CPVC Pipes for High Tension Cable Protection Plastics Pipes for nderground Correspondence ◆High compression resistance. ◆Impact Strength resistance. ◆High wreath steel degree ◆High temperature resistance ◆Well flame retardant property:extinguish while being depared from the fire ◆Well insulation property:bear high tension without breakdown. ◆Little frictional coefficient,easy drag cable yarn ◆Convenient construction,capital saving. ◆It is applicable for power net reconstruction,municipal construcion,etc.It is the necessary supported product of cable burying. ◆Be applicable to the outdoors correspondence electric cable with the fiber optic cable with piping system Vicat softening temperature ≥93℃ Wreath a hot compression dint Wall thickness 5.0～＜8.0  ≥8.0 ≥0.45KN  ≥1.26KN Lognitudinal reversion rate ≤5% Volum rsistirity ≥1.0×1011Ω·cm Falling weight impact test 9/10No break QB/T2479-2000 ln (mm) Nominal outside diameter 110 139 167 167 192 192 219 219 Nominal wall thickness 5.0 6.0 6.0 8.0 6.5 8.5 7.0 9.5 (℃)Falling weight impact 9/10No break Wreath just degree（kN/m2） ≥6.3 Flatting test No break Coefficient of frication 干放≤0.363　施加膨润土≤0.155 Connection seal test No break YD/T841-1996 ln (mm) Nominal outside diameter 110/100 100/90 75/65 63/54 50/41