ISO 5154:2022

INTERNATIONAL ISO
STANDARD 5154
First edition
2022-07
Decorative metallic coatings for
radio wave transmissive application
products — Designation and
characterization method
Revêtements métalliques décoratifs pour les produits d'application
transmettant les ondes radio — Désignation et méthode de
caractérisation
Reference number
© ISO 2022
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Designation . 2
4.1 General . 2
4.2 Elementary symbol. 2
4.3 Transmission loss of radio wave . 2
4.3.1 Frequency classification . 3
4.3.2 Transmission loss of radio wave . 3
4.4 Lightness and hue . 3
4.4.1 Lightness . 3
4.4.2 Hue . 3
4.5 Main component element of coating. 4
4.6 Manufacturing method . 4
4.7 Example of designation . 4
5 Characterization . 5
5.1 Transmission loss of radio wave . 5
5.2 Lightness and hue . 5
5.3 Sampling . 5
Annex A (informative) Transmission loss measurement . 6
Annex B (informative) Colour measurement .11
Bibliography .20
iii
Foreword
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This document was prepared by Technical Committee ISO/TC 107, Metallic and inorganic coatings,
Subcommittee SC 9, Physical vapour deposition coatings.
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iv
Introduction
This document was developed to provide the designation of the characteristics of the decorative
metallic coatings for radio wave transmissive application products, in response to worldwide demand
for the standardization of such products. This document was also developed to specify the standard
method to quantitatively characterize the decorative parts with the metallic coatings that both have
the low transmission loss of radio wave and the metallic appearance.
One of the typical applications of the radio wave transmissive application products is the metallized
plastic emblem and other decorative exterior parts for automobiles. These parts are placed in front of
the millimetre wave radar transmitter-receivers of the collision prevention system. A typical example
of these parts has the low transmission loss of the specific radio wave lower than 2,5 dB and the bright
metallic appearance with lightness of 70 or higher. Low transmission loss is consistent with metallic
appearance by forming a discontinuous structure of metallic coatings. An example of the discontinuous
coating is the sputter-deposited film of low melting point metals such as indium having island structure.
This document specifies the designation and the characterization methods of the decorative metallic
coatings of the products for radio wave transmissive application. The designation consists of the
transmission loss of the radio wave, the frequency band of the radio wave under consideration, the
lightness and hue of the parts, as well as the main material and manufacturing process of metallic
coatings. The characterization methods consist of the determination of the transmission loss of radio
wave with specific frequency band and the evaluation of lightness and hue which represent the colour
and appearance.
Examples of measurement results of the radio wave transmission loss and the colour characteristics
are described in Annex A and Annex B, respectively. The information in annexes is for the convenience
of users and does not constitute an endorsement by ISO.
v
INTERNATIONAL STANDARD ISO 5154:2022(E)
Decorative metallic coatings for radio wave transmissive
application products — Designation and characterization
method
1 Scope
This document specifies the designation and the characterization methods of the decorative metallic
coatings of the products for radio wave transmissive application. The designation consists of the
transmission loss of the radio wave, the frequency band of the radio wave under consideration, the
lightness and hue of the parts, as well as the main material and manufacturing process of metallic
coatings. The characterization methods consist of the determination of the transmission loss of radio
wave with specific frequency band and the evaluation of lightness and hue which represent the colour
and appearance.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 2080, Metallic and other inorganic coatings — Surface treatment, metallic and other inorganic coatings
— Vocabulary
ISO 4519, Electrodeposited metallic coatings and related finishes — Sampling procedures for inspection by
attributes
ISO/CIE 11664-4, Colorimetry — Part 4: CIE 1976 L*a*b* colour space
ISO 16348, Metallic and other inorganic coatings — Definitions and conventions concerning appearance
IEC 60050, The international electrotechnical vocabulary
IEC 62431, Measurement Methods for Reflectivity of Electromagnetic Wave Absorbers in Millimetre Wave
Frequency
CIE S 017, International Lighting Vocabulary
JIS Z 8721, Specification of colours according to their three attributes
ASTM-D 1535, Standard Practice for Specifying Color by the Munsell System
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 2080, ISO 16348, IEC 60050
and CIE S 017 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
VNA
vector network analyser
instrument to measure the transfer and/or impedance characteristics, that is, both magnitude and
phase changes, of a linear network, device, or material through stimulus response testing over a given
frequency range
3.2
TRL calibration method
thru-reflect-line calibration method
one of the calibration methods to fix the systematic errors with the network analyser measurements
using a zero-length "thru", a longer "thru" (called “line”), and high-reflect standards
3.3
skin depth
depth at which the current density in a conducting material is reduced to 1/e times the surface current
density, at a given frequency
3.4
SCI
specular component include
type of colour measurements including both specular and diffused reflected light
3.5
SCE
specular component exclude
type of colour measurements excluding any specular reflected light
4 Designation
4.1 General
A designation consists of the following:
a) the letters, "StM", as the elementary symbol indicating that the decorative metallic coating has
ability for radio wave transmittance and metallic appearance;
b) a letter indicating the frequency band classification;
c) the letter "T" and a number giving the transmission loss followed by a solidus (/);
d) the letter "L" and a number indicating the lightness;
e) letters indicating the hue followed by a solidus (/);
f) an elemental symbol of the main component element of coatings followed by a solidus (/);
g) letters indicting the manufacturing method of coatings.
4.2 Elementary symbol
The elementary symbol, StM, shall indicate that the decorative metallic coating has ability for radio
wave transmittance and metallic appearance.
4.3 Transmission loss of radio wave
The following letters and numbers designate the frequency band of the radio wave under consideration
and the transmission loss due to reflection and absorption.
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