ASTM D7308-07
(Practice)Standard Practice for Sample Preparation of Thermoplastic Traffic Marking Materials
Standard Practice for Sample Preparation of Thermoplastic Traffic Marking Materials
SIGNIFICANCE AND USE
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.
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.
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.
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Standards Content (Sample)
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Designation: D7308 − 07
StandardPractice 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 required heating time and conditions prior to the preparation of
the test specimens or the test specimens may be prepared
1.1 This practice covers the proper preparation of test
immediately after the material has reached application tem-
specimens of thermoplastic traffic marking materials obtained
peratures.
to ensure test results are representative of the material being
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,
thesamplemustbemelteddownintheprescribedmannerprior
1.3 This standard does not purport to address all of the
to being subjected to such conditions.
safety concerns, if any, associated with its use. It is the
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
preparation of thermoplastic traffic marking material test speci-
2. Referenced Documents
mens prior to testing for various properties as called for in the
2.1 ASTM Standards:
governing specification. Specimens that are prepared using this
D7307 Practice for Sampling ofThermoplasticTraffic Mark-
standard methodology yield test results that are consistent with
ing Materials
the material from which it was sampled. Test results from
specimens can be used to determine compliance of the ther-
3. Terminology
moplastic traffic marking material to the specification. This
3.1 Definitions of Terms Specific to This Standard:
sample preparation guide can also be used by manufacturers of
3.1.1 thermoplastic traffıc marking material, n—a highly
these materials to prepare specimens for testing to determine
filled 100 % total solids highway marking material that when
the uniformity of thermoplastic traffic marking materials from
heated to a molten state can be extruded or sprayed onto a road
batch to batch.
surface and when cooled forms a solid, durable delineator.
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
governing specification the sample can then be exposed to 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
(1 gal) can may be used depending on the sample size.
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
Related Coatings, Materials, and Applications and is the direct responsibility of 6.1.2 Heating Mantle of sufficient size. Note that aluminum
Subcommittee D01.44 on Traffic Coatings.
foil may be used to serve as somewhat of a gasket if an unlined
Current edition approved Jan. 1, 2007. Published March 2007. DOI: 10.1520/
metal can is to be used in the heating mantle in place of the
D7308-07.
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
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 granular sample at
...
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