Cable Protection

LJR Heat Shrink
Tubing.

GREMTUBE® heat shrink tubing — UL-recognized thin wall and dual wall, MIL-SPEC compliant, and REACH certified for protection across aerospace, defense, industrial, and transportation applications.

LJR Heat Shrink Tubing

LJR Electronics Own Brand

GREMTUBE® — protective solutions for cables and wire assemblies

LJR Electronics stocks GREMTUBE® heat shrink tubing — a flexible, flame retardant polyolefin tubing range available in thin wall and dual wall variants. Engineered for insulation, sealing, strain relief, cable bundling, and identification across demanding industries.

UL recognized under File E328344 and compliant with MIL-I-23053/5 military specifications, GREMTUBE® is specified by customers in aerospace, defense, rail, marine, industrial, and energy applications worldwide. All products are halogen-free and REACH compliant.

  • ✓ UL Recognition — File E328344
  • ✓ MIL-I-23053/5 Class 1 and 3 compliant
  • ✓ Railway approved — EN 45545-2
  • ✓ Halogen-free formulation
  • ✓ REACH compliant
  • ✓ Shrink ratios: 2:1, 3:1, and 4:1
  • ✓ Spools as standard — cut pieces available on request

Thin Wall

GREMTUBE® G63 — 2X & 3X

Flexible, flame retardant polyolefin tubing. Operating temperature −55°C to +135°C. Recovery temperature +90°C. Colors: Black, Red, Blue, Green, Yellow, White.

All dimensions in mm. D = inside diameter as supplied; d = inside diameter after recovery; t = wall thickness after recovery.

Reference ID As Supplied (D) ≥ ID After Recovery (d) ≤ Wall Thickness (t) Spool (m) Stick (m)
001,01.200.600.41 ±0.102001.2
001,51.600.800.41 ±0.102001.2
002,02.401.200.51 ±0.101501.2
003,03.201.600.51 ±0.101501.2
004,54.802.400.51 ±0.101501.2
006,06.403.200.64 ±0.101501.2
009,09.504.800.64 ±0.10751.2
012,012.706.400.64 ±0.10501.2
018,019.109.500.76 ±0.15301.2
025,025.4012.700.89 ±0.15301.2
030,030.0015.000.89 ±0.15301.2
040,040.0020.001.00 ±0.15251.2
050,051.0025.401.15 ±0.15251.2
080,080.0040.001.30 ±0.20201.2
100,0102.0050.801.40 ±0.20201.2
120,0125.0063.501.40 ±0.25201.2

All dimensions in mm. D = inside diameter as supplied; d = inside diameter after recovery; t = wall thickness after recovery.

Reference ID As Supplied (D) ≥ ID After Recovery (d) ≤ Wall Thickness (t) Spool (m) Stick (m)
001,51.500.500.45 ±0.102001.2
003,03.001.000.55 ±0.101501.2
004,54.501.500.60 ±0.101501.2
006,06.002.000.65 ±0.101001.2
009,09.003.000.75 ±0.15751.2
012,012.004.000.75 ±0.15501.2
015,015.005.000.80 ±0.15501.2
018,018.006.000.85 ±0.15301.2
024,024.008.001.00 ±0.20301.2
030,030.0010.001.15 ±0.20301.2
039,039.0013.001.50 ±0.20301.2
050,050.0016.002.50 ±0.20301.2
070,070.0023.002.60 ±0.20301.2
080,080.0026.002.60 ±0.20301.2
090,090.0030.002.60 ±0.20301.2
100,0100.0033.002.60 ±0.20301.2

Thin Wall — Mechanical & Electrical Properties

PropertyConditionValueTest Method
Working Temperature—−55°C to +135°C—
Longitudinal Change—±8%—
Tensile Strength (unaged)—≥ 10.4 MPaUL 224
Elongation at Break (unaged)—≥ 200%UL 224
Tensile Strength (aged)168h @ 175°C≥ 7.3 MPaUL 224
Elongation at Break (aged)168h @ 175°C≥ 100%UL 224
Heat Shock4h @ 250°CNo crackingUL 224
Cold Bend1h @ −55°CNo crackingUL 224
FlammabilityProcedure CVW-1UL 224
Smoke & Toxicity—R24 – HL3EN 45545-2
Dielectric Strength—≥ 19.7 kV/mmASTM D 2671
Dielectric Withstand60s @ 2,500VNo BreakdownUL 224
Volume Resistivity168h @ 175°C≥ 1014 Ω·cmASTM D 876
Copper Stability168h @ 175°CPassUL 224
Anti-Corrosion—PassUL 224

Dual Wall

GREMTUBE® G63A — 3X & 4X

Flexible, flame retardant polyolefin tubing with adhesive inner lining. Operating temperature −45°C to +125°C. Recovery temperature +125°C. Standard color: Black. Red, Blue, Grey available on request.

