Designation standards: ASTM C609-20 Note: WITHDRAWN Publication date standards: 1.4.2020 SKU: NS-991918 The number of pages: 5 Approximate weight : 15 g (0.03 lbs) Country: American technical standard Category:Technical standards ASTM
Keywords: color differences, color equations, color measurement, glaze color, light reflectance, tristimulus ,, ICS Number Code 91.100.25 (Terracotta building products)
Additional information
Significance and Use
5.1?This
test method describes the means of determining the LRV of a tile
specimen. Certain building codes require the use of materials rated
by LRV. Application of this test method provides the means for
rating ceramic tile. LRVs reported for ceramic tile should include
reference to the observer and illuminant for which the rating is
valid.
5.2?LRV
is a property dependent on the overall color of a tile specimen.
Control of LRV is achieved through control of color and adherence
to color specifications will govern the acceptability of a product
with respect to LRV. Therefore, a product cannot be judged as
having an unacceptable LRV unless the color of the product is found
to be unacceptable.
5.3?Mixtures of several tile products are
commonly installed on a surface, requiring a means to calculate LRV
for a product mix. The rating obtained for an individual tile
product can be used to calculate the LRV for a product mix using
the following equation:
FIG.
2 Example of Product Mix Used on Surface
5.4?The
test method described herein provides instrumental means as the
basis for judging color difference. Magnitude of color difference
between pairs of ceramic tile can be determined and expressed in
numerical terms.
5.5?Based on interlaboratory
investigation,5.6?The
test method requires the use of multiple illuminants for the
determination of color difference between solid-colored tiles.
Evaluation under incandescent, fluorescent and daylight illuminant
conditions ensure the color differences calculated between a test
and reference specimen account for the possible occurrence of
metamerism.
1. Scope
1.1?This
test method covers the measurement of Light Reflectance Value (LRV)
and visually small color difference between pieces of glazed or
unglazed ceramic tile, using any spectrophotometer that meets the
requirements specified in the test method. LRV and the magnitude
and direction of the color difference are expressed numerically,
with sufficient accuracy for use in product specification.
1.2 LRV
may be measured for either solid-colored tile or tile having a
multicolored, speckled, or textured surface. For tile that are not
solid-colored, an average reading should be obtained from multiple
measurements taken in a pattern representative of the overall
sample as described in 9.2 of
this test method. Small color difference between tiles should only
be measured for solid-color tiles. Small color difference between
tile that have a multicolored, speckled, or textured surface are
not valid.
1.3?For
solid colored tile, a comparison of the test specimen and reference
specimen should be made under incandescent, fluorescent and
daylight illuminant conditions. The use of multiple illuminants
allows the color difference measurement to be made without the risk
of wrongly accepting a match when the tiles being compared are
metamers (see 3.1.4).
1.4?The
values stated in inch-pound units are to be regarded as standard.
The values given in parentheses are provided for information only
and are not considered standard.
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, health, and environmental practices
and determine the applicability of regulatory limitations prior to
use.
1.6?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.
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