Overview
Plastic lining materials for pipes are engineered polymers applied to the interior surfaces of metal pipes to create a protective barrier. These materials are selected for their ability to resist corrosion, chemical attack, and abrasion while maintaining structural integrity under operational stresses. Common base polymers include polyethylene (PE), polypropylene (PP), polytetrafluoroethylene (PTFE), and fluorinated ethylene propylene (FEP). The lining process typically involves either rotational lining for thermoplastic materials or spray-applied thermosetting resins. The choice between these methods depends on pipe dimensions, service conditions, and required liner thickness (usually 2-10mm). Industrial standards such as ISO 21809-3 and ASTM F1545 govern material selection and application protocols.
Physical and Chemical Properties
These materials exhibit excellent dielectric properties with volume resistivity exceeding 10¹⁵ Ω·cm, making them ideal for preventing electrochemical corrosion. Thermal expansion coefficients range from 50-200 × 10⁻⁶/°C, requiring careful consideration in high-temperature cycling applications. Most formulations maintain mechanical stability between -40°C to +150°C, with specialized grades reaching 260°C. Chemical resistance varies by polymer type: PTFE linings resist virtually all chemicals except molten alkali metals, while polyolefins (PE/PP) offer cost-effective protection against acids and bases up to 60°C. Abrasion resistance, measured by Taber abrasion tests, typically shows weight losses below 10mg/1000 cycles under CS-10 wheels with 1kg load.
Main Applications
In chemical processing industries, these linings protect piping systems carrying aggressive media like hydrochloric acid (up to 30% concentration at 50°C for PP linings) and chlorine solutions. Oil and gas applications utilize them in flowlines handling produced water with high H₂S content (NACE MR0175 compliant formulations available). The water treatment sector employs plastic-lined pipes for sludge transportation and desalination plants, where chloride resistance is critical. Food-grade applications (FDA-compliant materials) include dairy processing lines and breweries. Emerging uses include lithium-ion battery electrolyte handling and semiconductor wet process piping, requiring ultra-high purity linings with less than 1ppb contaminant release.
Safety and Storage
Raw polymer materials should be stored in original packaging below 30°C with relative humidity under 60%. Bulk powders require explosion-proof facilities due to dust explosion risks (minimum ignition energy often below 30mJ). Thermal decomposition products may include hydrogen fluoride (for fluoropolymers) or formaldehyde (for acetals), necessitating adequate ventilation during processing. Installed linings require regular inspection for mechanical damage (recommended every 12-36 months depending on service). Common failure modes include liner collapse due to vacuum conditions (design threshold typically -0.5 bar gauge) or permeation blistering from trapped volatiles. Pressure ratings generally range from full vacuum to 16 bar at 20°C, decreasing to 4 bar at 100°C for most thermoplastics.
B2B Procurement Guide
When sourcing pipe lining materials, buyers should request certified test reports for: 1) chemical resistance per ASTM D543, 2) bond strength (minimum 5MPa for spray-applied linings), and 3) holiday detection results (no defects at 15kV/mm test voltage). OEM approvals (such as Shell DEP or BASIEC) add credibility for critical applications. Bulk purchases (20+ metric tons) typically secure 8-15% discounts. Just-in-time delivery is preferable for moisture-sensitive materials like polyamides. For international shipments, ensure compliance with transport regulations (UN 3077 for most solid polymers). Technical support should include lining procedure specifications and weld overlay recommendations for field repairs.
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