ISO 17449:2015

DRAFT INTERNATIONAL STANDARD
ISO/DIS 17449
ISO/TC 22/SC 11 Secretariat: ANSI
Voting begins on: Voting terminates on:
2014-08-25 2014-11-25
Road vehicles — Safety glazing materials — Test methods
for properties of electrically heated glazing
Véhicules routiers — Vitrages de sécurité — Méthodes d’essai pour les propriétés des vitrages chauffés
électriquement
ICS: 43.040.65
THIS DOCUMENT IS A DRAFT CIRCULATED
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NATIONAL REGULATIONS.
ISO/DIS 17449:2014(E)
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NOTIFICATION OF ANY RELEVANT PATENT
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©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2014

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ISO/DIS 17449:2014(E)

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Road vehicles—Safety glazing materials –Test methods for performance of
electrically heated glazing

1. Scope

This International Standard provides the test methods for circuit continuity and heating power, driving
visibility, electrical attachment bond performance, electrical attachment bending performance, hot spot
identification and heating uniformity, defrosting efficiency, high voltage durability, low temperature
performance and long term humidity durability, for all electrically heated safety glazing materials in a
road vehicle. This standard provides test protocols for the static performance of an electrically heated
glazing material, it is not representative of in-vehicle performance.

2. Normative references

The following normative documents contain provisions which, through reference in this text, constitute
provisions of this International Standard. For dated references, subsequent amendments to, or revisions
of, any of these publications do not apply. However, parties to agreements based on this International
Standard are encouraged to investigate the possibility of applying the most recent editions of the
normative documents indicated below. For undated references, the latest edition of the normative
document referred to applies. Members of ISO and IEC maintain registers of currently valid International
Standards.
IEC 51-2 Direct acting indicating analogue electrical measuring instruments and their accessories
Parts 2 - Special requirements for ammeters and voltmeters
ISO 3538 Road vehicles —Safety glazing materials —Test methods for optical properties.
ISO 15082 Road vehicles —Tests for rigid plastic safety glazing materials
ECE R125       Uniform provisions concerning approval of motor vehicle with regards to the forwards
field of vision of the motor vehicle driver
3. Terms and definitions

For the purpose of this International Standard, the following definitions apply.

3.1 Heating evaluation area：
For Type 1 specified in 3.6, in absence of specific requirements and for a glazing equipped with heating
circuits formed by about evenly distanced conductive lines and bus bars near to the glass edges, the
heating evaluation area is represented by an area formed by the inner border of the bus bars and along
the heater lines by imaginary lines running outside and parallel to the outermost conductors at a
distance half of that to the next closest heating conductor. The size of this generated area is calculated
using CAD, see figure 1. For other specifically designed heaters with e.g. circular shaped heater, product
specification can be referenced for the heating evaluation area.
For Type 2 specified in 3.7 and Type 3 specified in 3.8, in absence of specific requirements, the heating
evaluation area refers to vision area specified in ECE R125.








Heating evaluation area





Key
1 Glass
2 Heating circuits
3 Electrical attachment
4 Bus bar
1
a/2 a b b/2

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Fig. 1, Heating evaluation area of Type 1

3.2 Electrical attachment：The components used for connecting to the vehicle power supply.

3.3 Defrosting: Elimination of frost or ice from the exterior of the glazing by heating at specified voltage.

3.4 Defrosting efficiency: A ratio of the melted area to the heating evaluation area after supplying
specified voltage for the specified period of time at specified ambient condition.

3.5 Hot spot: Any area on outer surface of the whole part that exceeds the maximum temperature
defined in the product specification after the part is supplied with specified voltage for the specified
heating time period at the specified ambient condition.

3.6 Type 1:Heater circuit consisting of conductors applied to the inside surface of a tempered or
laminated safety glass or a plastic safety glazing parts by means of a screen print, ink jet or other
method.

3.7 Type 2: Heater circuit consisting of discrete conductor lines applied to the inside of a laminated safety
glazing by incorporation of metal wires or any other suitable method.

3.8 Type 3: Heater circuit utilizing a transparent conductive film applied to one of the inner surfaces of a
laminated safety glazing.


4. Conditioning of test parts

Unless otherwise specified,  parts to be tested shall be conditioned prior to testing under the following
conditions and for at least 4 hours:
— Ambient temperature:        23℃ ± 2℃
—Atmospheric pressure: 86 kPa to 106 kPa (860 mbar to 1 060 mbar)
— Ambient relative humidity: (50±20)%

5. Specimens

Test specimens shall be production parts.

6. Application of test

For certain types of safety glazing material, it is not necessary to carry out all the tests specified in this
International Standard. Test items for a certain type of electrically heating glazing are suggested in Table
1.















2

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Table 1

Type
No. Test item Paragraph

1 2 3

Circuit continuity and heating
1 7.1 × × ×

power

2 Driving visibility 7.2 × × ×

Electrical attachment bond
3 7.3 × × ×

performance

Electrical attachment Bending
4 7.4 × － －

performance

Hot spot identification and
5 7.5
× × ×

heating uniformity

6 Defrosting efficiency 7.6
× × ×

High voltage durability
7 7.7 × × ×

Low temperature performance
8 7.8 × × ×

Long term humidity durability
9 7.9 － × ×

× Test required.

－ Test needs not be carried out.



7. Requirements

7.1 Circuit continuity and heating power

7.1.1 Purpose of test
The purpose of this test is to determine whether the heating system circuit has the correct continuity
between elements and heating power conforms to the product specification.

7.1.2 Apparatus
a) Variable direct current (DC) power supply, rated at a minimum of 1.5 times the voltage and 1.5 times
   the current specified for the parts to be tested.
b) Voltage meter, conforming to IEC 51-2, with an Accuracy Class of 1.
c) Ampere meter, conforming to IEC 51-2, with an Accuracy Class of 1.
d) Heat sensitive paper.
e ) Projector conforms to ISO 3538.
f) Thermal camera, with range 0 to 100°C, accuracy +/-0.5°C, can measure and record the tested area
with a spatial resolution of 2 mm.

7.1.3 Procedure
7.1.3.1 Circuit continuity
For Type 1 parts, supply the voltage defined in product specification to the electrical attachments of the
part. Lay heat sensitive paper across the heating wires. Optionally, use a thermal camera to check the
part after power is supplied.
For Type 2 parts, supply the voltage defined in product specification to the electrical attachments of the
part. Set the part vertically between the projector and a display screen. Light is projected through the
part to the display screen. Wires with light shadow on the screen are broken wires.
For Type 3 parts, supply the voltage defined in product specification to the electrical attachments of the
part, record value of ampere meter.
7.1.3.2 Heating power
In absence of special requirements, heating the part for 30 minutes, and read the electrical current value
shown on the ampere meter.
7.1.4  Expression of results
7.1.4.1 Circuit continuity
3

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For Type 1 parts, check the colour change in the paper or in thermal camera due to heat. Make
record of broken heating wires.
For Type 2 parts, check the shadow of the part on the screen. Make record of broken wire position on the
part.
For Type 3 parts, calculate the resistance according to the voltage measured at the attachments and the
corresponding current as measured in 7.1.3.2, and determine the continuity.
7.1.4.2 Heating power
Calculate the heating power according to the voltage measu
...