KOXY's plastic lined steel pipes are made from food-grade polypropylene and other plastic materials, manufactured through cold drawing or rotational molding processes. They offer superior resistance to corrosion, abrasion, and chemical degradation in harsh environments. For different pipe sizes, appropriately sized grooves are incorporated to facilitate the positioning and pressing of the internal retaining rings, restricting their position and forming internal reinforcing ribs. These pipes are widely used in various fields, including chemical transport, water supply systems, and industrial processes where high corrosion resistance is crucial.
Performance Advantages Combination of Mechanical and Corrosion Resistance:Integrates the mechanical strength and impact resistance of steel pipes with the corrosion resistance of plastic, avoiding easy rusting of steel pipes and extending service life.
Wide Chemical Compatibility: Suitable for transporting various chemicals, water, and aggressive fluids.
Flexible Lining Options: Customizable plastic linings, including PVC, PE, PP, and PTFE, to meet specific operational needs.
Cost-Effective: Reliable and affordable solution for industries requiring chemical resistance.
Excellent Hygienic Performance: The food-grade inner lining is less prone to microbial growth even after slow scaling, making it suitable for transporting media such as domestic water.
Low Water Flow Resistance:The smooth inner wall reduces hydraulic resistance, minimizes scaling, and solves pipeline blockage problems.
Stability and Durability:The internal fixing rings prevent issues like detachment or damage of the plastic lining during processing and use. The composite pipes feature multiple protections from the internal fixing rings, plastic layer, and galvanized steel substrate, ensuring long service life.
→ Chemical transport and processing
→ Water treatment plants
→ Petrochemical pipelines
→ Food and beverage industries
→ Industrial fluid transport
Technical Specifications | Nominal Diameter | Nominal Outer Diameter | Steel Pipe Wall Thickness | Lined Plastic Pipe Wall Thickness | Steel Pipe Length | |
| mm | in | mm | mm | mm | mm |
| 15 | 1/2 | 21.3 | 2.8 | 1.5±0.2 | 6000 |
| 20 | 3/4 | 26.9 | 2.8 | 1.5±0.2 | 6000 |
| 25 | 1 | 33.7 | 3.2 | 1.5±0.2 | 6000 |
| 32 | 11/4 | 42.4 | 3.5 | 1.5±0.2 | 6000 |
| 40 | 11/2 | 48.3 | 3.5 | 1.5±0.2 | 6000 |
| 50 | 2 | 60.3 | 3.8 | 1.5±0.2 | 6000 |
| 65 | 21/2 | 76.1 | 4.0 | 1.5±0.2 | 6000 |
| 80 | 3 | 88.9 | 4.0 | 2.0±0.2 | 6000 |
| 100 | 4 | 114.3 | 4.0 | 2.0±0.2 | 6000 |
| 125 | 5 | 139.7 | 4.0 | 2.0±0.2 | 6000 |
| 150 | 6 | 165.1 | 4.5 | 2.0±0.2 | 6000 |
| 200 | 8 | 219.0 | 6.0 | 2.5(0.0.5) | 6000 |
| 250 | 10 | 273.1 | 7.0 | 3.0(-0.5,+Unlimited) | 6000 |
| 300 | 12 | 323.9 | 8.0 | 3.0(-0.5,+Unlimited) | 6000 |
| 350 | 14 | 377 | 8.0 | 3.0(-0.5,+Unlimited) | 6000 |
| 400 | 16 | 426 | 8.0 | 3.0(-0.5,+Unlimited) | 6000 |

Application Fields
Certificates Our one-stop service covers the entire project lifecycle to save your time and costs:
Pre-sales: Technical consultation (e.g., selecting the right pipe material for corrosive environments, valve type for high-temperature systems);
Supply: Integrated product bundles (e.g., fire pipeline + fittings + valves + sprinklers) with unified specifications;
After-sales: Installation guidance (video tutorials or on-site support if needed), maintenance training, and replacement of defective parts;
Documentation: Unified shipping documents (commercial invoice, packing list, certificate of origin) to simplify customs clearance.
We offer flexible and secure payment terms tailored to international trade, including options for full payment and advance payment based on cooperation scenarios:
General scenario: Full payment acceptance
For most orders (e.g., new client first cooperation, standard product orders ≤$30,000), we accept full payment before shipment. This can be done via:
T/T (Telegraphic Transfer): 100% full payment to our designated bank account;
PayPal/Western Union: 100% full payment for small orders (≤$5,000) or sample orders.
Specific scenarios: Advance payment available
For specific cooperation cases, we support advance payment (partial prepayment) to reduce your upfront capital pressure, including:
Long-term cooperative clients (with 2+ successful previous orders): Advance payment of 30%-50%, and the remaining balance before shipment (via T/T);
Large orders (≥$50,000) or customized product orders (e.g., non-standard fire pipelines, special-pressure valves): Advance payment of 40%-60% (to cover raw material costs), and the remaining balance after production inspection but before shipment (via T/T or L/C);
Government/engineering project orders (with official procurement contracts): Advance payment of 20%-30% (subject to contract negotiation), and the remaining balance in installments based on shipment progress.
Other secure terms
L/C (Letter of Credit): Irrevocable L/C at sight issued by a first-class bank (available for both full payment and partial advance payment, preferred for large orders ≥$50,000);
Credit terms: 30-60 days credit for long-term trusted clients (after 3+ successful orders and credit verification, applicable to regular repeat orders).
The standard delivery cycle for overseas orders ranges from 25 to 45 working days. We offer diverse shipping options, including full container loads, less-than-container loads, and air freight express services. Our international logistics network covers major ports and airports worldwide. To facilitate swift customs clearance, we provide essential international certification documents, such as certificates of origin and commercial invoices. Leveraging our bonded warehouses in Hong Kong and Shenzhen, select Southeast Asian orders can be expedited with delivery within 7 to 10 days.
We enforce a global quality control system that surpasses national standards. Each batch undergoes rigorous testing, including raw material composition analysis, pressure burst tests, and salt spray corrosion resistance evaluations, accompanied by bilingual (Chinese-English) quality inspection reports. Based on project location requirements, we can furnish free certification documents for target markets, such as CE (European Union), UL (United States), and BIS (India). Furthermore, we support on-site inspections and remote video audits to ensure full transparency in the quality control process.
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