Insultube GMW and GHW are medium wall and heavy wall black tubing. GMW tubes 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. GHW tubes are used for mechanical protection and outer sealing of underground straight through cable joints / splice upto 36KV.
Technical Qualification Report : QR 1013
IEC, ASTM, AND MIL-SPEC
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 | 1.15 ± 0.2 gm/cm3 | ASTM D792 |
Hardness | 45 ± 10 Shore D | ASTM D2240 |
Water Absorption | 0.5 % (max.) | ASTM D570 |
Thermal | ||
Accelerated Ageing | (120oC for 500 Hrs) | ASTM D2671 |
Tensile Strength | 11 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 1014 Ohm.cm(min.) | ASTM D257 |
Dielectric Constant | 5 (Max.) | ASTM D150 |