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ASTM E810-01

(Test Method)

Standard Test Method for Coefficient of Retroreflection of Retroreflective Sheeting Utilizing the Coplanar Geometry

Standard Test Method for Coefficient of Retroreflection of Retroreflective Sheeting Utilizing the Coplanar Geometry

SCOPE
1.1 This test method describes the instrument measurement of the retroreflective performance of retroreflective sheeting.  
1.2 The user of this test method must specify the entrance and observation angles to be used.  
1.3 This test method is intended as a laboratory test and requires a facility that can be darkened sufficiently so that stray light does not affect the test results.  
1.4 Portable and bench retroreflection measuring equipment may be used to determine RA values provided the geometry and appropriate substitutional standard reference panels, measured in accordance with this test method, are utilized. In this case the methods of Procedure B in Practice E809 apply. Additional information on the use of portable retroreflectometers may be found in Test Method E 1709.
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
09-Jun-2001
ICS
17.180.20 - Colours and measurement of light
Technical Committee
E12 - Color and Appearance
Drafting Committee
E12.10 - Retroreflection
Current Stage
Ref Project

Relations

Replaces
ASTM E810-94(2000) - Standard Test Method for Coefficient of Retroreflection of Retroreflective Sheeting Utilizing the Coplanar Geometry
Effective Date
10-Jun-2001
Replaced By
ASTM E810-03 - Standard Test Method for Coefficient of Retroreflection of Retroreflective Sheeting Utilizing the Coplanar Geometry
Effective Date
10-Feb-2003
Referred By
ASTM E3165-18 - Standard Test Method for Nighttime Retroreflected Chromaticity of Retroreflective Sheeting
Effective Date
10-Jun-2001
Referred By
ASTM E179-17(2022) - Standard Guide for Selection of Geometric Conditions for Measurement of Reflection and Transmission Properties of Materials
Effective Date
10-Jun-2001
Referred By
ASTM E2540-16(2022) - Standard Test Method for Measurement of Retroreflective Signs Using a Portable Retroreflectometer at a 0.5 Degree Observation Angle
Effective Date
10-Jun-2001
Referred By
ASTM E1709-16(2022) - Standard Test Method for Measurement of Retroreflective Signs Using a Portable Retroreflectometer at a 0.2 Degree Observation Angle
Effective Date
10-Jun-2001
Referred By
ASTM D4956-19 - Standard Specification for Retroreflective Sheeting for Traffic Control
Effective Date
10-Jun-2001
Referred By
ASTM D8514/D8514M-23 - Standard Specification for Flexible, Retroreflective Sheeting for Use in High Visibility Vehicle Markings
Effective Date
10-Jun-2001

