Insulation Gasket & Plastic Clip for Dissimilar Metal Isolation — Stainless Steel Coil Tube Support System
Product Overview
Wenzhou Jixing Metal Materials Co., Ltd. offers a specialized line of insulation gaskets and plastic clips engineered specifically for the critical application of dissimilar metal isolation between stainless steel coil tubes and carbon steel support brackets. This product line falls under the Installation & Maintenance category, serving as an essential protective measure in industrial piping systems where stainless steel tubing interfaces with ferrous structural components.
The fundamental engineering principle behind this product is the complete electrical and physical separation of stainless steel from carbon steel. When these two metals are in direct contact in the presence of an electrolyte — such as rainwater, atmospheric moisture, or condensation — a galvanic cell is formed, resulting in galvanic (electrochemical) corrosion. Under wet conditions, the corrosion rate can escalate dramatically, leading to rapid degradation of the stainless steel tube at the contact point, bracket failure, and ultimately system compromise. These insulation components eliminate the conductive pathway, thereby neutralizing the galvanic coupling effect entirely.
Material & Properties
Each insulation gasket and plastic clip is manufactured from high-performance engineering polymers selected for their exceptional electrical resistivity, chemical inertness, and mechanical durability in demanding industrial environments.
- Base Polymer: High-density polyethylene (HDPE), polypropylene (PP), or nylon 66 (PA66) — selected based on operating temperature and load requirements
- Electrical Resistivity: > 10¹⁴ Ω·cm, ensuring complete galvanic isolation
- Operating Temperature Range: -40 °C to +120 °C (standard grade); up to +180 °C (high-temperature nylon variants)
- UV Resistance: Carbon-black stabilized formulations for outdoor and rooftop installations
- Chemical Resistance: Excellent resistance to acids, alkalis, salts, and industrial atmospheres
- Compressive Strength: > 15 MPa (HDPE); > 30 MPa (Nylon 66)
- Friction Coefficient: Low coefficient of friction to accommodate thermal expansion of the coil tube
- Water Absorption: < 0.5% (HDPE); < 1.2% (Nylon 66)
- Service Life: 15–25 years under normal industrial conditions
Specifications
| Parameter | Specification |
|---|---|
| Product Category | Insulation Gasket / Plastic Clip — Dissimilar Metal Isolation |
| Applicable Tube OD | 6 mm – 219 mm (custom sizes available) |
| Bracket Compatibility | Carbon steel, mild steel, and other ferrous support structures |
| Insulation Gasket Thickness | 2 mm – 10 mm (selectable per load and gap requirements) |
| Plastic Clip Load Capacity | Up to 50 kg per clip (depending on tube OD and configuration) |
| Available Colors | Black (UV-stabilized), Natural, Grey, Red (corrosion-warning indicator) |
| Installation Method | Slip-on, clamp-type, or bonded — secured with stainless steel fasteners |
| Compliance Standards | ISO 9001, GB/T 1499.2, ASTM D638, EN 1035 |
| Minimum Order Quantity | 500 pieces (custom tooling for larger volumes) |
| Origin | Wenzhou, Zhejiang, China — Wenzhou Jixing Metal Materials Co., Ltd. |
Manufacturing Process
Wenzhou Jixing Metal Materials Co., Ltd. employs precision manufacturing techniques to ensure consistent dimensional accuracy and material integrity across every production batch:
- Raw Material Selection: Virgin-grade engineering polymer pellets are sourced from certified suppliers and subjected to incoming quality inspection for molecular weight distribution, moisture content, and additive compliance.
- Precision Injection Molding: Plastic clips are produced using high-tonnage injection molding machines with tight tolerance control (±0.05 mm) to ensure proper fit over the stainless steel tube OD and secure engagement with the carbon steel bracket.
- Compression Molding / Die Cutting: Insulation gaskets are manufactured via precision die cutting or compression molding to achieve uniform thickness, clean edges, and consistent compressive properties across the full contact surface.
- UV Stabilization & Additive Incorporation: Carbon black masterbatch and UV stabilizers are compounded into the polymer during the melt stage to ensure long-term resistance against outdoor weathering and oxidative degradation.
- Quality Inspection: Each batch undergoes 100% visual inspection and sampling-based mechanical testing (tensile strength, compression set, electrical resistivity) to verify conformance with specification requirements.
