Product Description
Related solutions: Explore our FRP rebar, pultruded FRP profiles, pultrusion machines, pultrusion dies.
Our 4mm Fiber Reinforced Polymer (FRP) rebar is engineered as an alternative to steel reinforcement for concrete structures. This small-diameter composite rebar combines fiberglass, basalt, or carbon fibers with specialized polymer resins to create a reinforcement solution that performs well in challenging environments where steel can deteriorate. The 4mm FRP rebar features strong corrosion resistance against saltwater, chemicals, and harsh weather, making it suitable for coastal construction projects and waterfront infrastructure reinforcement. With its strong tensile strength-to-weight ratio, this thin composite rebar provides strong reinforcement while being approximately 75% lighter than steel rebar of equal diameter, reducing transportation costs and installation labor requirements. Our 4mm glass fiber reinforced polymer rebar is suitable for concrete slabs, pathways, and non-structural applications where thin-profile reinforcement is needed. The non-conductive properties of our fiberglass rebar make it a suitable choice for electromagnetic-sensitive installations like hospital MRI rooms and electrical transformer stations where steel’s conductivity would create interference. Each production batch of our 4mm FRP reinforcement undergoes extensive tensile strength testing and dimensional verification to ensure consistent quality and reliable performance in every construction application. Our dedicated technical support team offers comprehensive assistance throughout your project, from initial material selection to final installation guidance.
Technical Specifications
| Specification | Details |
|---|---|
| Exact Diameter | 4mm (±0.2mm manufacturing tolerance) |
| Core Material Options | Fiberglass (GFRP), Basalt (BFRP), Carbon (CFRP) |
| Surface Profile | Sand-coated or helically wound for optimal concrete bonding |
| Ultimate Tensile Strength | 900-1200 MPa (high tensile strength) |
| Unit Weight | 0.04 kg/meter (approximately 75% lighter than steel rebar of equal diameter) |
| Available Standard Lengths | 1m, 6m, 12m (custom cut lengths available upon request) |
| Elastic Modulus | 40-50 GPa (varies by fiber composition) |
| Temperature Performance | -60°C to +150°C operational range |
| Electrical Properties | >10^10 Ω·cm resistivity (electrically non-conductive) |
| Ultraviolet Resistance | good with UV-protective surface coating |
| Chemical Durability | Resistant to chlorides, acids, alkalis, and salt environments |
| Thermal Expansion | 6-10 x 10^-6/°C (similar to concrete) |
Applications & Use Cases
Marine & Coastal Construction Applications
- Saltwater-exposed concrete seawalls and jetties with extended service life
- Concrete pier foundations in tidal zones with minimal maintenance over long service life
- Coastal boardwalks and fishing platforms requiring minimal long-term maintenance
- Small harbor infrastructure projects subjected to constant splash zone exposure
- Concrete boat ramps and marine access points where corrosion resistance is critical
Chemical & Industrial Environment Applications
- Wastewater treatment plant containment structures and channels
- Chemical processing facility floors and supports exposed to corrosive substances
- Concrete acid tanks and chemical containment structures
- Desalination plant infrastructure with constant saltwater exposure
- Laboratory floors requiring electromagnetic interference protection
- Lightweight precast concrete elements for industrial applications
Specialized Small-Diameter Reinforcement Applications
- Thin concrete slabs and overlays requiring minimal cover thickness
- Decorative concrete elements where thin reinforcement is aesthetically necessary
- Lightweight precast concrete panels for facades and architectural features
- Non-magnetic reinforcement for hospital MRI rooms and sensitive equipment areas
- Municipal sidewalks and pathways in snow regions exposed to de-icing salts
- Concrete road barriers and highway sound barriers in corrosive environments
- Thin-section concrete with limited cover depth requirements
Product Advantages & Features
Value Comparison: 4mm FRP Rebar vs. 4mm Steel Rebar
4mm FRP rebar is approximately 75% lighter than steel rebar of equal diameter, does not corrode, and is electrically non-conductive. These characteristics can reduce transport, handling, and lifecycle maintenance costs. Contact us for project-specific TCO guidance.
Key Performance Benefits for 4mm Composite Rebar
- Strong corrosion resistance in harsh environments: Unlike steel that requires costly protective measures, our 4mm fiberglass rebar offers high resistance to rust, corrosion, and degradation even in aggressive saltwater, chemical, and high-humidity conditions. This helps reduce concrete spalling associated with corroded steel.
