Model: CHST
Crimp Sealing Heat Shrinkable Tubing (CHST) – High-Temperature End Seal
Crimp Sealing Heat Shrinkable Tubing (CHST) is a premium 3:1 shrink ratio tubing manufactured from cross-linked polyolefin and lined with a high-performance Polyamide hot-melt adhesive. Specifically engineered for sealing terminals and crimp splices, it provides superior waterproofing, corrosion resistance, and complete electrical insulation for harsh environments.
Unlike standard EVA-lined tubes, the Polyamide adhesive in CHST offers enhanced thermal stability and stronger bonding strength, making it ideal for applications requiring continuous operation up to 125°C. Furthermore, this high-performance tubing serves as the core insulating and sealing component in the manufacturing of our DuraSeal Heat Shrink Butt Splices (DHSCS). Available in color-coded sizes (Red, Blue, Yellow) to match standard wire gauges, it ensures a secure, moisture-proof seal over crimp connections in automotive, marine, and industrial electrical systems.
Key Features & Benefits
- 3:1 High Shrink Ratio: Accommodates a wide range of cable and terminal sizes, ensuring a tight fit over irregular crimp shapes.
- Polyamide Adhesive Lining: High-temperature hot-melt glue provides superior bonding strength and thermal stability compared to standard EVA adhesives.
- Color-Coded Identification: Red, Blue, and Yellow options correspond to standard wire gauge sizes for quick and error-free installation.
- Wide Operating Temperature: Reliable performance from -55°C to +125°C, suitable for under-hood automotive and heavy industrial applications.
- Complete Environmental Seal: 100% waterproof and moisture-proof, preventing corrosion and oxidation of copper conductors.
- High Dielectric Strength: Provides robust electrical insulation with a volume resistivity of ≥ 1014 Ω·cm.
Common Applications
- Waterproof sealing of crimp terminals and splices in automotive wiring harnesses
- Insulation and corrosion protection for marine and offshore electrical connections
- End-sealing of battery cables and heavy-duty power lugs
- Environmental protection for industrial control panel wiring
- Core sealing component for manufacturing DuraSeal Heat Shrink Butt Splices (DHSCS)
- Retroactive insulation of exposed crimp points in harsh chemical environments
Product Specifications
- Material: Cross-Linked Polyolefin + Polyamide Hot-Melt Adhesive
- Shrink Ratio: 3:1
- Operating Temperature: -55°C to +125°C
- Minimum Shrink Temperature: 125°C
- Full Recovery Temperature: 140°C
- Standard Colors: Red, Blue, Yellow
Technical Properties
| Item | Test Condition | Value |
|---|---|---|
| Tensile Strength (Un-aged) | Room Temp. | ≥ 13.7 MPa (1.40 kgf/mm²) |
| Elongation at Break (Un-aged) | Room Temp. | ≥ 200% |
| Tensile Strength (Aged) | 158°C / 7 days | ≥ 9.7 MPa (0.99 kgf/mm²) |
| Elongation at Break (Aged) | 158°C / 7 days | ≥ 100% |
| Voltage Withstand & Breakdown (Un-aged) | Room Temp. | Withstand 2.5 kV / 1 min |
| Voltage Withstand & Breakdown (Aged) | 158°C / 7 days | Withstand 2.5 kV / 1 min (Breakdown ≥ 50% of un-aged) |
| Copper Corrosion | 158°C / 7 days | No corrosion of bare copper |
| Copper Stability | 158°C / 7 days | No degradation, Min. Elongation 100% |
| Cold Bend | -30°C / 1 hr | No cracking |
| Maximum Secant Modulus (2%) | – | ≥ 17.3 MPa (1.765 kgf/mm²) |
| Volume Resistivity | – | ≥ 1×1014 Ω·cm |
| Heat Shock | 250°C / 4 hrs | No cracking |
Dimensions & Specifications
| Model | Color | Supplied I.D. (mm) |
Supplied Thickness (mm) |
Recovered I.D. (Max) (mm) |
Recovered Thickness (Total / Adhesive) (mm) |
Cut Length (mm) |
Std. Length (m/spool) |
|---|---|---|---|---|---|---|---|
| CHST-1 | Red | 4.7 ± 0.3 | 0.45 | 1.40 | 1.00 / 0.35 | 38 | 100 |
| CHST-2 | Blue | 5.7 ± 0.3 | 0.45 | 1.55 | 1.10 / 0.40 | 38 | 100 |
| CHST-3 | Yellow | 6.7 ± 0.3 | 0.50 | 2.10 | 1.10 / 0.45 | 42 | 100 |
Frequently Asked Questions (FAQ)
Q: What is the relationship between this CHST tubing and DuraSeal Heat Shrink Butt Splices (DHSCS)?
A: CHST tubing is the core insulating and sealing component used in the manufacturing of our DuraSeal Heat Shrink Butt Splices. The same high-quality Polyamide adhesive lining and 3:1 shrink ratio are built directly into the DuraSeal barrel. If you are a manufacturer looking for the raw sealing tubing, CHST is your ideal choice. If you need a ready-to-use, all-in-one crimp connector for field installation, we highly recommend the finished DuraSeal product.
Q: How does the Polyamide adhesive in CHST compare to standard Dual Wall tubing?
A: CHST uses a Polyamide (Nylon-based) adhesive, which offers higher thermal stability and stronger bonding at 125°C compared to the standard EVA (Ethylene Vinyl Acetate) adhesive found in most Dual Wall Heat Shrink Tubing. If your application involves extreme under-hood heat or aggressive fluids, CHST is the superior choice. For general-purpose waterproofing at lower temperatures (up to 110°C), standard EVA-lined dual wall tubing is a more cost-effective option.
Q: What do the Red, Blue, and Yellow colors correspond to?
A: These colors follow the industry-standard DIN/ISO color coding for crimp terminals: Red typically fits 0.5-1.5 mm² (22-16 AWG) wires, Blue fits 1.5-2.5 mm² (16-14 AWG), and Yellow fits 4-6 mm² (12-10 AWG). This color-coding helps installers quickly select the correct tubing size for their specific wire gauge.
Q: Can this tubing be cut to custom lengths?
A: Yes, the standard lengths provided (100m spools) can be easily cut to your required size using standard scissors or a knife. The “Cut Length” column in our specification table (38mm or 42mm) indicates the minimum recommended length to ensure a proper seal over the crimp barrel and wire insulation transition.
Q: Is this tubing resistant to fuels and oils?
A: Yes, the cross-linked polyolefin outer shell and the Polyamide adhesive lining provide excellent resistance to automotive fuels, lubricating oils, and hydraulic fluids, making CHST ideal for engine compartment and transmission wiring applications.
Q: What is the recommended heat source for installation?
A: A standard heat gun is recommended. Apply heat evenly starting from the center of the tubing and moving outwards to both ends. This technique helps prevent air pockets and ensures the Polyamide adhesive flows uniformly to create a complete seal. Avoid using open flames, which can damage the tubing surface.