PTFE Steel-Plastic Composite Pipe
Model:PTFE Steel-plastic Component Pipe
Kaxite PTFE Steel-Plastic Composite Pipe bonds a ram-extruded virgin PTFE liner tightly into a carbon steel or stainless steel shell, delivering reliable corrosion resistance for aggressive acids, alkalis, and chlorine media. Available from 1" to 8" diameter, up to 4000 mm per section, with a service range of -60°C to +260°C, 1.6 MPa positive pressure, and 77 KPa vacuum. Manufactured to ASTM F1545 in our ISO 9001:2015 facility, with every pipe passing dimensional, thickness, spark, and hydrostatic testing before shipment. Factory-direct pricing, custom end connections, and engineering support for media-specific liner selection.
PTFE Steel-Plastic Composite Pipe is a composite piping product that tightly bonds a virgin PTFE liner into a steel pipe shell, combining the mechanical strength of steel with the chemical resistance of PTFE. Kaxite manufactures these pipes using high-quality ram-extruded PTFE tube and a special processing technology that locks the liner into the steel shell. The result: a corrosion-proof pipe capable of handling aggressive gases and liquids at temperatures from -60°C to +260°C, with positive pressure up to 1.6 MPa and vacuum service down to 77 KPa. Available from 1" to 8" diameter and in lengths up to 4000 mm, these composite pipes are trusted by chemical, petrochemical, and pharmaceutical buyers who need long-term corrosion resistance in the most demanding media. Get a quote in 2 business hours →
PTFE Steel-Plastic Composite Pipe – The Best of Steel and Fluoropolymer in One Product
When your process involves aggressive chemicals at elevated temperatures, ordinary steel pipes fail quickly and pure plastic pipes cannot handle the pressure. Kaxite PTFE Steel-Plastic Composite Pipe solves both problems by tightly bonding a ram-extruded PTFE liner into a steel outer shell. The steel carries the pressure and mechanical loads; the PTFE liner isolates the media from the metal, eliminating corrosion and extending pipe life by years.
Our composite pipes are manufactured using a proprietary process that presses the PTFE tube tightly against the inner wall of the steel pipe, creating a permanent, inseparable bond. This allows the pipe to handle positive pressures up to 1.6 MPa and negative pressures down to 77 KPa, with a working temperature range of -60°C to +260°C. Diameters from 1" to 8" and lengths up to 4000 mm cover most industrial piping requirements.
Chemical plants, petrochemical refineries, pharmaceutical manufacturers, and water treatment facilities use these pipes to transport corrosive gases and liquids that would quickly destroy ordinary steel or stainless steel piping. Send us your piping specification and our engineering team will quote within 2 business hours, with material recommendations and pressure ratings for your specific process conditions.
Why Buyers Choose Kaxite PTFE Steel-Plastic Composite Pipe
- ✅ Tight PTFE-Steel Bond – Ram-extruded PTFE tube pressed into steel shell with no gaps or voids.
- ✅ Handles Pressure and Vacuum – Positive pressure up to 1.6 MPa; negative pressure down to 77 KPa.
- ✅ Wide Temperature Range – Continuous service from -60°C to +260°C.
- ✅ Excellent Corrosion Resistance – PTFE liner resists nearly all acids, bases, solvents, and oxidizing agents.
- ✅ Rigid Yet Chemically Inert – Steel shell provides structural strength; PTFE liner protects against media attack.
- ✅ Smooth Bore – Low friction coefficient reduces pressure drop and prevents media buildup.
- ✅ Wide Size Range – 1" to 8" diameter, lengths up to 4000 mm.
- ✅ Full Dimensional Inspection – Every pipe is checked before shipment; test reports available on request.
FIELD EXPERIENCE
Proven in Real Chemical Service – What Our Customers Report
Kaxite PTFE Steel-Plastic Composite Pipes have been installed in dozens of corrosive chemical service lines across Asia, the Middle East, and Europe. Below are three anonymized examples from our service records — each demonstrates how the composite pipe outperformed the previous piping solution.
Case 01 · Chlor-Alkali Plant, Shandong
Application: wet chlorine gas transfer, 85°C, 0.8 MPa. Replaced carbon steel piping that failed every 8-10 months. After 18 months of continuous service, inspection showed no liner delamination, no wall thickness loss, and no chloride-induced corrosion on the internal surface.
Case 02 · Pharmaceutical API Line, Zhejiang
Application: high-purity hydrochloric acid dosing, 40°C, 0.6 MPa. Client required zero metal ion contamination. Selected PTFE-lined composite pipe with flanged ends. Passed FDA-compliant purity validation and has been operating continuously for over 2 years without any media contamination events.
