GDW Dual Wall Heat Shrink Tubing — 3:1 & 4:1 Shrink Ratio
GDW dual wall tubing co-extrudes polyolefin over hot-melt adhesive to insulate and environmentally seal wire splices and harness connections, available in both 3:1 and 4:1 shrink ratio ranges.
- 15 kV/mm dielectric strength
- RoHS compliant, IP68 rated
- IEC
- ASTM
- UL 224
Choose a size
Selection Charts
| 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 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 |
Source: GALA GDW Dual Wall Tubing catalogue sheet, Issue 2, July 2026.
Dimensions & Drawings
GDW co-extrudes polyolefin over a hot-melt adhesive lining, insulating and environmentally sealing wire splices and harness connections in one shrink, available in 3:1 and 4:1 shrink-ratio ranges.
Covered on this page
- GDW: Dual Wall Tubing
- APPLICATIONS :
Features & Benefits
- Co-extruded polyolefin over hot-melt adhesive
- Available in 3:1 and 4:1 shrink ratio ranges
- -55°C to +125°C operating range
- 15 kV/mm dielectric strength
- RoHS compliant, IP68 rated
- GDW 3/1 to GDW 50/17 size range
Applications
- Wire splice and harness sealing in automotive and communication equipment
- Alternative to moulded parts and cable breakouts
- Telecommunication, industrial equipment and avionics cable insulation
Standards & Compliance
- IEC
- ASTM
- UL 224
- MIL-SPEC
FAQs
Frequently Asked Questions
What is the GDW Dual Wall Heat Shrink Tubing used for?
It is used for:
- Wire splice and harness sealing in automotive and communication equipment
- Alternative to moulded parts and cable breakouts
- Telecommunication, industrial equipment and avionics cable insulation
How do I choose the right size?
A heat-shrink part is chosen by two diameters. As supplied (Internal dia. supplied (mm)) it must open wider than the largest thing it has to slide over; after shrinking (Internal dia. recovered (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
- ASTM
- UL 224
- MIL-SPEC
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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