All dimensions in mm. D = inside diameter as supplied; d = inside diameter after recovery; t = wall thickness after recovery (outer wall only, does not include adhesive).

Reference ID As Supplied (D) ≥ ID After Recovery (d) ≤ Wall Thickness (t) Spool (m) Stick (m)
002,42.400.800.80 ±0.302001.22
003,23.201.000.90 ±0.302001.22
004,84.801.601.05 ±0.301001.22
006,46.402.201.25 ±0.301001.22
007,97.902.701.35 ±0.301001.22
009,59.503.201.45 ±0.30501.22
012,712.704.201.65 ±0.30251.22
015,015.005.201.80 ±0.30251.22
019,119.106.301.95 ±0.30251.22
025,425.408.502.00 ±0.40251.22
030,030.0010.202.15 ±0.40251.22
039,039.0013.502.45 ±0.40251.22
050,050.0017.002.75 ±0.40251.22
075,076.0025.003.05 ±0.50251.22
090,090.0030.003.10 ±0.50251.22
100,0100.0034.003.10 ±0.50251.22
125,0125.0042.003.15 ±0.50251.22

All dimensions in mm. D = inside diameter as supplied; d = inside diameter after recovery; t = wall thickness after recovery (outer wall only).

Reference ID As Supplied (D) ≥ ID After Recovery (d) ≤ Wall Thickness (t) Spool (m) Stick (m)
004,04.001.001.05 ±0.30200—
006,06.001.501.15 ±0.30100—
008,08.002.001.55 ±0.30100—
012,012.003.001.75 ±0.30—1.22
016,016.004.002.00 ±0.30—1.22
020,020.005.002.30 ±0.40—1.22
024,024.006.002.60 ±0.40—1.22
032,032.008.003.00 ±0.50—1.22
040,040.0010.002.80 ±0.50—1.22
052,052.0013.003.35 ±0.50—1.22

Dual Wall — Mechanical, Electrical & Adhesive Properties

PropertyConditionValueTest Method
Working Temperature—−45°C to +125°C—
Longitudinal Change—±8%—
Tensile Strength (unaged)—≥ 10.4 MPaASTM D 2671
Elongation at Break (unaged)—≥ 200%UL 224
Tensile Strength (aged)168h @ 175°C≥ 7.3 MPaASTM D 2671 B
Elongation at Break (aged)168h @ 175°C≥ 100%—
Flammability—Pass—
Dielectric Strength—≥ 15 kV/mmIEC 60243
Volume Resistivity—≥ 1014 Ω·cmIEC 60093
Adhesive Sealing—Good (water & moisture)—
Water Absorption—< 0.2%ASTM D570
Adhesive Softening Point—95°CASTM E28
Peel Strength (PE)—120 N/25mmASTM D1000
Peel Strength (Aluminum)—80 N/25mmASTM D1000

Data provided as a guide only. It remains the user's responsibility to test the product and determine suitability. LJR-RAYFAST shall not be held responsible for any loss or defect resulting from incorrect, improper, or inappropriate use.

Product Overview

Side-by-side comparison

PropertyG63 2X (Thin Wall)G63 3X (Thin Wall)G63A 3X (Dual Wall)G63A 4X (Dual Wall)
Shrink Ratio2:13:13:14:1
Operating Temp−55°C to +135°C−55°C to +135°C−45°C to +125°C−45°C to +125°C
Recovery Temp+90°C+90°C+125°C+125°C
Adhesive LiningNoNoYesYes
UL StandardUL 224 VW-1UL 224 VW-1UL 224 VW-1UL 224 VW-1
Military SpecMIL-I-23053/5MIL-I-23053/5——
RailwayEN 45545-2EN 45545-2——
Colors6 standard6 standardBlack (others on request)Black (others on request)
Size Range1.0 – 120.0 mm1.5 – 100.0 mm2.4 – 125.0 mm4.0 – 52.0 mm

Sizing tip: Select tubing with a supplied inside diameter 20–30% larger than the cable diameter to ensure adequate coverage before shrinking.

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GREMTUBE® Heat Shrink.

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