HS-GF 3X&4X Marine Heat Shrink Tube (Military Standard, Double-Wall)
Military-standard marine heat shrink tube with double-wall adhesive lining for durable sealing.
Offered in 3:1 and 4:1 shrink ratios; initial ≥70 °C, full ≥125 °C; operating −45 °C to +135 °C.
Semi-rigid, UV-resistant outer; RoHS compliant; low water absorption for marine use.
Ideal for shipboard wiring, wire harness, pipe/cable corrosion protection and repairs.
Overview – Marine Heat Shrink Tube (Double-Wall, Adhesive-Lined)
The HS-GF Series is a military-standard marine heat shrink tube featuring a double-wall
construction—radiation cross-linked polyolefin outer layer with a hot-melt adhesive liner. Available in both
3:1 and 4:1 shrink ratios, it delivers excellent insulation, sealing and corrosion
protection in humid, salt-spray and other harsh marine environments.
Shrink Ratios: 3:1 and 4:1
Structure: Polyolefin outer + hot-melt adhesive inner
Initial Shrink: ≥70 °C
Full Shrink: ≥125 °C
Operating Temp: −45 °C ~ +135 °C
Compliance: RoHS • Low water absorption • UV resistant
Key Features
- Adhesive-lined double wall for waterproof, airtight sealing
- Outer layer is UV-resistant; durable for outdoor & marine use
- High tensile strength (≥10.4 MPa), high elongation (≥300%)
- Low water absorption (≤0.5%); corrosion protection on metal pipes
Applications
- Shipboard & marine cables, wire harness insulation and sealing
- Waterproofing and corrosion protection of metal pipes and connectors
- General wiring repairs, cable branching and identification
Outer Technical Indicators
| Performance | Index | Experimental methods |
|---|---|---|
| Tensile strength (MPa) | ≥10.4 | ASTM D 2671 |
| Elongation at break (%) | ≥300 | ASTM D 2671 |
| Aging strength (MPa) | ≥8.4 | 175 °C × 168 h |
| Elongation at break after aging (%) | ≥100 | 175 °C × 168 h |
| Axial rate of change | −8% ~ +8% | ASTM D 2671 |
| Flame retardancy | Pass | ASTM D 2671 B (method) |
| Thermal shock | No cracks, no dripping | ASTM D 2671 (250 °C × 4 h) |
| Cold bending flexibility | No crack | ASTM D 2671 (−45 °C × 4 h) |
| Water absorption (%) | <0.5 | ASTM D 570 |
| Breakdown strength (kV/mm) | ≥15 | IEC 60243 |
| Volume resistivity (Ω·cm) | ≥1014 | IEC 60093 |
Hot-Melt Adhesive Specifications
| Performance | Index | Experimental methods |
|---|---|---|
| Softening point (°C) | 90±5 | ASTM E 28 |
| Water absorption (%) | <0.5 | ASTM D 570 |
| Peel strength (PE) (N/25mm) | 120 | ASTM D 1000 |
| Peel strength (Al) (N/25mm) | 80 | ASTM D 1000 |
Product Specifications – 3:1
| Inch | mm | Supplied inner diameter (mm) | Complete contraction (mm) | Standard packaging (M/root) | ||
|---|---|---|---|---|---|---|
| Inner diameter (≤) | Total wall thickness | Adhesive layer (thick wall) | ||||
