Dual Wall Adhesive Lined Heat Shrink Tube 3:1 and 4:1 (GDW)

About Dual Wall Adhesive Lined Heat Shrink Tube 3:1 and 4:1 (GDW)

GDW is Gala's dual wall tubing. Two layers are co-extruded together: an outer wall of cross-linked polyolefin that insulates and protects, and an inner wall of hot-melt adhesive. When the tube is heated the outer wall shrinks and the adhesive melts and flows into the gaps between wires, so one shrink gives both electrical insulation and a permanent seal against water and dirt.

It is used to seal wire splices and harness joints in automotive and communication equipment, as a simpler alternative to moulded parts and cable breakouts, and to insulate cables that carry connectors of different sizes in telecom, industrial equipment and avionics. The 4:1 range is useful where the tube must pass over a large connector and still grip a thin wire.

Two ranges are offered. The 3:1 range runs from GDW 3/1 to GDW 50/17; the 4:1 range from GDW 4/1 to GDW 24/6. Each size is supplied on a spool of 25 to 200 m. The code gives supplied and recovered inside diameter in mm; the recovered wall thickness quoted includes the adhesive layer.

GDW is listed by UL as a Recognized Component under file E328193 (heat-shrinkable polyolefin tubing with meltable liner, 600 V, 125 deg C, VW-1 flame rating). It is shrunk with a gas torch, working from the centre outwards until adhesive shows at both ends.

Manufactured by Gala in India. Datasheet and size selection on request.

Specifications

• Brand: Gala
• Product type: Dual wall (adhesive lined) heat shrink tube
• Material: Co-extruded cross-linked polyolefin outer wall with hot-melt adhesive inner wall
• Colour: Black (other colours: confirm with GSF)
• Voltage rating: 600 V (UL recognition)
• Operating temperature: -55 deg C to +125 deg C (outer wall)
• Shrink ratio: 3:1 and 4:1 ranges
• Size range: 3 mm to 50 mm supplied ID (3:1); 4 mm to 24 mm supplied ID (4:1)
• Wall type / thickness: 0.9 mm to 2.6 mm after recovery including adhesive
• Adhesive / sealant: Hot-melt adhesive inner wall, 0.35 to 0.90 mm after recovery
• Standards tested to: UL Recognized Component, file E328193 (UL 224 basis, VW-1); other test methods quoted on GSF's datasheet - ASTM D638, ASTM D570, ASTM D150, ASTM D257
• Application: Sealing and insulating wire splices, harness joints and connector transitions
• Installation: Gas torch, centre outwards, until adhesive appears at both ends
• Country of origin: India
• Tensile strength: 9 N/mm2 min (ASTM D638)
• Elongation at break: 300% min
• Water absorption: 0.15% max
• Dielectric strength: 15 kV/mm min
• Dielectric constant: 3.0 max
• Volume resistivity: 1 x 1013 ohm.cm min
• Packing: Spools of 25 m to 200 m depending on size

Sizes

• GDW 3/1 | 3:1 | 3.0 / 1.0 | wall 0.9 | adhesive 0.35 | 200 m spool
• GDW 6/2 | 3:1 | 6.0 / 2.0 | wall 1.1 | adhesive 0.40 | 50 m
• GDW 9/3 | 3:1 | 9.0 / 3.0 | wall 1.3 | adhesive 0.50 | 30 m
• GDW 12/4 | 3:1 | 12.0 / 4.0 | wall 1.5 | adhesive 0.60 | 30 m
• GDW 18/6 | 3:1 | 18.0 / 6.0 | wall 1.9 | adhesive 0.70 | 30 m
• GDW 24/8 | 3:1 | 24.0 / 8.0 | wall 2.2 | adhesive 0.80 | 25 m
• GDW 30/10 | 3:1 | 30.0 / 10.0 | wall 2.3 | adhesive 0.90 | 25 m
• GDW 39/13 | 3:1 | 39.0 / 13.0 | wall 2.4 | adhesive 0.90 | 25 m
• GDW 50/17 | 3:1 | 50.0 / 17.0 | wall 2.4 | adhesive 0.90 | 25 m
• GDW 4/1 | 4:1 | 4.0 / 1.0 | wall 1.05 | adhesive 0.40 | 200 m
• GDW 6/1.5 | 4:1 | 6.0 / 1.5 | wall 1.15 | adhesive 0.40 | 100 m
• GDW 8/2 | 4:1 | 8.0 / 2.0 | wall 1.20 | adhesive 0.40 | 50 m
• GDW 12/3 | 4:1 | 12.0 / 3.0 | wall 1.50 | adhesive 0.60 | 30 m
• GDW 16/4 | 4:1 | 16.0 / 4.0 | wall 1.80 | adhesive 0.60 | 30 m
• GDW 24/6 | 4:1 | 24.0 / 6.0 | wall 2.60 | adhesive 0.75 | 25 m

Applications: Automotive wire harness, communication and telecom equipment, industrial equipment, avionics and aerospace wiring, marine electrical (lug and terminal insulation), cable assembly