MI cables are made in special manufacturing process taking a single or several heating alloy as the heating source, electric melting crystal magnesium oxide of high purity and high temperature as the thermal insulator and seamless stainless steel or copper tube as the sheath. PE sheath or that with low smoke and zero halogen can be added in the place exposed in strong corrosion.MI cables are of excellent mechanical strength and corrosion proof. MI heating cables with copper sheath can be used in the environment of high temperature and for long pipe transmission. as for those to be corrosion protected or buried underground, HDPE sheath (MIHC) shall be added, MI cables are of excellent mechanical strength.  MI heating cables with copper nickel alloy sheath.MI heating cables with copper nickel alloy sheath can be used in the environment of high temperature and for long pipe transmission.   MI cables are of excellent mechanical strength and corrosion proof.