| 1/8 | Φ3.2 | ≥3.2 | ≤1.00 | 0.90±0.30 | 0.40±0.20 | 200 |
| 3/16 | Φ4.8 | ≥4.8 | ≤1.60 | 1.05±0.30 | 0.40±0.20 | 100 |
| 1/4 | Φ6.4 | ≥6.4 | ≤2.20 | 1.25±0.30 | 0.45±0.20 | 100 |
| 5/16 | Φ7.9 | ≥7.9 | ≤2.70 | 1.35±0.30 | 0.45±0.20 | 100 |
| 3/8 | Φ9.5 | ≥9.5 | ≤3.20 | 1.45±0.30 | 0.50±0.20 | 50 |
| 1/2 | Φ12.7 | ≥12.7 | ≤4.20 | 1.65±0.30 | 0.50±0.20 | 1.22 |
| 5/8 | Φ15.0 | ≥15.0 | ≤5.20 | 1.80±0.30 | 0.55±0.30 | 1.22 |
| 3/4 | Φ19.1 | ≥19.1 | ≤6.30 | 1.95±0.30 | 0.60±0.30 | 1.22 |
| 1 | Φ25.4 | ≥25.4 | ≤8.50 | 2.00±0.40 | 0.60±0.30 | 1.22 |
| 1-1/4 | Φ30.0 | ≥30.0 | ≤10.20 | 2.15±0.40 | 0.65±0.30 | 1.22 |
| 1-1/2 | Φ39.0 | ≥39.0 | ≤13.50 | 2.45±0.40 | 0.75±0.30 | 1.22 |
| 2 | Φ50.0 | ≥50.0 | ≤17.00 | 2.75±0.40 | 0.80±0.30 | 1.22 |
Product Specifications – 4:1
| Inch | mm | Supplied inner diameter (mm) | Complete contraction (mm) | Standard packaging (M/root) | ||
|---|---|---|---|---|---|---|
| Inner diameter (≤) | Total wall thickness | Adhesive layer (thick wall) | ||||
| 2/13 | Φ4.0 | ≥4.0 | ≤1.00 | 1.05±0.30 | 0.50±0.20 | 200 |
| 1/4 | Φ6.0 | ≥6.0 | ≤1.5 | 1.15±0.30 | 0.50±0.20 | 100 |
| 5/16 | Φ8.0 | ≥8.0 | ≤2.0 | 1.55±0.30 | 0.60±0.25 | 100 |
| 1/2 | Φ12.0 | ≥12.0 | ≤3.0 | 1.75±0.30 | 0.60±0.25 | 1.22 |
| 5/8 | Φ16.0 | ≥16.0 | ≤4.0 | 2.00±0.35 | 0.70±0.30 | 1.22 |
| 3/4 | Φ19.1 | ≥19.1 | ≤5.0 | 2.30±0.40 | 0.70±0.30 | 1.22 |
| 1 | Φ24.0 | ≥24.0 | ≤6.0 | 2.60±0.40 | 0.75±0.30 | 1.22 |
| 1-1/4 | Φ32.0 | ≥32.0 | ≤8.0 | 2.95±0.40 | 0.85±0.30 | 1.22 |
| 2 | Φ52.0 | ≥52.0 | ≤13.0 | 3.35±0.50 | 0.95±0.30 | 1.22 |
Looking for more options? Browse our
heat-shrink tubing pillar page,
or see our adhesive-lined double-wall model
HS4X-B.
heat-shrink tubing pillar page,
or see our adhesive-lined double-wall model
HS4X-B.
Related Products
- Electrical heat shrink tube — HTS 2X
- Polyolefin heat shrink tube — HTD 2X
- Adhesive lined heat shrink tube — HS4X-B
- Heat shrink tube kit — HSTW2X
- Heat shrink end cap — HSC-F
- Semi-rigid heat shrink end cap — HSC-B
- Heat shrink tube for auto (EV busbar) — HSNE-F
Standards Referenced
FAQs
What is HS-GF used for?
HS-GF is a marine heat shrink tube (3X/4X options) designed for salt-mist, splash and outdoor environments. It provides electrical insulation, corrosion protection and strain relief on boat wiring and marine harnesses.
Is HS-GF waterproof?
After full recovery, HS-GF provides tight environmental protection for marine wiring. For joints that require adhesive-lined waterproof sealing, also consider
HS4X-B.
HS4X-B.
How to size HS-GF correctly?
Choose an expanded ID 20–30% larger than the largest object OD. For 3:1/4:1 ratios, ensure the recovered ID is smaller than the object OD for a firm marine-grade grip.
