1 Scope
This standard specifies the test methods for transmittance, opacity rate, resistance to cleaning agent, welding strength of electric insert, bending resistance of electric insert, power, defrosting efficiency, overvoltage resistance, hot spot temperature, electrothermal impact resistance, salt spray resistance, wear resistance of electric heating wire, moisture resistance, durability, impact resistance and fragment state of electric heating glass for automobile rear windshield, and is applicable to performance testing and design verification of various types of automobile electric heating glass.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, all editions cited are valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
GB 776-76 Electrical indicating measuring instruments—General specification
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 rate
ratio of the opaque area caused by electric heating wire to the area of the entire heating zone on the electric heating glass
3.2
heating zone
a closed surface formed by the topmost and the nethermost electric heating wires and one of the left and right bus bars respectively
3.3
electric insert
a metal sheet that is welded to the bus bar of the electric heating glass and connected to power supply
Foreword i
1 Scope
2 Normative references
3 Terms
4 Samples
5 Environmental conditions
6 Transmittance test
7 Opacity rate test
8 Resistance test to cleaning agent
9 Welding strength test of electric insert
10 Bending resistance test of electric insert
11 Power test
12 Defrosting efficiency test
13 Overvoltage resistance test
14 Hot spot temperature test
15 Electrothermal impact resistance test
16 Salt spray resistance test
17 Wear resistance test of electric heating wire
18 Moisture resistance test
19 Durability test
20 Impact resistance test
21 Fragment state test