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ASTM E810-01 - Standard Test Method for Coefficient of Retroreflection of Retroreflective Sheeting Utilizing the Coplanar GeometryASTM E810-01 - Standard Test Method for Coefficient of Retroreflection of Retroreflective Sheeting Utilizing the Coplanar Geometry
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ASTM E810-01 - Standard Test Method for Coefficient of Retroreflection of Retroreflective Sheeting Utilizing the Coplanar Geometry
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: E 810 – 01
Standard Test Method for
Coefficient of Retroreflection of Retroreflective Sheeting
1
Utilizing the Coplanar Geometry
This standard is issued under the fixed designation E 810; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 2.2 Other Document:
CIE Publication No 54 Retroreflection—Definition and
1.1 This test method describes an instrument measurement
4
Measurement
of the retroreflective performance of retroreflective sheeting.
1.2 The user of this test method must specify the entrance
3. Terminology
and observation angles to be used, and may specify the rotation
3.1 The terms and definitions in Terminology E 284 and
angles.
Practice E 808 apply to this test method.
1.3 This test method is intended as a laboratory test and
3.2 Definitions:
requires a facility that can be darkened sufficiently so that stray
3.2.1 coeffıcient of retroreflection, R —of a plane retrore-
A
light does not affect the test results. The testing apparatus must
flecting surface, the ratio of the coefficient of luminous
be able to achieve the coplanar geometry.
intensity (R ) to the area (A), expressed in candelas per lux per
I
1.4 Portable and bench retroreflection measuring equipment
−1 −2
square metre (cd·lx ·m ). R = R /A.
A I
may be used to determine R values provided the geometry and
A
3.2.1.1 Discussion—The equivalent inch–pound units for
appropriate substitution standard reference panels, measured in
coefficient of retroreflection are candelas per foot-candle per
accordance with this test method, are utilized. In this case the
−1 −2
square foot (cd·fc ·ft ). The SI and inch pound units are
methods of Procedure B in Practice E 809 apply. Additional
numerically equal, because the units of R reduce to 1/sr. An
A
information on the use of portable retroreflectometers may be
equivalent term used for coefficient of retroreflection is specific
found in Test Method E 1709.
intensity per unit area, with symbol SIA or the CIE symbol R8.
1.5 This standard does not purport to address all of the
The term coefficient of retroreflection and the symbol R along
A
safety concerns, if any, associated with its use. It is the
with the SI units of candelas per lux per square meter
responsibility of the user of this standard to establish appro-
−1
−2
(cd·lx ·m ) are recommended by ASTM.
priate safety and health practices and determine the applica-
3.2.1.2 Discussion—R is a useful engineering quantity for
A
bility of regulatory limitations prior to use.
determining the photometric performance of such retroreflec-
2. Referenced Documents tive surfaces as highway delineators or warning devices. R
A
may also be used to determine the minimum area of retrore-
2.1 ASTM Standards:
2
flective sheeting necessary for a desired level of photometric
E 284 Terminology of Appearance
performance. R has been used extensively in the specification
E 308 Practice for Computing the Colors of Objects by A
2
of retroreflective sheeting.
Using the CIE System
3.2.2 coplanar geometry, n—retroreflection geometry in
E 691 Practice for Conducting an Interlaboratory Study to
3
which the retroreflector axis, illumination axis, and observation
Determine the Precision of a Test Method
2 axis lie in one plane.
E 808 Practice for Describing Retroreflection
3.2.2.1 Discussion—In the coplanar geometry: the second
E 809 Practice for Measuring Photometric Characteristics
2 entrance angle component, b , is equal to 0°; presentation
of Retroreflectors 2
angle, g, is equal to either 0° or 180°; orientation angle, v ,is
s
E 1709 Test Method for Measurement of Retroreflective
2 equal to either the rotation angle, e,orto e + 180° or e − 180°.
Signs Using a Portable Retroreflectivemeter
3.2.3 datum axis, n—a designated half-line from the retrore-
flector center perpendicular to the retroreflector axis.
1
This test method is under the jurisdiction of ASTM Committee E12 on Color
and Appearance and is the direct responsibility of Subcommittee E12.10 on
Retroreflection.
Current edition approved June 10, 2001. Published August 2001. Originally
published as E 810 – 81. Last previous edition E 810 – 94 (2000).
2 4
Annual Book of ASTM Standards, Vol 06.01. Available from USNC/CIE Publications Office, TLA Lighting Consultants, Inc.
3
Annual Book of ASTM Standards, Vol 14.02. 77 Pond St., Salem, MA 01970.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
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1.1 This guide is intended for use in selecting terminology, measurement scales, and instrumentation for describing or evaluating such appearance characteristics as glossiness, opacity, lightness, transparency, and haziness in terms of reflected or transmitted light. This guide does not consider the spectral variations responsible for color, but the geometric variables described herein can importantly affect instrumentally measured values of color. This guide is general in scope rather than specific as to instrument or material.  
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ASTM E2301-12(2022)(Test Method)
Standard Test Method for Daytime Colorimetric Properties of Fluorescent Retroreflective Sheeting and Marking Materials for High Visibility Traffic Control and Personal Safety Applications Using 45°:Normal Geometry

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5.1 This test method provides procedures for obtaining tristimulus values, luminance factors and chromaticity coordinates of fluorescent-retroreflective materials by bispectral colorimetry using a 45:0 or 0:45 optical measuring system.  
5.2 The CIE 1931 (2°) standard observer is used to calculate the colorimetric properties of fluorescent-retroreflective sheeting and markings used in daytime high visibility traffic control and personal safety applications because in practice these materials are primarily viewed from a distance where they subtend less than 4° of the visual field.  
5.3 This test method is applicable to object-color specimens of any gloss level.  
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5.5 This test method is suitable for quality control testing of fluorescent-retroreflective sheeting and marking materials.
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5.4 The use of this test method for determining the luminous reflectance factor is required by Classification E1264.
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