- Packaging & Traceability: Products are packaged in moisture-proof, UV-protected packaging with batch traceability codes for full supply chain accountability.
Applications
This insulation gasket and plastic clip system is indispensable in any installation where stainless steel coil tubes are supported by carbon steel brackets, saddles, or structural frameworks. Key application areas include:
- Chemical Processing Plants: Isolating 304/316L stainless steel process piping from carbon steel pipe racks and support structures exposed to atmospheric moisture and corrosive atmospheres.
- Oil & Gas Facilities: Protecting stainless steel heat exchanger coil tubes and instrument tubing mounted on carbon steel platforms in coastal or offshore environments.
- Food & Beverage Industry: Ensuring hygienic-grade stainless steel sanitary piping maintains corrosion resistance when supported by structural carbon steel frames in washdown environments.
- Pharmaceutical Manufacturing: Preventing galvanic contamination at support points in GMP-regulated facilities where material integrity is critical.
- Power Generation & Desalination: Isolating stainless steel condensate tubing, feedwater lines, and coil assemblies from carbon steel structural supports in high-humidity environments.
- Marine & Offshore Platforms: Providing galvanic isolation in chloride-rich marine atmospheres where corrosion rates are accelerated.
- Building Services & HVAC: Protecting stainless steel refrigerant coil tubing and condensate lines from carbon steel support brackets in rooftop and outdoor installations.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains rigorous quality management systems to ensure every product meets international standards and customer specifications:
- ISO 9001:2015 — Quality Management System Certification
- ISO 14001 — Environmental Management System
- GB/T 1499.2 — Chinese national standard for steel bar straightness and dimensional tolerances (applicable to bracket compatibility)
- ASTM D638 — Standard Test Method for Tensile Properties of Plastics
- EN 1035 — European standard for straightness of hot-rolled steel products (bracket reference)
- NORSOK M-501 — Corrosion control requirements for materials (available upon request for offshore applications)
- Material Test Reports (MTR) — Provided with every shipment, including polymer grade certification, mechanical property data, and electrical resistivity verification
Unique Selling Points
"Complete Galvanic Isolation — Zero Corrosion Risk at Support Points"
- Eliminates Extreme Galvanic Corrosion Rates: In rainwater and condensation conditions, unprotected stainless steel-to-carbon steel interfaces can experience galvanic corrosion rates exceeding 100× the base corrosion rate. This product eliminates that risk entirely through proven polymer-based electrical isolation.
- Engineered for Coil Tube Geometry: Unlike generic insulation materials, these gaskets and clips are purpose-designed to conform to the curved profile of stainless steel coil tubes, providing uniform contact pressure and reliable support without point-loading or tube deformation.
- Thermal Expansion Accommodation: The low-friction polymer surface allows the coil tube to expand and contract freely during thermal cycling, preventing stress buildup at support points and avoiding fatigue failure of both the tube and the bracket.
- Long Service Life with Minimal Maintenance: UV-stabilized polymer formulations resist degradation for 15–25 years, significantly reducing inspection intervals and replacement costs compared to organic rubber or felt alternatives.
- Chemical Inertness: Unlike rubber-based gaskets that can degrade in chemical environments, these engineering polymer components maintain their mechanical and electrical properties in aggressive chemical atmospheres.
- Custom Engineering Available: Wenzhou Jixing Metal Materials Co., Ltd. offers custom tooling and design services to develop insulation components tailored to specific tube diameters, bracket configurations, and environmental conditions.
- Complete Supply Chain Integration: As a vertically integrated manufacturer based in Wenzhou — China's premier stainless steel processing hub — the company provides seamless coordination between coil tube supply and support accessory procurement, reducing project complexity and lead times.
Technical Advisory
Wenzhou Jixing Metal Materials Co., Ltd. strongly recommends that all stainless steel coil tube installations incorporate dissimilar metal isolation at every carbon steel support interface. The cost of these insulation components is negligible compared to the catastrophic consequences of galvanic corrosion — including tube perforation, system shutdown, chemical leakage, and costly emergency repairs. Our engineering team is available to provide site-specific isolation design recommendations, load calculations, and material selection guidance to ensure optimal performance for your specific application.