CF6794 Basalt Direct Untwisted Roving

Basalt Direct Untwisted Roving Description

This advanced untwisted Roving consists of continuous, parallel basalt filaments (9-17 μm diameter) for optimal resin penetration and mechanical bonding. Proprietary multi-resin silane sizing - including γ-Glycidoxypropyltrimethoxysilane - forms covalent Si-O-C bonds with thermosetting matrices, achieving an interfacial shear strength of over 45 MPa.

The amorphous mineral structure provides exceptional thermal load capacity, maintaining tensile strength from -260°C to +700°C, which is critical for fire-resistant linings and thermal cycling in aerospace applications. With a tensile modulus of 91-100 GPa (25% higher than E-Glass) and controlled elongation (2.8-3.3%), it prevents brittle failure under seismic loads.

A moisture absorption of nearly zero (<0.1%) prevents hydrolysis in marine environments, with strength retained at 80% after 7.5 years in seawater. Enhanced resistance to acids and alkalis, self-extinguishing properties (LOI >75%), and an extremely low fuzz content (≤10 mg/kg) enable knot-free weaving and rapid resin infusion (<60 seconds for epoxy). These characteristics result in composites with a 50% higher flexural modulus and double the fatigue life compared to glass equivalents while reducing CO₂ emissions by 30%.

Basalt Direct Untwisted Roving Applications

Seismic infrastructure: Reinforcement of concrete columns and bridge girders with 40% higher load-bearing capacity and crack resistance. Prevents steel corrosion in chloride-rich environments and reduces construction weight by 70%.

Marine and offshore engineering: Laminates for ship hulls reduce maintenance costs by 60% due to seawater resistance. Offshore platforms triple their lifespan in saline environments due to UV/hydrolysis resistance.

High-temperature structures: Tunnel linings withstand 700°C for 2 hours with phenolic resins. Radomes for aerospace applications combine radar transparency and flame resistance (LOI >75%) for rocket casings.

Sustainable construction: Filament-wound CNG/H₂ tanks withstand pressures of 700 bar with minimal creep and have a 30% lower CO₂ footprint than alternatives made of steel.

Basalt Direct Untwisted Roving Packaging

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

Packaging: Carton, wooden crate, or custom-made.

Please refer to 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 property 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 testing.

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

For detailed information, please refer to the SAM testing procedures.

Basalt Direct Untwisted Roving FAQs

Q1. Why is an untwisted structure important for seismic applications?

Parallel filaments eliminate twisting-related stress concentrations, enhancing energy absorption during seismic events and increasing interfacial shear strength by 40%, which is crucial for ductile failure modes in reinforced concrete.

Q2. How does it surpass steel reinforcement?

It offers 25% higher tensile strength (0.68 N/tex compared to 0.48 N/tex for steel), prevents corrosion in chloride-laden environments, reduces weight by 70% to lower seismic inertia forces, and requires no electrochemical maintenance.

Q3. Which resin systems are compatible?

Optimised for epoxy resin (60-second wet-out time), vinylester (bonding in marine applications), and phenolic resin (fire-resistant applications). The proprietary silane sizing forms covalent Si-O-C bonds in all thermosetting matrices.

Related Information

1.common preparation methods

1. Processing of raw materials: Highly pure basalt ore (Fe₂O₃ <9.5%) is crushed, magnetically cleaned, and washed to obtain granules of 5-20 mm size.

2. Fibre formation: The granules melt in gas/electric furnaces (1,460-1,500°C). The molten lava extrudes through platinum-rhodium orifices (holes of 9-17 μm) to form filaments, which solidify through air cooling to obtain an amorphous structure.

3. Application of sizing: The filaments pass through an aqueous bath (60-80 °C) containing epoxy/phenolic silane (e.g., γ-Glycidoxypropyltrimethoxysilane) and are encapsulated into monofilaments via dip rollers.

4. Roving assembly: The fibres are gathered into untwisted bundles under micro-tension (15-25 N). The linear density is calibrated to 600-4,800 Tex through the number of nozzle openings and control of winding speed.

5. Thermal crosslinking: Glass strands dried (100-120°C) and cured in ovens (130-150°C, 30-50 min) to activate the resin bonding sites. Laser diameter controls (±0.5 μm) ensure consistency.

6. Packaging: Perforated spools wound under nitrogen; aluminium bags with moisture barriers ensure 12-month storage stability.