1.  Shed connected with core by integral foring

2.  The thinkness of housing > 3mm,unifirm to IEC Standard

3.  Acid resistant,hight temperature resistant of epoxy fiberglass core

4.  Metal end fittings,core and sheds connected by new crimping process

5.  Hot galvanization and technology of rareearth aluminum coating to avoid coating        

     shedding prolonging the service life