ASTM D7735-11(2016)
(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.
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Designation: D7735 − 11 (Reapproved 2016)
Standard Test 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. Scope Traffic Marking Materials
E177 Practice for Use of the Terms Precision and Bias in
1.1 This test method covers Type A Durometer hardness of
ASTM Test Methods
road marking thermoplastic material at elevated temperatures.
E691 Practice for Conducting an Interlaboratory Study to
1.2 This test method is similar to Test Method D2240 for
Determine the Precision of a Test Method
hardness with special attention given to keeping the tempera-
ture of the test sample and instrument constant. Within the 3. Terminology
highway materials community, it is sometimes known as
3.1 Definitions:
“indentation resistance.”
3.1.1 The terms and definitions in Terminology D16 apply
1.3 All materials, instruments or equipment used for the to this method.
determination of temperature, hardness and time shall be 3.1.2 hardness, adv—the value of resistance of a small
traceable to National Institute of Standards and Technology or penetrating device. In the case of the Type A Durometer in
other internationally recognized organizations parallel in na- accordance with Test Method D2240, the presser foot/indentor
ture. (spherical to 0.79 6 0.03 mm or 0.03 6 0.001 in.) is connected
to a spring loaded to a total of 0.075 N/Durometer units at full
1.4 The values stated in SI units are to be regarded as
deflection. For reading of Type A hardness the instruments
standard. The values given in parentheses are for information
scale reads from 0 to 100. Minimal deflection is 0 (softest) and
only.
maximum is 100 (hardest).
1.5 This standard does not purport to address all of the
3.1.3 thermoplastic, n—traffic marking (same as 3.1.4).
safety concerns, if any, associated with its use. It is the
3.1.4 thermoplastic traffıc marking—a highly filled 100 %
responsibility of the user of this standard to establish appro-
total solids highway marking system that when heated to a
priate safety and health practices and determine the applica-
moltenstatecanbeextrudedorsprayedontoaroadsurfaceand
bility of regulatory limitations prior to use.
when cooled forms a solid durable delineator or road marking
2. Referenced Documents thermoplastic usually melted to 220°C (425°F).
2
2.1 ASTM Standards:
4. Summary of Test Method
D16 TerminologyforPaint,RelatedCoatings,Materials,and
4.1 This method was developed to enable the testing of
Applications
hardness or indentation resistance of road marking thermoplas-
D2240 Test Method for Rubber Property—Durometer Hard-
tic material at ambient roadway/highway temperatures. Due to
ness
the speed at which basic road marking thermoplastic cools,
D7307 PracticeforSamplingofThermoplasticTrafficMark-
testing its hardness at elevated temperatures is difficult, even at
ing Materials
a relatively low 46°C (115°F). Existing non-standard methods
D7308 Practice for Sample Preparation of Thermoplastic
are not consistent because they allow the samples to change
temperature during testing. By keeping both the test samples
and the hardness tester in a regulated environment before and
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint
during testing, the results are much more repeatable within a
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.44 on Traffic Coatings.
laboratory. The goal for this method is to allow results from
Current edition approved April 1, 2016. Published April 2016. Originally
this test to be more reproducible from laboratory to laboratory.
ɛ1
approved in 2011. Last previous edition approved in 2011 as D7735 – 11 . DOI:
10.1520/7735-11R16.
4.2 The methodology involves measuring the hardness of
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
roadmarking thermoplastic by keeping the test sample in the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
elevated temperature environment (a water bath) during the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. testing process and using a Durometer that can be placed in the
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D7735 − 11 (2016)
water bath and function. This method could be performed in a 9.4 Turn on
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: D7735 − 11 D7735 − 11 (Reapproved 2016)
Standard Test 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
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.
2. Referenced Documents
2
2.1 ASTM Standards:
D16 Terminology for Paint, Related Coatings, Materials, and Applications
D2240 Test Method for Rubber Property—Durometer Hardness
D7307 Practice for Sampling of Thermoplastic Traffic Marking Materials
D7308 Practice for Sample Preparation of Thermoplastic Traffic Marking Materials
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1 Definitions:
3.1.1 The terms and definitions in Terminology D16 apply to this method.
3.1.2 hardness, adv—the value of resistance of a small penetrating device. In the case of the Type A Durometer in accordance
with Test Method D2240, the presser foot/indentor (spherical to 0.79 6 0.03 mm or 0.03 6 0.001 in.) is connected to a spring
loaded to a total of 0.075 N/Durometer units at full deflection. For reading of Type A hardness the instruments scale reads from
0 to 100. Minimal deflection is 0 (softest) and maximum is 100 (hardest).
3.1.3 thermoplastic, n—traffic marking (same as 3.1.4).
3.1.4 thermoplastic traffıc marking—a highly filled 100 % total solids highway marking system that when heated to a molten
state can be extruded or sprayed onto a road surface and when cooled forms a solid durable delineator or road marking
thermoplastic usually melted to 220°C (425°F).
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.44 on Traffic Coatings.
Current edition approved Nov. 1, 2011April 1, 2016. Published December 2011April 2016. Originally approved in 2011. Last previous edition approved in 2011 as D7735
ɛ1
– 11 . DOI: 10.1520/7735-11E01.10.1520/7735-11R16.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D7735 − 11 (2016)
4. Summary of Test Method
4.1 This method was developed to enable the testing of hardness or indentation resistance of road marking thermoplastic
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 a relatively low 46°C (115°F). Existing non-standard methods are not
consistent because they allow the samples to change temperature during testing. By keeping both the test samples and the hardness
tester in a regulated environment before and during testing, the results are much more repeatable within a laboratory. The g
...
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