|
Low
quality Spark plugs in the market |
Product
of AGA |
Insulators |
Common
products content of Al2O3
usually in 87~90% |
Content
of Al2O3
arrives 95% and forming by isostatic pressing¡É |
Metallic
Housing |
Processing by
instrumental lathe, dimension of screw no
meets a criterion, nickel surface has weak
antioxidation |
Processing by
cold forming, high precision, screw meets
a criterion,special nickel surface has strong
antioxidation |
Center-Electrode |
Low
content of nickel |
Alloy
Ni-Cr-Si |
Terminal |
Steel A3 |
Steel ML10 |
Seal
of finished products |
Weak
stability |
Good
stability by heating seal via heavy current |
Printing |
Over-glaze decoration |
Under-glaze decoration |
Side
electrode |
Inferior
material |
Quality
material |
Sealant |
Al powder glass,Heat-unresisting |
Cu powder glass,same
with BOSCH's |
Inner
sealing process |
Heating
terminal by high frequency,weak cohesion |
Heating
terminal with sealant in high temperature
oven, strong cohesion |
Marking
housing |
By twisting |
By rolling |
Dielectric
strength |
No
test |
Test
by 25~35kv |
Appearance |
Crude |
Exquisite |