Heat Shrink Medium / Heavy Wall Tubes
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.
Features
- Optional hot melt adhesive for complete environmental protection and insulation, according to IP 68 (Ingress Protection.)
- Conforms to IEC 60684-3-247 standard.
- Halogen Free.
- Excellent resistance to weathering, UV rays, chemical and solvents.
- Custom dimensions, thickness, length & colours available on request.
- The maximum available cut length for GMW/GHW varies based on sizes: upto 250/70-1200mm; up to 320/90-1000mm; above 375/110-500mm.
Diagram
Selection Chart
| Code | D Min. (mm) | d Max. (mm) | T ±10% (mm) |
|---|---|---|---|
| GMW 10/3 | 10 | 3 | 1.5 |
| GMW 12/4 | 12 | 4 | 1.8 |
| GMW 16/5* | 16 | 5 | 2.0 |
| GMW 19/6 | 19 | 6 | 2.0 |
| GMW 22/6 | 22 | 6 | 2.3 |
| GMW 25/8 | 25 | 8 | 2.5 |
| GMW 30/8 | 30 | 8 | 2.6 |
| GMW 33/10* | 33 | 10 | 2.6 |
| GMW 40/12 | 40 | 12 | 2.7 |
| GMW 50/16 | 50 | 16 | 2.7 |
| GMW 65/19* | 65 | 19 | 2.7 |
| GMW 70/22* | 70 | 22 | 2.7 |
| GMW 75/22 | 75 | 22 | 2.7 |
| GMW 95/25* | 95 | 25 | 3.0 |
| GMW 105/30 | 105 | 30 | 3.0 |
| GMW 115/34 | 115 | 34 | 3.2 |
| GMW 130/36 | 130 | 36 | 3.2 |
| GMW 140/42 | 140 | 42 | 3.2 |
| GMW 160/50 | 160 | 50 | 3.3 |
| GMW 180/55 | 180 | 55 | 3.3 |
| GMW 200/60 | 200 | 60 | 3.5 |
| GMW 250/70 | 250 | 70 | 3.5 |
| GMW 320/90 | 320 | 90 | 3.5 |
| GMW 375/110 | 375 | 110 | 3.5 |
| GMW 425/120 | 425 | 120 | 3.5 |
| Code | D Min. (mm) | d Max. (mm) | T ±10% (mm) |
|---|---|---|---|
| GHW 12/3 | 12 | 3 | 2.4 |
| GHW 19/6 | 19 | 6 | 2.5 |
| GHW 22/6 | 22 | 6 | 2.7 |
| GHW 25/8 | 25 | 8 | 2.8 |
| GHW 30/8 | 30 | 8 | 3.0 |
| GHW 33/10* | 33 | 10 | 3.0 |
| GHW 40/12 | 40 | 12 | 4.0 |
| GHW 50/16* | 50 | 16 | 4.0 |
| GHW 65/19* | 65 | 19 | 4.0 |
| GHW 70/22* | 70 | 22 | 4.0 |
| GHW 75/22 | 75 | 22 | 4.0 |
| GHW 95/25* | 95 | 25 | 4.0 |
| GHW 105/30 | 105 | 30 | 4.0 |
| GHW 115/34* | 115 | 34 | 4.0 |
| GHW 130/36* | 130 | 36 | 4.0 |
| GHW 140/42 | 140 | 42 | 4.2 |
| GHW 160/50 | 160 | 50 | 4.3 |
| GHW 180/55 | 180 | 55 | 4.3 |
| GHW 200/60 | 200 | 60 | 4.3 |
| GHW 250/70 | 250 | 70 | 4.3 |
| GHW 320/90 | 320 | 90 | 4.5 |
| GHW 375/110 | 375 | 110 | 4.5 |
| GHW 425/120 | 425 | 120 | 4.5 |
Technical Specification
| 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 | (150°C for 168 hrs) | ASTM D2671 | |
| Tensile Strength | 10 N/mm² (Mpa) (min.) | ASTM D638 | |
| Ultimate Elongation | 300 % (min.) | ASTM D638 | |
| Low Temperature Flexibility (-40 0 C for 4 hrs.) | No Cracking | ASTM D2671 | |
| Heat Shock (250°C for 30 min.) | No cracking or flowing | ESI 09-11 | |
| Shrink Temperature | 125°C | IEC 216 | |
| Continuous Temperature Limit | -40 to +100°C | 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.
Certificates
FAQs
1. What is a Heat Shrink Shroud?
A Heat Shrink Shroud is a protective sleeve made from cross-linked polymer material that shrinks when heat is applied. It provides insulation, sealing, and mechanical protection for cables, joints, and terminations.
2. How does a Heat Shrink Shroud work?
When heat is applied using a heat gun or torch, the shroud shrinks uniformly and tightly wraps around the cable or joint, creating a secure and sealed covering.
When heat is applied using a heat gun or torch, the shroud shrinks uniformly and tightly wraps around the cable or joint, creating a secure and sealed covering.
3. What material is Heat Shrink Shroud made of?
It is typically made from cross-linked polyolefin material, often containing carbon black for UV resistance and weather protection.
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