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  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