Heat Shrink Right Angle Boot & Straight Boot
Cross-linked polyolefin boots that insulate cable termination bushings against flashover where phase-to-phase and phase-to-earth clearances are reduced, in Right Angle (GRB) and Straight (GSB) profiles.
- Dielectric strength 15 kV/mm minimum
- ASTM D638
- ASTM D792
- ASTM D2240
Choose a size
Selection Charts
- D, d
- Internal diameter (D the bushing end, d the cable end)
- s
- As supplied
- f
- After free recovery
- P, R
- Leg lengths of the right angle boot, as drawn on the sheet
- A, B, L
- Wide-section length, narrow-end length and overall length of the straight boot
- T
- Wall thickness (±10%)
| Code | Ds(min.) | Df(max.) | ds(min.) | df(max.) | Ps(min.) | Rf(min.) | Tf(±10%) |
|---|---|---|---|---|---|---|---|
| GRB-1 | 78 | 35 | 34 | 16 | 160 | 130 | 4.0 |
| GRB-2 | 78 | 37 | 52 | 27 | 170 | 140 | 4.5 |
| GRB-2A | 90 | 37 | 67 | 27 | 170 | 140 | 4.5 |
| GRB-3 | 145 | 72 | 67 | 34 | 170 | 150 | 4.5 |
D, d: internal diameter; s: as supplied; f: after free recovery. Source: GALA ANGLEBOOT catalogue sheet, Issue 2, January 2024.
Straight boots (GSB), Part II
| Code | Ds(min.) | Df(max.) | ds(min.) | df(max.) | Af(min.) | Lf(min.) | Bf(min.) | Tf(±10%) |
|---|---|---|---|---|---|---|---|---|
| GSB-1 | 80 | 34 | 34 | 21 | 140 | 225 | 30 | 3.6 |
| GSB-2 | 80 | 35 | 57 | 22 | 140 | 225 | 30 | 3.6 |
| GSB-2A | 100 | 36 | 57 | 22 | 140 | 225 | 30 | 3.6 |
| GSB-3 | 140 | 65 | 90 | 33 | 155 | 250 | 40 | 4.0 |
D, d: internal diameter; s: as supplied; f: after free recovery. Source: GALA ANGLEBOOT 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 | 350 % (min) | ASTM D638 |
| 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 | (120 °C for 500 hrs) | ASTM D2671 |
| Tensile Strength | 11 N/mm² (Mpa) (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 +100 °C | IEC 216 |
| Electrical | ||
| Dielectric Strength | 15 KV/mm (min) | ASTM D149 |
| Volume Resistivity | 1 x 10¹⁴ Ohm.cm (min) | ASTM D257 |
| Dielectric constant | 5 (max.) | ASTM D150 |
| Resistant to track & erosion | No Tracking, erosion or flame failure upto 3.25 KV for 20 min. | ASTM D2303 |
Source: GALA ANGLEBOOT catalogue sheet, Issue 2, January 2024.
Dimensions & Drawings
Right Angle and Straight Boots insulate the bushings inside a cable termination box where phase-to-phase and phase-to-earth clearance is tighter than normal air clearance, guarding against flashover from high humidity, rodents and surge impulse.
Moulded from cross-linked, non-tracking polyolefin and internally coated with water-resistant red mastic.
Covered on this page
- Right Angle Boot/Straight Boot - ANGLEBOOT
Features & Benefits
- Cross-linked, non-tracking polyolefin material
- Internally coated with water-resistant red mastic
- Right Angle Boot in four sizes: GRB-1, GRB-2, GRB-2A, GRB-3
- Straight Boot in four sizes: GSB-1, GSB-2, GSB-2A, GSB-3
- Continuous operating temperature -40°C to +110°C
- Shrink temperature 125°C
- Dielectric strength 15 kV/mm minimum
- Resistant to tracking and erosion up to 3.25 kV for 20 minutes
Applications
- Insulating bushings inside cable termination boxes where phase-to-phase and phase-to-earth clearance is less than normal air clearance
- Protection against flashover under high humidity
- Protection against rodent damage
- Protection against surge impulse
Standards & Compliance
- ASTM D638
- ASTM D792
- ASTM D2240
- ASTM D570
- ASTM D2671
- ESI 09-11
- IEC 216
- ASTM D149
- ASTM D257
- ASTM D150
- ASTM D2303
FAQs
Frequently Asked Questions
What is the Heat Shrink Right Angle Boot & Straight Boot used for?
It is used for:
- Insulating bushings inside cable termination boxes where phase-to-phase and phase-to-earth clearance is less than normal air clearance
- Protection against flashover under high humidity
- Protection against rodent damage
- Protection against surge impulse
How do I choose the right size?
A heat-shrink part is chosen by two diameters. As supplied (Ds (min.)) it must open wider than the largest thing it has to slide over; after shrinking (Df (max.)) 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:
- ASTM D638
- ASTM D792
- ASTM D2240
- 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.
47+
Years manufacturing
100+
Countries served
140
Products in range
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