CF6796 Basalt Fiber Reinforced PE Composite Pipe

Basalt Fibre Reinforced PE Composite Pipe Description

The pipe consists of a three-layer co-extrusion structure: An internal HDPE liner provides a smooth, chemical-resistant liquid passage; the intermediate basalt fibre reinforcement (woven or spirally wound) offers axial and circumferential strength; and an external HDPE coating protects against UV radiation and abrasion. The basalt fibres, coated with maleic anhydride-grafted PE, form covalent bonds with the HDPE matrix, achieving an interfacial shear strength of >8 MPa, which is crucial for pressure integrity under cyclic loading.

Mechanically, the composite exhibits anisotropic strength characteristics: The circumferential tensile strength reaches 45-60 MPa (three times higher than that of pure HDPE), while maintaining axial flexibility with an extension of 12-15% to accommodate ground settlements. The basalt-HDPE combination reduces long-term creep strain at 20°C/0.8 MPa by 70%, thereby preventing blistering or sagging. Chemically, the HDPE matrix is insensitive to salts, acids (pH 1-14), and hydrocarbons, with permeation rates of <0.01 g-mm/m²-day for H₂S and CO₂.

Due to the low thermal expansion coefficient of basalt (8-9×10-⁶/K), the pipe retains 85% of its strength at 80°C (compared to 50% for GRP pipes). Under freezing conditions (-50°C), it resists brittle fracture from fibre-induced micro-cracking deformation. Because it is electrically non-conductive and has a dielectric strength of >25 kV/mm, the risk of stray current corrosion is eliminated. Field data confirm a lifespan of >50 years in mining slurries (abrasion loss <0.1 mm/year) and seawater discharge systems (no biofilm adhesion), with corrosion resistance three times higher than that of steel and a weight reduction in installation of 60%.

Basalt Fibre Reinforced PE Composite Pipe Applications

Industrial chemical transport: Handles 20% H₂SO₄ at 80°C in chemical facilities and abrasion-resistant mining slurries per ASTM G65 Level III, preventing corrosion-related downtime.

Marine infrastructure: Sea water inlet and outlet systems prevent chloride pitting, whilst ballast systems for offshore platforms achieve a weight reduction of 40% compared to steel.

Energy sector: Transports geothermal brine at 110°C/2 MPa and withstands H₂S/CO₂ permeation in oilfield produced water (API 15LE compliant).

Municipal engineering: Resists soils with a pH of 3-11 in aggressive drainage systems and ensures leak-free collection of landfill leachate through fusion welded connections.

Basalt Fibre Reinforced PE Composite Pipe Packaging

Our products are packaged in custom cartons of various sizes based on material dimensions. Smaller items are securely packaged in PP cartons, while larger items are placed in custom wooden crates. We ensure strict adherence to packaging specifications and the use of appropriate cushioning materials to provide optimal protection during transport.

Packaging: Carton, wooden crate, or custom.

Please see the packaging details for your information.

Manufacturing Process

1)Testing Procedures

(1)Chemical composition analysis - Verified using techniques such as GDMS or XRF to ensure compliance with purity requirements.

(2)Mechanical properties testing - Includes tensile strength, yield strength, and elongation tests to assess material performance.

(3)Dimensional testing - Measures thickness, width, and length to ensure compliance with specified tolerances.

(4)Surface quality testing - Inspection for defects such as scratches, cracks, or inclusions through visual and ultrasonic inspection.

(5)Hardness testing - Determination of material hardness to confirm uniformity and mechanical reliability.

For detailed information, please refer to the SAM Testing Procedures.

Frequently Asked Questions about Basalt Fibre Reinforced PE Composite Pipes

Q1. Why use basalt instead of GRP in PE pipes?

Basalt provides 25% higher tensile strength (0.68 N/tex versus 0.45 N/tex), prevents degradation from alkalies in cementitious fluids, and extends the operational range to -50°C-110°C compared to the -30°C-80°C limits of GRP.

Q2. How is thermal expansion controlled?

Fibre retention reduces axial movement by 60% compared to steel pipes (30-40×10-⁶/K CTE).

Q3. What connection methods ensure integrity?

Electrofusion welding provides a leak-proof seal through an internal HDPE layer; flange adapters facilitate integration into existing metal infrastructure.

Further Information

General Preparation Methods

1. Fibre treatment:

Basalt rovings (9-17 μm), coated with MAH-PE finish in a dip bath (70-85°C) to enhance HDPE bonding.

2. Co-extrusion:

Layer 1 (inner): HDPE granules are extruded at 180-220°C to form a smooth lining (1.5-3 mm).

Layer 2 (reinforcement): Coated fibres are woven/wound onto the liner in a molten state (tension: 15-25 N).

Layer 3 (outer): UV-stabilised HDPE extruded over the reinforcement (1-2 mm).

3. Solidification:

Pass through a vacuum calibration unit (0.08-0.1 MPa) to eliminate air inclusions.

Cooling in staged water baths (20-40°C) to secure crystallinity.

4. Quality control:

Burst pressure: ≥3× PN rating (ASTM D1599).

Leak testing: 24h hydrostatic pressure at 1.5× PN.

Ultrasonic testing: Detection of delaminations (>0.3 mm voids).