Case 03 · Sulfuric Acid Transfer, Jiangsu
Application: 98% sulfuric acid at 60°C, 1.0 MPa. Previous stainless steel 316L line corroded within 14 months. PTFE composite pipe has now been in service for 4+ years with no maintenance intervention, and remains within original dimensional tolerances.
* Customer names withheld for confidentiality. Full case documentation available to qualified buyers upon request.
PTFE Steel-Plastic Composite Pipe – ram-extruded PTFE liner tightly bonded inside the steel pipe shell
Technical Specifications – PTFE Steel-Plastic Composite Pipe
| Parameter | Value / Range |
|---|---|
| Product Name | PTFE Steel-Plastic Composite Pipe |
| Liner Material | Virgin PTFE (ram-extruded tube) |
| Shell Material | Carbon Steel, Stainless Steel 304/316, or other alloys on request |
| Size Range | 25 mm (1") to 200 mm (8") nominal diameter |
| Pipe Length | Up to 4000 mm per section (custom lengths available) |
| Liner Thickness (S2) | 2 mm to 4.5 mm (depending on pipe size) |
| Wall Thickness (S1) | 3.5 mm to 4.5 mm (depending on pipe size) |
| Operating Temperature | -60°C to +260°C |
| Pressure Rating (Positive) | Up to 1.6 MPa |
| Pressure Rating (Negative) | Up to 77 KPa |
| End Connection | Flanged, threaded, or butt-welded as per customer requirement |
| Applicable Standard | ASTM F1545, HG/T 20538, or custom drawings |
* Custom liner thickness, shell materials, pipe lengths, and end connections are available. Send us your piping drawing for an accurate quotation.
Dimensions Chart – PTFE Steel-Plastic Composite Pipe
The table below shows standard dimensions for Kaxite PTFE Steel-Plastic Composite Pipes. Custom sizes and liner thicknesses are available on request.
| Dg Diameter (mm / inch) | S1 Steel Wall (mm) | S2 PTFE Liner (mm) | D Bore (mm) | F Flange OD (mm) | L Max Length (mm) |
|---|---|---|---|---|---|
| 25 (1") | 3.5 | 2 | 21 | ≥55 | ≤4000 |
| 32 (1-1/4") | 3.5, 4 | 2 | 28 | ≥68 | ≤4000 |
| 40 (1-1/2") | 3.5 | 2 | 36 | ≥80 | ≤4000 |
| 50 (2") | 4 | 2 | 46 | ≥90 | ≤4000 |
| 65 (2-1/2") | 4.5 | 2.5 | 60 | ≥105 | ≤4000 |
| 80 (3") | 4.5 | 2.5 | 75 | ≥125 | ≤4000 |
| 100 (4") | 4.5 | 3 | 94 | ≥150 | ≤4000 |
| 125 (5") | 4.5 | 3.5, 4 | 117 | ≥185 | ≤4000 |
| 150 (6") | 4.5 | 4 | 142 | ≥215 | ≤4000 |
| 200 (8") | 4.5 | 4, 4.5 | 191 | ≥280 | ≤4000 |
* Dg = nominal diameter; S1 = steel pipe wall thickness; S2 = PTFE liner thickness; D = inner bore diameter; F = flange outside diameter; L = pipe length. Custom dimensions and larger diameters available on request.
PTFE Steel-Plastic Composite Pipe – flanged ends and production quality control
Liner Material Selection Guide
The standard PTFE liner handles most industrial chemicals. For specific media, temperature, or purity requirements, PFA and FEP liners are also available.
| Liner Material | Max. Temperature | Chemical Resistance | Best For |
|---|---|---|---|
| PTFE | 260°C | Excellent against most chemicals | General chemical service, acids, bases |
| PFA | 260°C | Similar to PTFE, better flexibility | High-purity service, semiconductor, pharma |
| FEP | 200°C | Good chemical resistance | Food & beverage, pharmaceutical |
* Consider permeation, thermal cycling, and vacuum service when selecting a liner. Our engineers are happy to recommend the right grade for your media.
Typical Applications
Chemical Processing Transfer lines for aggressive acids, alkalis, solvents, and oxidizing agents at elevated temperatures.
Petrochemical Sour gas, hydrocarbon streams, and corrosive process media at high temperatures.
Pharmaceutical High-purity fluid transfer where media contamination must be avoided.
Chlorine & Chloride Service Wet chlorine gas, hydrochloric acid, and hypochlorite transfer where ordinary steel fails quickly.
