-
Annual Book of ASTM Standards, Vol 14.03. erationatameetingoftheresponsibletechnicalcommittee, whichyoumayattend.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D2746
5.5 Oven—A constant temperature oven capable of main- 7.6.1 Alternatively, use the hole template and determine the
taining the test temperature of 80°C (175°F) within 61°C diameter of the hole which best fits the stained circle on the
(62°F). filter paper and record the result numerically in 0.4–mm units
5.6 Thermometer—An ASTM high softening point ther- (64ths of an inch) to the nearest 0.4 mm ( ⁄64in.).
mometer having a range from 30 to 200°C (85 to 392°F), and
8. Calculation and Interpretation of Results
conformingtotherequirementsforThermometer16C(or16F)
8.1 Subtract the initial diameter of the asphalt disc ex-
as prescribed in Specification E1.
pressednumericallyin0.4–mmunits(64thsofaninch),thatis,
5.7 Measuring Rule—A steel rule graduated in 0.5 mm
40 from the average, or best fit, diameter of the stained c
...
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