Heat Shrinkable Thin Wall Tubes (GSC & GDW)
Two thin-wall heat shrink tube ranges: flame-retardant GSC tubing for general insulation, and GDW dual-wall tubing that co-extrudes polyolefin with a hot-melt adhesive for combined insulation and sealing.
More datasheets
Full dimensional specifications and technical data, ready to download.
Choose a size
Selection Charts
| Part number / size | Supplied I.D.(mm) | Recovered I.D.(mm) | Recovered wall thickness(mm) | Spools(m / spool) | Cut length 1.2 m(per box) |
|---|---|---|---|---|---|
| GSC 1.0/0.5 | 1.0 | 0.5 | 0.28 | 400 | 600 |
| GSC 1.5/0.75 | 1.5 | 0.75 | 0.32 | 400 | 600 |
| GSC 2.0/1.0 | 2.0 | 1.0 | 0.35 | 400 | 600 |
| GSC 2.5/1.2 | 2.5 | 1.2 | 0.44 | 400 | 600 |
| GSC 3.0/1.5 | 3.0 | 1.5 | 0.44 | 400 | 500 |
| GSC 4.0/2.0 | 4.0 | 2.0 | 0.44 | 400 | 250 |
| GSC 5.0/2.5 | 5.0 | 2.5 | 0.56 | 200 | 250 |
| GSC 6.0/3.0 | 6.0 | 3.0 | 0.56 | 200 | 200 |
| GSC 7.0/3.5 | 7.0 | 3.5 | 0.56 | 100 | 200 |
| GSC 8.0/4.0 | 8.0 | 4.0 | 0.56 | 100 | 175 |
| GSC 10.0/5.0 | 10.0 | 5.0 | 0.56 | 100 | 150 |
| GSC 12.7/6.35 | 12.7 | 6.35 | 0.56 | 100 | 120 |
| GSC 14.0/7.0 | 14.0 | 7.0 | 0.69 | 100 | 100 |
| GSC 16.0/8.0 | 16.0 | 8.0 | 0.69 | 100 | 100 |
| GSC 18.0/9.0 | 18.0 | 9.0 | 0.69 | 100 | 80 |
| GSC 20.0/10.0 | 20.0 | 10.0 | 0.78 | 100 | 65 |
| GSC 25.0/12.5 | 25.0 | 12.5 | 0.78 | 50 | 40 |
| GSC 30.0/15.0 | 30.0 | 15.0 | 0.87 | 50 | 30 |
| GSC 40.0/20.0 | 40.0 | 20.0 | 0.97 | 50 | 20 |
| GSC 50.0/25.0 | 50.0 | 25.0 | 0.97 | 25 | 15 |
| GSC 60.0/30.0 | 60.0 | 30.0 | 0.96 | 25 | 10 |
| GSC 70.0/35.0 | 70.0 | 35.0 | 1.10 | 25 | 10 |
| GSC 80.0/40.0 | 80.0 | 40.0 | 1.27 | 25 | 10 |
| GSC 100/50.0 | 100.0 | 50.0 | 1.17 | 25 | 5 |
Code for yellow/green striped tubes: GSC/YG. Standard colours: black, white, yellow, red, blue, green and yellow/green. Source: GALA GSC Thin Wall Flame Retardant Tube catalogue sheet, Issue 2, February 2026.
GDW selection chart, 3:1 shrink ratio
| Part number / size | Internal dia. supplied(mm) | Internal dia. recovered(mm) | Recovered thickness incl. adhesive(mm) | Recovered adhesive thickness(mm) | Standard package |
|---|---|---|---|---|---|
| GDW 3/1 | 3.0 | 1.0 | 0.9 | 0.35 | 200m/spool |
| GDW 6/2 | 6.0 | 2.0 | 1.1 | 0.40 | 50m/spool |
| GDW 9/3 | 9.0 | 3.0 | 1.3 | 0.50 | 30m/spool |
| GDW 12/4 | 12.0 | 4.0 | 1.5 | 0.60 | 30m/spool |
| GDW 18/6 | 18.0 | 6.0 | 1.9 | 0.70 | 30m/spool |
| GDW 24/8 | 24.0 | 8.0 | 2.2 | 0.80 | 25m/spool |
| GDW 30/10 | 30.0 | 10.0 | 2.3 | 0.90 | 25m/spool |
| GDW 39/13 | 39.0 | 13.0 | 2.4 | 0.90 | 25m/spool |
| GDW 50/17 | 50.0 | 17.0 | 2.4 | 0.90 | 25m/spool |
Source: GALA GDW Dual Wall Tubing catalogue sheet, Issue 2, July 2026.