Water Treatment Dosing and distribution lines for chlorine, acids, and coagulants.
Pulp & Paper Chlorine dioxide, bleaching agents, and corrosive slurries at high temperature.
Quality Assurance & Certifications
Kaxite PTFE Steel-Plastic Composite Pipes are manufactured in our ISO 9001:2015 certified facility in Ningbo, China. Every pipe passes through the following quality gates before shipment:
- ISO 9001:2015 quality management
- ASTM F1545 manufacturing compliance
- 100% dimensional inspection
- Liner thickness verification
- Spark testing for liner integrity
- Hydrostatic pressure testing
- Full material traceability (EN 10204 3.1/3.2)
- Third-party inspection on request (SGS, BV, TÜV)
Packaging & Shipping
Each PTFE Steel-Plastic Composite Pipe is protected with end caps to prevent damage to the liner during transport. Pipes are bundled, stacked on heavy-duty wooden pallets or packed in wooden cases, and secured for sea, air, or rail freight. Custom marking and packing lists are available for bulk orders.
* Shipping method: by sea, train, or air – we optimise logistics for cost and speed.
Why Choose Kaxite for PTFE Steel-Plastic Composite Pipe?
Over 30 Years of Manufacturing Experience – Proven track record supplying lined piping products to demanding industrial buyers.
Full ASTM F1545 Compliance – Composite pipes manufactured and tested to recognized international standards.
Custom Engineering – Non-standard diameters, liner thicknesses, and end connections made to your drawings.
Factory-Direct Pricing – No middleman markup; you buy direct from the manufacturer.
Fast Lead Times – Standard sizes in stock; custom orders in 7-15 days.
Engineer-Level Support – Free consultation on liner selection, pressure ratings, and installation.
Field-Proven Reliability: Kaxite PTFE Steel-Plastic Composite Pipes are installed in critical applications worldwide, delivering reliable corrosion-resistant performance in chemical plants, refineries, and pharmaceutical facilities.
Frequently Asked Questions
- Q: What is a PTFE Steel-Plastic Composite Pipe used for?
- A: PTFE Steel-Plastic Composite Pipe is used to transport corrosive gases and liquids that would attack ordinary steel piping. The steel outer shell provides pressure and mechanical strength, while the PTFE liner isolates the media from the metal surface. Common applications include hydrochloric acid transfer, wet chlorine gas service, and pharmaceutical high-purity fluid lines.
- Q: How is the PTFE liner bonded to the steel pipe?
- A: We use a high-quality ram-extruded PTFE tube and a special processing technology that presses the tube tightly into the steel pipe shell, creating a permanent mechanical bond with no gaps or voids. This allows the pipe to handle both positive pressure (up to 1.6 MPa) and vacuum (down to 77 KPa).
- Q: What size range and length do you offer?
- A: Standard diameters range from 25 mm (1") to 200 mm (8"). Pipe sections are available up to 4000 mm in length. Custom sizes and lengths outside this range can be produced on request.
- Q: What is the operating temperature range?
- A: The PTFE Steel-Plastic Composite Pipe is suitable for continuous service from -60°C to +260°C, depending on the liner material selected and specific application conditions.
- Q: What end connections are available?
- A: We offer flanged, threaded, and butt-welded ends as standard. Flange drilling can be to ANSI, DIN, JIS, or your own bolt pattern. Send us your piping drawing for the exact configuration you need.
- Q: Can you produce composite pipes with PFA or FEP liners?
- A: Yes. Besides PTFE, we also produce composite pipes with PFA and FEP liners for high-purity, flexible, or specific temperature applications. Send us your media details and our engineers will recommend the right liner.
- Q: What is the typical lead time?
- A: Standard sizes ship within 3-5 days when in stock. Custom sizes, liner thicknesses, or special shell materials typically require 7-15 days depending on quantity and material availability.
Technical review: This page was reviewed by the Kaxite Engineering Team, Ningbo, China — specialists in PTFE lining and corrosion-resistant fluid handling with over 30 years of combined experience in chemical, petrochemical, and pharmaceutical piping applications. Last updated: 2026.
Ready to order or need technical advice? Send your piping specification and our engineering team will respond within 2 business hours with pricing and material recommendations.
Partner with Kaxite Sealing – your reliable supplier of PTFE Steel-Plastic Composite Pipe. With decades of experience, a wide range of liner materials, and a commitment to quality, we deliver composite piping solutions that ensure safety, reliability, and compliance in the most demanding industrial applications. Request a free design review or get a bulk quote today.
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