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ASTM D7735-11e1

(Test Method)

Standard Test Method for Type A Durometer Hardness Testing of Road Marking Thermoplastic at Elevated Temperatures

Standard Test Method for Type A Durometer Hardness Testing of Road Marking Thermoplastic at Elevated Temperatures

SIGNIFICANCE AND USE
5.1 This method is based on the penetration of a specific type of indentor when forced into the material under specified conditions. The indentation hardness is inversely related to the penetration and is dependent on the elastic modulus, viscoelastic behavior of the material, geometry of the indentor, the applied force and temperature at test. This test method is empirical and therefore primarily for control purposes. No simple relationship exists between indentation hardness determined by this test method and any fundamental property of the material tested.
SCOPE
1.1 This test method covers Type A Durometer hardness of road marking thermoplastic material at elevated temperatures.  
1.2 This test method is similar to Test Method D2240 for hardness with special attention given to keeping the temperature of the test sample and instrument constant. Within the highway materials community, it is sometimes known as “indentation resistance.”  
1.3 All materials, instruments or equipment used for the determination of temperature, hardness and time shall be traceable to National Institute of Standards and Technology or other internationally recognized organizations parallel in nature.  
1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.  
1.5 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
31-Oct-2011
ICS
93.080.30 - Road equipment and installations
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.44 - Traffic Coatings
Current Stage
Ref Project

Relations

Replaces
ASTM D7735-11 - Standard Test Method for Type A Durometer Hardness Testing of Road Marking Thermoplastic at Elevated Temperatures
Effective Date
01-Nov-2011
Replaced By
ASTM D7735-11(2016) - Standard Test Method for Type A Durometer Hardness Testing of Road Marking Thermoplastic at Elevated Temperatures
Effective Date
01-Apr-2016
Referred By
ASTM D7942-15(2023) - Standard Specification for Thermoplastic Pavement Markings in Non Snow Plow Areas
Effective Date
01-Nov-2011

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ASTM D7735-11e1 - Standard Test Method for Type A Durometer Hardness Testing of Road Marking Thermoplastic at Elevated TemperaturesASTM D7735-11e1 - Standard Test Method for Type A Durometer Hardness Testing of Road Marking Thermoplastic at Elevated Temperatures
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ASTM D7735-11e1 - Standard Test Method for Type A Durometer Hardness Testing of Road Marking Thermoplastic at Elevated Temperatures
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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
´1
Designation: D7735 − 11
StandardTest Method for
Type A Durometer Hardness Testing of Road Marking
1
Thermoplastic at Elevated Temperatures
This standard is issued under the fixed designation D7735; 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
ε NOTE—Section 6.4 was corrected editorially in January 2014.
1. Scope D7308 Practice for Sample Preparation of Thermoplastic
Traffic Marking Materials
1.1 This test method covers Type A Durometer hardness of
E177 Practice for Use of the Terms Precision and Bias in
road marking thermoplastic material at elevated temperatures.
ASTM Test Methods
1.2 This test method is similar to Test Method D2240 for
E691 Practice for Conducting an Interlaboratory Study to
hardness with special attention given to keeping the tempera-
Determine the Precision of a Test Method
ture of the test sample and instrument constant. Within the
highway materials community, it is sometimes known as
3. Terminology
“indentation resistance.”
3.1 Definitions:
1.3 All materials, instruments or equipment used for the
3.1.1 The terms and definitions in Terminology D16 apply
determination of temperature, hardness and time shall be
to this method.
traceable to National Institute of Standards and Technology or
3.1.2 hardness, adv—the value of resistance of a small
other internationally recognized organizations parallel in na-
penetrating device. In the case of the Type A Durometer in
ture.
accordance with Test Method D2240, the presser foot/indentor
1.4 The values stated in SI units are to be regarded as
(spherical to 0.79 6 0.03 mm or 0.03 6 0.001 in.) is connected
standard. The values given in parentheses are for information
to a spring loaded to a total of 0.075 N/Durometer units at full
only.
deflection. For reading of Type A hardness the instruments
1.5 This standard does not purport to address all of the
scale reads from 0 to 100. Minimal deflection is 0 (softest) and
safety concerns, if any, associated with its use. It is the
maximum is 100 (hardest).
responsibility of the user of this standard to establish appro-
3.1.3 thermoplastic, n—traffic marking (same as 3.1.4).
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 3.1.4 thermoplastic traffıc marking—a highly filled 100 %
total solids highway marking system that when heated to a
2. Referenced Documents
moltenstatecanbeextrudedorsprayedontoaroadsurfaceand
2
when cooled forms a solid durable delineator or road marking
2.1 ASTM Standards:
thermoplastic usually melted to 220°C (425°F).
D16 TerminologyforPaint,RelatedCoatings,Materials,and
Applications
4. Summary of Test Method
D2240 Test Method for Rubber Property—Durometer Hard-
ness
4.1 This method was developed to enable the testing of
D7307 PracticeforSamplingofThermoplasticTrafficMark-
hardness or indentation resistance of road marking thermoplas-
ing Materials
tic material at ambient roadway/highway temperatures. Due to
the speed at which basic road marking thermoplastic cools,
testing its hardness at elevated temperatures is difficult, even at
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint
a relatively low 46°C (115°F). Existing non-standard methods
and Related Coatings, Materials, andApplications and is the direct responsibility of
are not consistent because they allow the samples to change
Subcommittee D01.44 on Traffic Coatings.
temperature during testing. By keeping both the test samples
Current edition approved Nov. 1, 2011. Published December 2011. DOI:
10.1520/7735-11E01.
and the hardness tester in a regulated environment before and
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
during testing, the results are much more repeatable within a
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
laboratory. The goal for this method is to allow results from
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. this test to be more reproducible from laboratory to laboratory.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
´1
D7735 − 11
4.2 The methodology involves measuring the hardness of 9.2 Pour thermoplastic that has been heated to 425°F (or per
roadmarking thermoplastic by keeping the test sample in the manufacturer’s recommendation) into a 20 mL aluminum pan
elevated temperature environment (a water bath) during the to approximately half full, and then allow cooling to room
t
...

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