GDW selection chart, 4:1 shrink ratio
| Part number / size | Internal dia. supplied(mm) | Internal dia. recovered(mm) | Recovered thickness incl. adhesive(mm) | Recovered adhesive thickness(mm) | Standard package |
|---|---|---|---|---|---|
| GDW 4/1 | 4.0 | 1.0 | 1.05 | 0.40 | 200m/spool |
| GDW 6/1.5 | 6.0 | 1.5 | 1.15 | 0.40 | 100m/spool |
| GDW 8/2 | 8.0 | 2.0 | 1.20 | 0.40 | 50m/spool |
| GDW 12/3 | 12.0 | 3.0 | 1.50 | 0.60 | 30m/spool |
| GDW 16/4 | 16.0 | 4.0 | 1.80 | 0.60 | 30m/spool |
| GDW 24/6 | 24.0 | 6.0 | 2.60 | 0.75 | 25m/spool |
Source: GALA GDW Dual Wall Tubing catalogue sheet, Issue 2, July 2026.
Material properties
Technical Specifications
| Properties | Value | Standard |
|---|---|---|
| Physical | ||
| Tensile Strength | 9 N/mm² (Mpa) (min.) | ASTM D638 |
| Ultimate Elongation | 300% (min.) | ASTM D638 |
| Water Absorption | 0.15% (max.) | ASTM D570 |
| Specific Gravity | 1.4 | ASTM D792 |
| Longitudinal Change | -10% (max.) | ASTM D638 |
| Thermal | ||
| Operating Temperature | -55 °C to +125 °C | IEC 216 |
| Heat Shock (250 °C for 4 hrs.) | No dripping, cracking or flowing | |
| Low Temperature Flexibility (-55 °C for 4 hrs.) | No Cracking | ASTM D2671 |
| Flammability | Pass | UL224 VW-1 |
| Chemical | ||
| Fungus Resistance | Inert | MIL-1-7444 |
| Copper Corrosion | Good | ASTM D2671B |
| Chemical Resistance | Good | ASTM D2671 |
| Electrical | ||
| Dielectric Strength | >20kV/mm. | ASTM D2671 |
| Di-electric Constant | 3.0 (max.) | ASTM D150 |
| Volume Resistivity | 1 x 10¹³ Ohm.cm (min.) | ASTM D257 |
Source: GALA GSC Thin Wall Flame Retardant Tube catalogue sheet, Issue 2, February 2026.
GDW technical specification
| Properties | Value | Standard |
|---|---|---|
| Physical | ||
| Tensile Strength | 9 N/mm² (Mpa) (min.) | ASTM D638 |
| Ultimate Elongation | 300% (min.) | ASTM D638 |
| Water Absorption | 0.15% (max.) | ASTM D570 |
| Specific Gravity | 1.4 | ASTM D792 |
| Longitudinal Change | -10% (max.) | ASTM D638 |
| Thermal | ||
| Operating Temp. (outer wall) | -55 °C to +125 °C | IEC 216 |
| Heat Shock (250 °C for 4 hrs.) | No dripping, cracking or flowing (outer wall) | |
| Flammability | Pass | ASTM D2671 |
| Chemical | ||
| Fungus Resistance | Inert | MIL-1-7444 |
| Copper Corrosion | Good | ASTM D2671B |
| Chemical Resistance | Good | ASTM D2671 |
| Electrical | ||
| Dielectric Strength | >15kV/mm | ASTM D2671 |
| Di-electric Constant | 3.0 (max.) | ASTM D150 |
| Volume Resistivity | 1 x 10¹³ Ohm.cm (min.) | ASTM D257 |
Dimensions & Drawings
GSC is a flame-retardant thin-wall tube for light-duty wire harnessing, in-line component insulation and busbar insulation for switchgear. GDW is dual wall tubing manufactured by co-extrusion of polyolefin and hot-melt adhesive, providing both insulation and sealing for the article it covers.
Covered on this page
- Heat Shrinkable Tubes/Heat Shrink Sleeves
- Thin Wall Tubes
- GSC : Thin Wall Flame Retardant Tube
- GDW : Dual Wall Tubing
Features & Benefits
- GSC series is flame retardant
- GDW dual-wall tubing co-extrudes polyolefin with a hot-melt adhesive layer
- Provides combined electrical insulation and environmental sealing
Applications
- Sealing and insulating protected articles (GDW)
FAQs
Frequently Asked Questions
What is the Heat Shrinkable Thin Wall Tubes used for?
It is used for:
- Sealing and insulating protected articles (GDW)
How do I choose the right size?
A heat-shrink part is chosen by two diameters. As supplied (Supplied I.D. (mm)) it must open wider than the largest thing it has to slide over; after shrinking (Recovered I.D. (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.
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