- Lightweight design for easier handling: At just 0.04 kg per meter (approximately 75% lighter than steel rebar of equal diameter), our 4mm GFRP rebar reduces transportation costs, reduces heavy lifting equipment requirements, and allows faster installation with reduced worker fatigue.
- High tensile strength in a small diameter: Our 4mm FRP reinforcement provides 900-1200 MPa tensile strength, allowing designers to maintain structural integrity while using smaller diameter reinforcement that requires less concrete cover in thin-section applications.
- Potential lifecycle savings: Independent accelerated aging tests verify our 4mm composite rebar maintains 95% of initial tensile strength after simulated 100-year exposure to alkaline concrete environments, outperforming steel’s 25-40 year lifespan in corrosive settings.
- Electrical and thermal insulation: Our 4mm FRP rebar provides low electromagnetic conductivity with low conductivity, making it ideal for sensitive healthcare equipment installations, electronic manufacturing facilities, and applications where preventing thermal bridging or electromagnetic interference is critical.
Frequently Asked Questions About 4mm FRP Rebar
Q: What makes 4mm FRP rebar better than traditional steel for small concrete projects?
A: Our 4mm FRP rebar provides Strong corrosion resistance in harsh environments, weighs much less than steel rebar of equal diameter for easier handling, offers high tensile strength, and delivers long service life with low maintenance. For small concrete projects, it reduces rust staining, reduces cracking from thermal expansion differences, and allows thinner concrete sections with less cover requirements.
Q: How does the total cost of 4mm FRP rebar compare to 4mm steel reinforcement?
A: While the initial material cost of our 4mm FRP rebar may be 15-20% higher than steel, the total project cost typically becomes 10-15% lower when factoring in significant labor savings (installation is 30% faster), reduced transportation expenses (75% lighter), eliminated protective coatings, and minimal maintenance costs over the structure’s lifetime.
Q: Can your 4mm FRP rebar be bent or shaped on-site like steel rebar?
A: Unlike steel, our 4mm FRP rebar cannot be bent on-site after manufacturing due to the composite fiber structure. For applications requiring non-straight reinforcement, we offer pre-bent shapes, stirrups, and custom-formed reinforcement configurations manufactured to your exact specifications. Our extensive catalog includes standard shapes for common applications.
Q: Is your 4mm fiberglass rebar approved for use in structural concrete applications?
A: Our 4mm FRP reinforcement complies with ACI 440.1R guidelines for FRP reinforcement in concrete structures and is approved for use under most international building codes with appropriate engineering design. It meets or exceeds the requirements of ASTM D7957 for composite reinforcement bars, and we provide full technical documentation for plan approval in any jurisdiction.
Q: What’s the proper spacing for 4mm FRP rebar compared to steel in concrete pathways?
A: For typical concrete pathway applications (100mm thick), our 4mm FRP rebar is recommended at 150-200mm spacing (compared to 250-300mm for steel) to account for the different elastic modulus while maintaining equivalent crack control performance. For specific applications, we offer a free design consultation service where our engineers can provide exact spacing recommendations based on your project’s loading requirements and environmental conditions.
Q: How do you install 4mm FRP rebar in thin concrete sections?
A: Our 4mm FRP rebar installs similarly to steel but requires plastic zip-ties or non-metallic wire at intersections instead of wire ties. For thin concrete sections, the smaller diameter allows for proper cover (minimum 15mm) while maintaining structural integrity. Cut using a diamond blade or abrasive cutoff wheel rather than bending to length. Our comprehensive installation guide provides step-by-step instructions for optimal results in thin concrete applications.
Q: Will 4mm FRP rebar float in wet concrete during pouring?
A: Due to its lightweight nature, proper securing of 4mm FRP rebar is essential to prevent flotation. We recommend using more frequent tie points (every 0.5m), adding temporary weights during pouring, or using our specially designed plastic chairs with locking features that prevent movement during concrete placement. Following our installation guidelines ensures proper positioning throughout the concrete pour.
Request a quote: Need this product for your project? Contact us for a quote — our engineering team can help with specifications, custom sizes, and bulk orders.
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