Co-Extruded Heat Shrink Tube - Medium and Heavy Wall (GMWR / GHWR)

About Co-Extruded Heat Shrink Tube - Medium and Heavy Wall (GMWR / GHWR)

GMWR and GHWR are Gala's co-extruded heat-shrink tubes: the medium-wall (GMWR) and heavy-wall (GHWR) versions share one size chart, from 12/3 up to 130/36, and differ only in wall thickness after recovery (1.5 to 3.0 mm for GMWR, 2.2 to 4.0 mm for GHWR). Co-extrusion gives a soft, flexible tube with a high shrink ratio that recovers quickly and evenly.

Up to size 50/16 the tube can be supplied with a hot-melt adhesive lining. On heating the outer wall shrinks while the adhesive melts and flows into gaps, so the finished cover is waterproof and bonded rather than just tight.

Uses fall into two groups. On cables, it seals terminations and joints against water and gives them mechanical protection, and it insulates underground and aerial connections in CATV networks, CCTV wiring and control-cable splices. On pipework, it gives corrosion protection, environmental sealing and mechanical protection to pipes and pipe connections. Gala states good resistance to chemicals, copper corrosion and UV.

Selecting a size: the first figure is the minimum supplied inside diameter, the second the maximum recovered inside diameter. Order as code, size, "A" for adhesive lining and length in mm, for example GMWR 12/3 A 1000. Standard colour is black; other colours can be made on request.

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

Specifications

• Brand: Gala
• Product type: Co-extruded heat shrink tube, medium wall (GMWR) and heavy wall (GHWR)
• Material: Co-extruded cross-linked polyolefin, optional hot-melt adhesive inner layer
• Colour: Black standard; other colours on request
• Operating temperature: -55 deg C to +125 deg C (outer wall)
• Size range: 12 mm to 130 mm supplied ID; 3 mm to 36 mm recovered ID
• Wall type / thickness: GMWR 1.5 to 3.0 mm, GHWR 2.2 to 4.0 mm after recovery (+/-10%)
• Adhesive / sealant: Hot-melt adhesive lining available up to size 50/16
• Standards tested to: Test methods quoted on Gala's datasheet - ASTM D638, ASTM D570, ASTM D150, ASTM D257
• Application: Waterproof sealing of cable joints, terminations and splices; corrosion and mechanical protection of pipes and pipe connections
• Installation: Heat-shrunk with a gas torch, centre outwards; adhesive bead at both ends shows a complete seal
• Country of origin: India
• Tensile strength: 9 N/mm2 min (ASTM D638)
• Elongation at break: 300% min
• Water absorption: 0.15% max (ASTM D570)
• Dielectric strength: 15 kV/mm min
• Dielectric constant: 3.0 max (ASTM D150)
• Volume resistivity: 1 x 10¹³ ohm.cm min (ASTM D257)
• Ordering format: code + size + A (adhesive) + length in mm, e.g. GMWR 12/3 A 1000

Sizes

• 12/3 | D 12 / d 3 | GMWR wall 1.5 mm | GHWR wall 2.2 mm | adhesive option
• 22/6 | D 22 / d 6 | GMWR 2.0 mm | GHWR 2.5 mm | adhesive option
• 30/8 | D 30 / d 8 | GMWR 2.5 mm | GHWR 3.0 mm | adhesive option
• 33/10 | D 33 / d 10 | GMWR 2.5 mm | GHWR 4.0 mm | adhesive option
• 40/12 | D 40 / d 12 | GMWR 2.5 mm | GHWR 4.0 mm | adhesive option
• 50/16 | D 50 / d 16 | GMWR 2.5 mm | GHWR 4.0 mm | adhesive option
• 65/19 | D 65 / d 19 | GMWR 2.5 mm | GHWR 4.0 mm | no adhesive
• 70/22 | D 70 / d 22 | GMWR 2.5 mm | GHWR 4.0 mm | no adhesive
• 90/28 | D 90 / d 28 | GMWR 3.0 mm | GHWR 4.0 mm | no adhesive
• 130/36 | D 130 / d 36 | GMWR 3.0 mm | GHWR 4.0 mm | no adhesive

Applications: Power and control cable jointing, telecom, CATV and CCTV installers, pipeline and process piping, oil and gas, water utilities, industrial maintenance, marine