ASTM D7308-07(2012)
(Practice)Standard Practice for Sample Preparation of Thermoplastic Traffic Marking Materials
Standard Practice for Sample Preparation of Thermoplastic Traffic Marking Materials
SIGNIFICANCE AND USE
5.1 This practice provides a standard procedure for the preparation of thermoplastic traffic marking material test specimens prior to testing for various properties as called for in the governing specification. Specimens that are prepared using this standard methodology yield test results that are consistent with the material from which it was sampled. Test results from specimens can be used to determine compliance of the thermoplastic traffic marking material to the specification. This sample preparation guide can also be used by manufacturers of these materials to prepare specimens for testing to determine the uniformity of thermoplastic traffic marking materials from batch to batch.
5.2 This practice does not address any issues related to specific testing of the thermoplastic pavement marking materials for any physical or chemical property.
SCOPE
1.1 This practice covers the proper preparation of test specimens of thermoplastic traffic marking materials obtained to ensure test results are representative of the material being tested.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D7308 − 07 (Reapproved 2012)
Standard Practice for
Sample Preparation of Thermoplastic Traffic Marking
Materials
This standard is issued under the fixed designation D7308; 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.
1. Scope governing specification the sample can then be exposed to the
required heating time and conditions prior to the preparation of
1.1 This practice covers the proper preparation of test
the test specimens or the test specimens may be prepared
specimens of thermoplastic traffic marking materials obtained
immediately after the material has reached application tem-
to ensure test results are representative of the material being
peratures.
tested.
4.2 If required by the governing specification that the
1.2 The values stated in SI units are to be regarded as the
sample be subjected to extended periods of heating prior to the
standard. The values given in parentheses are for information
preparation of the test specimen in order to determine the effect
only.
of heat history upon various physical or chemical properties,
1.3 This standard does not purport to address all of the
thesamplemustbemelteddownintheprescribedmannerprior
safety concerns, if any, associated with its use. It is the
to being subjected to such conditions.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Significance and Use
bility of regulatory limitations prior to use.
5.1 This practice provides a standard procedure for the
2. Referenced Documents
preparation of thermoplastic traffic marking material test speci-
2.1 ASTM Standards:
mens prior to testing for various properties as called for in the
D7307 Practice for Sampling ofThermoplasticTraffic Mark-
governing specification. Specimens that are prepared using this
ing Materials
standard methodology yield test results that are consistent with
the material from which it was sampled. Test results from
3. Terminology
specimens can be used to determine compliance of the ther-
3.1 Definitions of Terms Specific to This Standard: moplastic traffic marking material to the specification. This
sample preparation guide can also be used by manufacturers of
3.1.1 thermoplastic traffıc marking material, n—a highly
filled 100 % total solids highway marking material that when these materials to prepare specimens for testing to determine
heated to a molten state can be extruded or sprayed onto a road the uniformity of thermoplastic traffic marking materials from
surface and when cooled forms a solid, durable delineator. batch to batch.
5.2 This practice does not address any issues related to
4. Summary of Practice
specific testing of the thermoplastic pavement marking mate-
4.1 The thermoplastic traffic marking material is prepared
rials for any physical or chemical property.
for the testing of various physical and chemical properties as
outlined in the governing specification by melting a sample of
6. Apparatus
the marking material to its application temperature under
6.1 Procedure A (Preferred):
continuous agitation. Depending upon the requirements of the
6.1.1 Stainless Steel 4000 ml Beaker, 150 by 230-mm
diameter high. Alternatively an unlined 0.95 L (1 qt) or 3.48 L
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
(1 gal) can may be used depending on the sample size.
Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.44 on Traffic Coatings.
6.1.2 Heating Mantle of sufficient size. Note that aluminum
Current edition approved June 1, 2012. Published August 2012. Originally
foil may be used to serve as somewhat of a gasket if an unlined
approved in 2007. Last previous edition approved in 2007 as D7308 – 07. DOI:
metal can is to be used in the heating mantle in place of the
10.1520/D7308-07R12.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or stainless steel beaker.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.1.3 Temperature Indicator.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 6.1.4 Thermocouple, iron.
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D7308 − 07 (2012)
6.1.5 Mechanical Stirrer, capable of stirring. The stirrer mounted to keep the unit away from heat, dirt, and vibrations.
should consist of two impellers with a diameter of approxi- When the unit is ready for operation, make a test melt in order
mately 63.5 mm mounted on a 7.95-mm diameter shaft of to set the proportional band and other adjustment to give a
sufficient length. controlled temperature of 218 6 1°C (425 6 2°F).
6.1.6 Aluminum Lid to cover the top of the container with a 8.2.1.2 Place one-third to one-half of the granular sample
slot to clear the shaft of the mechanical stirrer and the into the container residing in the heating mantle. Attach the
thermocouple. stirring shaft to the mechanical stirrer.
6.1.7 Stainless Steel Ladles with a pouring spout, 60-ml 8.2.1.3 Turn on the power to the heating mantle and the
capacity. controller. Start the variable speed mechanical stirrer when the
6.1.8 Tachometer to measure shaft speed of the mechanical thermoplastic material has softened sufficiently.
mixer. 8.2.1.4 Slowly add the remainder of the granu
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