ASTM D4061 - 13(2018) - Standard Test Method for Retroreflectance of Horizontal Coatings

ASTM D4061 - 13(2018)

Standard Test Method for Retroreflectance of Horizontal Coatings

Status : Current   Published : October 2018



1.1 This test method describes the instrumental measurement of the retroreflective properties of horizontal surfacing materials, such as traffic stripe paint systems, traffic tapes, and traffic surface symbols.

1.2 Specimen preparation, size, and shape must be determined and specified by the user of this test method. Likewise, the user must specify the observation and entrance angles to be used (see Fig. 1).

FIG. 1 Diagram Illustrating Geometry for Measurement of Horizontal Coatings Specimens

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[This image has been removed.]

Note 1:  Includes observation angle α, entrance angle β, viewing angle ν a, co-viewing angle ν c, and co-entrance angle β c. The retroreflector axis, illumination axis, and observation axis all lie in the same plane.

1.3 The geometric requirements of this test method are based on materials for which the relative retroreflectance changes less than approximately 50 % over the observation angle range from 0.2 to 0.5°. This is illustrated in Fig. 2.

FIG. 2 Illustration of Typical Rate of Change of Retroreflectance Versus Observation Angle for Horizontal Retroreflective Material Measured at 86° Entrance Angle

[This image has been removed.]

[This image has been removed.]

1.4 This test method is a laboratory test and requires a facility that can be darkened sufficiently so that stray light does not affect the test results. This facility must be capable of housing the required 15-m test distance.

1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.6  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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.7  This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

Standard NumberASTM D4061 - 13(2018)
TitleStandard Test Method for Retroreflectance of Horizontal Coatings
Publication Date01 October 2018
Normative References(Required to achieve compliance to this standard)No other standards are normatively referenced
Informative References(Provided for Information)No other standards are informatively referenced
Descriptors Coefficient of retroreflected luminance, horizontal coatings, pavement markings, retroreflection
File Size340 KB

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