Heat Shrink Double Layer Tube-GDTL Tube

Insultube ‐ Double Layer is manufactured by Heat Shrinkable Insulating material and Heat Shrinkable Semi-Conductive material with special technology for good insulation in its inner layer and good semi-conduction in its outer layer; providing reliable shield protection.

This tubes are made from High Quality Cross-linked Polyolefin material with Co-extrusion Technology.

This tube is used in Power Cable Straight Through Joints for insulating and outer-shielding layer up to 36kV. It can also be used to other places wherever insulation and shielding is required.

SELECTION CHART

All dimensions are in mm

• Gala Size
• D (Min.)
• d (Max.)
• T (Min.)

• GDLT 30/11
• 30
• 11
• 5.0 ± 0.3

• GDLT 35/13
• 35
• 13
• 5.0 ± 0.3

• GDLT 45/16
• 45
• 16
• 5.0 ± 0.3

• GDLT 55/20
• 55
• 20
• 5.0 ± 0.3

• GDLT 65/27
• 65
• 27
• 5.0 ± 0.3

• GDLT 85/30
• 85
• 30
• 7.5 ± 0.3

• GDLT 100/35
• 100
• 35
• 7.0 ± 0.3

• GDLT 120/45
• 120
• 45
• 7.0 ± 0.4

D,d : Internal Diameter; T : Thickness

TECHNICAL SPECIFICATION

PROPERTIES	INNER INSULATION LAYER	OUTER SEMI-COND. LAYER	STANDARD
	Value	Value
Physical
Tensile Strength	12 Mpa(N/mm2) (min.)	12 Mpa(N/mm2) (min.)	ASTM D638
Ultimate Elongation	300% (Min.)	300% (Min.)	ASTM D638
Longitudinal Change	-10% (Max.)	-10% (Max.)	ASTM D2671
Hardness	50 ± 3 Shore D	50 ± 3 Shore D	ASTM D2240
Water absorption	0.5 % (max.)	0.5 % (max.)	ASTM D570
Thermal
Accelerated ageing	( 120⁰C for 500 Hrs )	( 120⁰C for 500 Hrs )	ASTM D2671
Tensile Strength	10.5Mpa (N/mm ) (min.)	10.5Mpa (N/mm ) (min.)	ASTM D638
Ultimate Elongation	270 % (min.)	270 % (min.)	ASTM D638
Low Temperature Flexibility	No Cracking	No Cracking	ASTM D2671
-40⁰C for 4 hrs.)
Heat Shock (250⁰C for 30 min.)	No cracking or flowing	No cracking or flowing	ESI 09-11
Shrink Temperature	135⁰C	135⁰C	IEC 216
Continuous Temperature limit	-40 to +100⁰C	-40 to +100⁰C	IEC 216
Electrical
Dielectric Strength	20 KV/mm.(min)	N/A	ASTM D149
Volume Resistivity	1 x 1014 Ohm.cm (min)	1 x 103 Ohm.cm (min	ASTM D257

Features & Benefits:

• Dual wall Conducting / Insulating.
• Excellent Electrical properties.
• Operation Temperature : -40⁰C to 100⁰C
• Minimum Shrink Temperature : 100⁰C.
• Minimum fully Shrink Temperature : 130⁰C
• Standard Color : Black/Red