De-Gassing End Cap with Relief Valve (Insulcap RV)
Insulcap-De-gassing (RV) is a heat shrinkable end cap fitted with a relief valve, used to seal high-voltage and extra-high-voltage cable ends (33 kV and above) while releasing gas that builds up inside the cable during transport and storage in hot climates.
- Meets IP68 Ingress Protection
- ASTM D638
- ASTM D570
- ASTM D2671
Choose a size
Selection Chart
- Ds (min.)
- Minimum internal diameter as supplied
- Df (max.)
- Maximum internal diameter after free recovery
- Ls (min.)
- Minimum length as supplied
- Tf
- Wall thickness after recovery (±10%)
- Cable range
- Cable outside diameter the cap fits
| Code No. | Ds(min.) | Df(max.) | Ls(min.) | Tf(±10%) | Cable range |
|---|---|---|---|---|---|
| GEC 102 RV | 30 | 11 | 75 | 2.5 | 12 - 26 |
| GEC 201 RV | 40 | 15 | 90 | 3.3 | 16 - 35 |
| GEC 201 L RV | 40 | 15 | 120 | 3.3 | 16 - 35 |
| GEC 301 RV | 55 | 25 | 125 | 3.8 | 25 - 47 |
| GEC 301 L RV | 55 | 25 | 170 | 3.8 | 25 - 47 |
| GEC 401 RV | 75 | 35 | 140 | 4.0 | 35 - 68 |
| GEC 401 L RV | 75 | 35 | 180 | 4.0 | 35 - 68 |
| GEC 501 RV | 100 | 45 | 160 | 4.0 | 45 - 90 |
| GEC 501 L RV | 100 | 45 | 200 | 4.0 | 45 - 90 |
| GEC 601 RV | 130 | 60 | 160 | 4.6 | 64 - 120 |
| GEC 601 L RV | 130 | 65 | 300 | 4.6 | 67 - 120 |
| GEC 701 RV | 154 | 60 | 165 | 4.6 | 72 - 145 |
| GEC 701 L RV | 154 | 65 | 300 | 4.6 | 70 - 145 |
| GEC 801 RV | 230 | 125 | 220 | 4.0 | 140 - 200 |
D: internal diameter; s: as supplied; f: after free recovery. Source: GALA INSULCAP De-gassing End Cap catalogue sheet, Issue 2, January 2026.
Material properties
Technical Specification
| Properties | Value | Standard |
|---|---|---|
| Physical | ||
| Tensile Strength | 12 N/mm² (Mpa) (min.) | ASTM D638 |
| Ultimate Elongation | 350% (min.) | ASTM D638 |
| 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 | 300% (min.) | ASTM D638 |
| Heat Shock (250 °C for 30 min.) | No cracking or flowing | ESI 09-11 |
| Continuous Temperature Limit | -40 °C to +100 °C | 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 |
Source: GALA INSULCAP De-gassing End Cap catalogue sheet, Issue 2, January 2026.
Dimensions & Drawings
Insulcap-De-gassing (RV) is a Heat Shrinkable End Cap supplied with a relief valve (RV), used for sealing High Voltage and Extra High Voltage cables (33 kV and above) to release gas that continually evolves inside the cable during transportation and storage in hot climate conditions.
Covered on this page
- Cable End Caps - De gasing End Caps
- Working of pressure relief valve
Features & Benefits
- Meets IP68 Ingress Protection
- Relief valve automatically releases gas above 3 psi
- Non-returnable valve keeps moisture, water and dirt out of the cable
- Reduces required de-gassing (heating) chamber time
- Each relief valve is factory tested for gas release
- Eliminates fire risk from trapped methane when removing a non-relief-valved end cap
- GEC 102 RV to GEC 801 RV size range, cable range 12-200 mm
- Dielectric strength 12 kV/mm min., volume resistivity 1×10¹⁴ Ohm.cm min. (ASTM D149, ASTM D257)
- Continuous temperature limit -40°C to +110°C (IEC 216)
Applications
- Sealing HV and EHV cable ends (33 kV and above) during transport and storage
- Releasing residual cable gas in hot climate conditions
Standards & Compliance
- ASTM D638
- ASTM D570
- ASTM D2671
- ESI 09-11
- IEC 216
- ASTM D149
- ASTM D257
- ASTM D150
FAQs
Frequently Asked Questions
What is the De-Gassing End Cap with Relief Valve used for?
It is used for:
- Sealing HV and EHV cable ends (33 kV and above) during transport and storage
- Releasing residual cable gas in hot climate conditions
How do I choose the right size?
Measure the outside diameter of the cable and choose the code whose "Cable range" covers it. For example, GEC 501 RV fits a cable of 45–90 mm. Where two ranges overlap, either code fits.
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:
- ASTM D638
- ASTM D570
- ASTM D2671
- ESI 09-11
- IEC 216
- ASTM D149
- ASTM D257
- ASTM D150
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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