Red Insulation Tube (INSULTUBE Red)
INSULTUBE Red is a heat-shrinkable, cross-linked polyolefin insulation tube used in power cable joints for medium-voltage applications, offered in standard, Heavy Wall and Extra Heavy Wall selection charts with customised dimensions on request.
- IEC 60684-3-247
Choose a size
Selection Charts
- D min.
- Minimum internal diameter as supplied
- d max.
- Maximum internal diameter after free recovery
- T
- Recovered wall thickness (±10 %)
| Code | D min.(mm) | d max.(mm) | T ±10%(mm) |
|---|---|---|---|
| GRT 30/8 | 30 | 8 | 2.6 |
| GRT 33/10 | 33 | 10 | 2.6 |
| GRT 40/12 | 40 | 12 | 2.7 |
| GRT 50/16 | 50 | 16 | 2.7 |
| GRT 70/22 | 70 | 22 | 2.7 |
| GRT 95/25 | 95 | 25 | 3.0 |
| GRT 105/30 | 105 | 30 | 3.0 |
| GRT 115/34 | 115 | 34 | 3.2 |
| GRT 130/36 | 130 | 36 | 3.2 |
Source: GALA INSULTUBE Red Insulation Tube catalogue sheet, Issue 2, January 2024.
GRT(HW) heavy wall selection chart
| Code | D min.(mm) | d max.(mm) | T ±10%(mm) |
|---|---|---|---|
| GRT(HW) 30/8 | 30 | 8 | 3.0 |
| GRT(HW) 33/10 | 33 | 10 | 3.0 |
| GRT(HW) 40/12 | 40 | 12 | 4.0 |
| GRT(HW) 50/16 | 50 | 16 | 4.0 |
| GRT(HW) 70/22 | 70 | 22 | 4.0 |
| GRT(HW) 95/25 | 95 | 25 | 4.0 |
| GRT(HW) 105/30 | 105 | 30 | 4.0 |
| GRT(HW) 115/34 | 115 | 34 | 4.0 |
| GRT(HW) 130/36 | 130 | 36 | 4.0 |
Source: GALA INSULTUBE Red Insulation Tube catalogue sheet, Issue 2, January 2024.
GRT(EHW) extra heavy wall selection chart
| Code | D min.(mm) | d max.(mm) | T ±10%(mm) |
|---|---|---|---|
| GRT(EHW) 50/16 | 50 | 16 | 6.2 |
| GRT(EHW) 70/22 | 70 | 22 | 6.2 |
| GRT(EHW) 95/25 | 95 | 25 | 6.2 |
| GRT(EHW) 105/30 | 105 | 30 | 6.2 |
| GRT(EHW) 115/34 | 115 | 34 | 6.2 |
| GRT(EHW) 130/36 | 130 | 36 | 6.2 |
Source: GALA INSULTUBE Red Insulation Tube catalogue sheet, Issue 2, January 2024.
Material properties
Technical Specification
| Properties | Value | Standard |
|---|---|---|
| Physical | ||
| Tensile Strength | 12 N/mm²(Mpa) (min.) | ASTM D638 |
| Ultimate Elongation | 300 % (min) | ASTM D638 |
| Longitudinal Change | -10 % (max.) | ASTM D2671 |
| Hardness | 45 ±10 Shore D | ASTM D2240 |
| Water absorption | 0.2 % (max.) | ASTM D570 |
| Thermal | ||
| Accelerated ageing | (120 °C for 500 hrs) | ASTM D2671 |
| Tensile Strength | 11 N/mm²(Mpa) (min.) | ASTM D638 |
| Ultimate Elongation | 250 % (min.) | ASTM D638 |
| Low Temperature Flexibility (-40 °C for 4 hrs.) | No Cracking | ASTM D2671 |
| Heat Shock (250 °C for 30 min.) | No cracking or flowing | ASTM D2671 |
| Shrink Temperature | 125 °C | IEC 216 |
| Continuous Temperature Limit | -40 to +110 °C | |
| Electrical | ||
| Dielectric constant | 5 (max.) | ASTM D150 |
Source: GALA INSULTUBE Red Insulation Tube catalogue sheet, Issue 2, January 2024.
Dimensions & Drawings
INSULTUBE Red insulates power cable joints for MV applications, in cross-linked polyolefin, across standard, Heavy Wall and Extra Heavy Wall selection charts. Halogen free and RoHS compliant; custom dimensions, thickness, length and colour are available on request.
Covered on this page
- Heat Shrinkable Tubes/Heat Shrink Sleeves
- Red Insulation Tubes - INSULTUBE red
Features & Benefits
- Cross-linked polyolefin material
- GRT series with standard, Heavy Wall and Extra Heavy Wall selection charts
- Customised dimensions, thickness, length and colours available on request
Applications
- Insulation in power cable joints for medium voltage applications
Standards & Compliance
- IEC 60684-3-247
FAQs
Frequently Asked Questions
What is the Red Insulation Tube used for?
It is used for:
- Insulation in power cable joints for medium voltage applications
How do I choose the right size?
A heat-shrink part is chosen by two diameters. As supplied (D min. (mm)) it must open wider than the largest thing it has to slide over; after shrinking (d max. (mm)) it must close smaller than the smallest thing it has to grip. Measure both on your cable or busbar and pick the first code in the selection chart that satisfies both.
How is it installed?
Clean and degrease the surface, position the part, then shrink it with a gas torch or a hot-air gun: keep the heat moving round it with a smooth, brushing motion so it recovers evenly without scorching. Start at one end and work steadily along to the other.
Which standards and test methods are quoted for it?
These, with the values in the Technical Specification on this page:
- IEC 60684-3-247
Where can I download the datasheet?
From the "Download datasheet" button at the top of this page, or here:
Can I get a quote, a sample or a size that is not listed?
Send your cable details, quantity and application with the "Request a Quote or Sample" form at the foot of this page. For a size or variant that is not in the chart, describe what you need there, or use Technical support at the top of the page, and the technical team will confirm what can be supplied.
47+
Years manufacturing
100+
Countries served
140
Products in range
ISO 9001:2015
Certified & tested