JC/T 673-1997 English PDF (JCT673-1997)

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JC/T 673-1997: Performance test method for electric heating glass of rear auto window
JC/T 673-1997
JC
BUILDING MATERIAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Performance test method for electric heating glass of rear
auto window
ISSUED ON: AUGUST 05, 1997
IMPLEMENTED ON: JANUARY 01, 1998
Issued by: State Bureau of Building Materials Industry
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms ... 4
4 Specimens ... 5
5 Environmental conditions ... 6
6 Transmittance test ... 6
7 Opacity test ... 6
8 Cleaning agent resistance test ... 7
9 Welding strength test of electric inserts ... 7
10 Bending resistance test of electrical inserts ... 8
11 Power test ... 8
12 Defrost efficiency test ... 9
13 Over-voltage test ... 11
14 Hot spot temperature test ... 13
15 Electrothermal shock resistance test ... 15
16 Salt spray resistance test ... 16
17 Abrasion resistance test of electric heating wire ... 19
18 Moisture resistance test ... 21
19 Durability test ... 22
20 Impact resistance test ... 23
21 Fragment state test ... 23
Performance test method for electric heating glass of rear
auto window
1 Scope
This standard specifies the test methods of transmittance, opacity, resistance to cleaning
agents, welding strength of electric inserts, bending resistance of electric inserts, power,
defrosting efficiency, over-voltage, hot spot temperature, resistance to electric thermal
shock, salt spray resistance, heating wire abrasion resistance, moisture resistance,
durability, impact resistance, fragmentation state. It is applicable to performance
inspection and design verification of various types of automotive electric heating glass.
2 Normative references
The provisions contained in the following standards constitute the provisions of this
standard, through reference in this standard. At the time of publication, the editions
indicated were valid. All standards are subject to revision; parties using this standard
shall explore the possibility of using the latest editions of the standards listed below.
GB 776-76 General specifications for electrical measuring and indicating
instruments
JC/T 632-1996 Road vehicles - safety glazing materials - Terminology
GB 5137.1-1996 Road vehicles - Safety glazing materials - Test methods for
mechanical properties
GB 5137.2-1996 Road vehicles - Safety glasses - Test methods for optical properties
3 Terms
3.1 Opacity
The ratio -- of the opaque area on the electric heating glass caused by the electric heating
wire TO the area of the entire heating zone.
3.2 Heating zone
A closed surface, which is framed by the uppermost electric heating wire, the lowermost
electric heating wire, a bus bar on the left and right.
3.3 Electric insert
A metal sheet, which is welded on the electric heating glass's bus bar AND connected
to the power supply.
3.4 Defrosting efficiency
Under the application of a certain voltage, the melting percentage of the frost layer on
the surface of the electric heating glass, within a specified time.
3.5 Over-voltage
The ability of electric heating glass to withstand the voltage, which is greater than the
rated voltage.
3.6 Hot spot temperature
The highest temperature point on the surface of the electric heating wire or bus bar,
during the electric heating process of the electric heating glass.
3.7 Electrical shock resistance
The ability of electric heating glass to withstand electric heating under low temperature
conditions.
3.8 Salt spray resistance
The ability of electric heating glass to withstand salt spray corrosion, in a salt spray
environment.
3.9 Heating wire abrasion resistance
The ability of the electric heating wire on the surface of the electric heating glass, to
withstand the abrasion from cotton yarn and the like.
3.10 Durability
The ability of electric heating glass to withstand the heating, after repeated power-on
for a long time.
Other terms, which appear in this standard, are in accordance with the provisions of
JC/T 632.
4 Specimens
Unless otherwise specified, the specimens used in this standard are all finished
automobile electric heating glass. If a small specimen is used, it must be made of the
Where:
TS - Opacity, %;
S1 - The area of the specimen heating zone, cm2;
S2 - The total area of the specimen heating wire, cm2.
8 Cleaning agent resistance test
8.1 Purpose of the test
Check whether the heating power of automobile electric heating glass still meets the
requirements of corresponding product technical conditions, after being cleaned by
glass cleaning agent.
8.2 Cleaning agent
50% ethanol solution (water: absolute ethanol = 1:1).
8.3 Test procedure
Continuously soak the absorbent cotton with cleaning agent. Squeeze and scrub the
heating wire of the specimen repeatedly for 2 minutes. Then use the absorbent cotton
to wipe dry the cleaning agent on the specimen.
8.4 Results presentation
After the specimen is scrubbed with cleaning agent, judge the resistance to cleaning
agent, by whether the heating wire is loose or the heating device falls off.
9 Welding strength test of electric inserts
9.1 Purpose of the test
Determine whether the welding strength -- between the electric heating glass insert of
the automobile and the glass plate -- meets the requirements of the corresponding
product technical conditions, under the action of a certain mechanical force.
9.2 Test apparatus
a) Weight, which is a heavy object with lead particles in a cloth bag. Its weight shall
be determined according to the tensile force required for the test. The weight error
shall not be greater than ±10 g;
b) Stopwatch;
c) Specimen support frame.
9.3 Test procedure
Fix the specimen horizontally on the support frame. Hang it on the electric plug, using
the weight which is required for the test. Use a stopwatch to record the time at the same
time. When the time required for the test is reached, stop the test (other equivalent test
methods can also be used). If the electric insert falls off the glass plate within the time
required for the test, it shall record the time when it falls off.
9.4 Result presentation
The tensile force, which is withstood by the electric insert on the specimen within a
certain period of time, is used to represent the welding strength of the electric insert of
the electric heating glass of the automobile.
10 Bending resistance test of electrical inserts
10.1 Purpose of the test
Determine whether the bending resistance and the welding strength with the glass plate
of the electric heating glass's electric insert of the automobile can meet the requirements
of the corresponding product technical conditions, after being subjected to a certain
number of specified bending actions.
10.2 Test procedure
Bend the electric insert 120° ± 10°, according to the number of bends required for the
test. Check whether the electric insert is cracked. Meanwhile record whether the electric
insert breaks or falls off the glass plate, during the test.
10.3 Results presentation
The bending resistance of the electric heating glass's electric insert of the automobile is
expressed by the damage degree of the electric insert, after a specified number of bends,
AND the welding strength with the glass plate.
11 Power test
11.1 Purpose of the test
Determine whether the heating power of the automotive electric heating glass meets the
requirements of the corresponding produc...