ASTM E1348-90
(Test Method)Standard Test Method for Transmittance and Color by Spectrophotometry Using Hemispherical Geometry
Standard Test Method for Transmittance and Color by Spectrophotometry Using Hemispherical Geometry
General Information
Standards Content (Sample)
ASTM EL348 'i0 m 0759530 0058258 T m
AMERICAN SOCIETY FOR TESTINQ AND MATERIALS
Designation: E 1348 - 90
1916 Race SI. Philadelphia. Pa. 19103
Reprinied from lha Annual 8ook d ACTM Standards, Cmight ASTM
. If listed in the current combined index, win appear in the wt edition.
Standard Test Method for
Transmittance and Color by Spectrophotometry Using
Hemispherical Geometry'
This standard is issued under the fixed designation E 1348: 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
suprscript epsilon (0 indicates an editorial change since the last revision or reapproval.
4. Summary of Test Method
1. Scope
1.1 This test method describes the instrumental measure- 4.1 This test method provides a procedure for measuring
the transmittance of transmitting specimens by using a
ment of the transmission properties and color of object-color
spectrophotometer or spectrocolorimeter equipped with a
specimens by the use of a spectrophotometer or spectrocol-
hemispherical optical measuring system such as an inte-
orimeter with a hemispherical optical measuring system,
such as an integrating sphere. grating sphere.
4.2 This test method includes procedures for calibrating
1.2 This test method is generally suitable for all fully
transparent specimens without regard for the specimen the instrument and for selecting specimens suitable for
position relative to the transmission port of the instrument. precision measurement.
4.3 This test method is satisfactory for all fully transparent
Translucent specimens, however, must be placed flush
against the transmission port of the sphere. specimens with plane and parallel surfaces. When possible,
the user should select the position of the specimen in the
1.3 This standard may involve hazardous materials, oper-
ations, and equipment. This standard does not purport to transmission compartment to provide either essentially total
address all of the safety problems associated with its use. It is or essentially regular transmittance, depending on the end
the responsibilify of the user of this standard to establish use of the measured data.
appropriale safety and health practices and determine the 4.4 Accurate measurement of translucent specimens re-
applicability of regdatory limitations prior to use. quires that the specimen be placed flush against the transmis-
sion port of the integrating sphere (see Practice E 1164,
8.1.4).
2. Referenced Documents
4.5 Most modern spectrophotometers have the capacity to
compute the color coordinates of the specimen during the
2,1 ASTM Standards:
measurement. When this is the case, the user of this test
D 1003 Test Method for Haze and Luminous Transmit-
method must select the color system, observer, and
tance of Transparent Plastics'
illuminant (see Method E 308, Section 6).
2244 Method for Calculation of Color Differences from
D
Instrumentally Measured Color Coordinates3
5. Significance and Use
E 179 Guide for Selection of Geometric Conditions for
Measurement of Reflection and Transmission Proper-
5.1 The most direct and accessible methods for obtaining
ties of Materials4
the color coordinates of object colors are by instrumental
284 Definitions of Terms Relating to Appearance of
E
measurement using spectrophotometers or colorimeters with
Materials4
either hemispherical or bidirectional optical measuring sys-
E 308 Method for Computing the Colors of Objects by
tems. This test method provides procedures for such mea-
Using the CIE System4
surement by transmittance spectrophotometry using a hemi-
E 805 Practice for Identification of Instrumental Methods
spherical optical measuring system.
of Color or Color-Difference Measurement of Materials4
5.2 This test method is especially suitable for measure-
E 1 164 Practice for Obtaining Spectrophotometric Data
ment of the following types of specimens (see also Guide
for Object-Color Evaluation4
E 179 and Practice E 805):
5.2.1 Fully transparent specimens (free from turbidity,
haze, or translucency), and
3. Terminology
5.2.2 Translucent or hazy specimens, provided that the
3.1 DeJNzitions:
specimen can be placed flush against the transmission port of
3.1.1 The definitions in Guide E 179, Definitions E 284,
the integrating sphere.
and Practice E 1 164 are applicable to this test method.
5.3 This test method is not recommended for measure-
ment of transparent or translucent retroreflective or fluores-
cent specimens.
I This test method is under the jurisdiction of ASTM Committee E-I2 on
Appannce of Matcrials and is the direct responsibility of Subcommittee E12.02
6. Apparatus
o11 Spcclrophotonictry and Colorimetry.
C,rrcnt cditioii approved March 30, 1990. Publishcd May 1990.
6. I Spectrophotometer or Spectrocolorimeter, designed for
- Aiiiirrirl Book of ASThf Sluiidurd
...
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