Stress Control Tube (Insultube-Stress)
Insultube-Stress is manufactured from radiation cross-linked polymeric material, engineered to control high electrical stress present at insulation-screen terminals and power cable joints up to 36 kV.
- Power cable joints up to 36 kV
- ASTM D638
- ASTM D2671
- ASTM D2240
Choose a size
Selection Chart
- 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) |
|---|---|---|---|
| GST 30/12 | 30 | 12 | 2.3 |
| GST 40/18 | 40 | 18 | 2.4 |
| GST 50/20 | 50 | 20 | 2.4 |
| GST 60/25 | 60 | 25 | 2.4 |
Standard colour: black. Minimum shrink temperature 100 °C; minimum fully shrink temperature 130 °C. Source: GALA Insultube Stress Control Tube catalogue sheet, Issue 2, January 2024.
Material properties
Technical Specification
| Properties | Value | Standard |
|---|---|---|
| Physical | ||
| Tensile Strength | 12 Mpa (N/mm²) (min.) | ASTM D638 |
| Ultimate Elongation | 350 % (min) | ASTM D638 |
| Longitudinal Change | -10% (max.) | ASTM D2671 |
| Hardness | 45 ±3 Shore D | ASTM D2240 |
| Water absorption | 1 % (max.) | ASTM D570 |
| Thermal | ||
| Accelerated ageing | (120 °C for 500 hrs) | ASTM D2671 |
| Tensile Strength | 10 Mpa (N/mm²) (min.) | ASTM D638 |
| Ultimate Elongation | 300 % (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 | ESI 09-11 |
| Shrink Temperature | 125 °C | IEC 216 |
| Continuous Temperature Limit | -40 to +110 °C | IEC 216 |
| Electrical | ||
| Volume Resistivity | 1 x 10⁷ Ohm.cm (min) | ASTM D257 |
| Dielectric constant | 15 (min.) | ASTM D150 |
Source: GALA Insultube Stress Control Tube catalogue sheet, Issue 2, January 2024.
Dimensions & Drawings
A specially formulated radiation cross-linked polymeric material that controls high electrical stress at insulation-screen terminals and power cable joints up to 36 kV.
Covered on this page
- Heat Shrinkable Tubes/Heat Shrink Sleeves
- Stress Control Tube
Features & Benefits
- Radiation cross-linked polymeric material
- Operating temperature -40°C to 100°C
- Minimum shrink temperature 100°C, fully shrunk at 130°C
- Standard colour black
Applications
- Controlling electrical stress at insulation screen terminals
- Power cable joints up to 36 kV
Standards & Compliance
- ASTM D638
- ASTM D2671
- ASTM D2240
FAQs
Frequently Asked Questions
What is the Stress Control Tube used for?
It is used for:
- Controlling electrical stress at insulation screen terminals
- Power cable joints up to 36 kV
How do I choose the right size?
Use the selection chart on this page: it lists every code with its dimensions, and the key above it says what each column means. If you are not sure which fits, send the dimensions you are working to with the form below.
Which standards and test methods are quoted for it?
These, with the values in the Technical Specification on this page:
- ASTM D638
- ASTM D2671
- ASTM D2240
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.
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Years manufacturing
100+
Countries served
140
Products in range
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