Insultube is Heat shrink Medium & Heavy wall tubing.
Medium wall tubes (GMW) are used for environmental protection of low voltage cable
termination and insulating the connectors for low
voltage straight through joints / splice rated upto 3.3kV. Heavy wall
tubes (GHW) are used for mechanical protection and outer sealing of
underground straight through cable joints / splice upto 36kV.
These tubes are manufactured from high quality cross inked
polyolefin material.
Technical Qualification Report : QR 1013
All dimensions are in mm
Properties | Value | Standard |
---|---|---|
Physical | ||
Tensile Strength | 12 N/mm2 (MPA)(min.) | ASTM D638 |
Ultimate Elongation | 350% (Min.) | ASTM D638 |
Longitudinal Change | -10% (Max.) | ASTM D2671 |
Density | 1.0 ± 0.2 gm/cm3 | ASTM D792 |
Hardness | 45 ± 10 Shore D | ASTM D2240 |
Water Absorption | 0.5 % (max.) | ASTM D570 |
Thermal | ||
Accelerated Ageing | (150oC for 168 hrs.) | ASTM D2671 |
Tensile Strength | 12 N/mm2 (Mpa) (min.) | ASTM D 638 |
Low temperature Flexibility (-40oC for 4 Hrs.) | No Cracking | ASTM D2671 |
Heat Shock (250oC for 30 Min.) | No Cracking or flowing | ESI 09-11 |
Shrink Temperature | 125oC | IEC 216 |
Continuous Temperature limit | -40oC to + 110oC | IEC 216 |
Electrical | ||
Dielectric Strength | 12 KV/mm. (Min.) | ASTM D149 |
Volume Resistivity | 1 x 1012 Ohm.cm(min.) | ASTM D257 |
Dielectric Constant | 5 (Max.) | ASTM D150 |
Weathering: The material from which Medium and Heavy wall tubings are manufactured contains carbon black to protect it from UV light. |