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Technical Data
Discover high-strength fiberglass rectangular tubes from Zhongsheng. Engineered via continuous pultrusion for superior structural load capacities, complete corrosion resistance, and high electrical insulation. Contact us for custom dimensions.
Customized service:
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Zhongsheng premium-grade fiberglass rectangular tubes (also engineered as frp rectangular tubes or composite box sections) represent the apex of modern structural engineering profiles. Manufactured using our advanced continuous pultrusion technology, these hollow profiles are meticulously fabricated by pulling high-density continuous glass fiber rovings and multidirectional fabrics through a heated steel forming die injected with premium thermosetting resins. This optimized engineering process results in a structural profile with incredible longitudinal tensile strength and unparalleled structural stability.
The specialized four-sided flat geometry of fiberglass rectangular tubing provides vastly superior bending resistance along its major axis, making it an excellent choice over standard round profiles for structural beams, joists, and frameworks. Designed as a direct, permanent replacement for highly corrosive carbon steel, heavy stainless steel, and warping timber, our composite box sections significantly reduce long-term structural maintenance overheads across global industrial networks.
The matrix below showcases our standard technical dimensions for pultruded rectangular composite hollow profiles. Our direct-to-factory facility supports full customization of wall thicknesses, precise cross-sectional dimensions, resin formulations (Isophthalic Polyester, Vinyl Ester, or Polyurethane), and fire-retardant classes to meet your exact structural engineering layouts.
| Specification | Unit | Value |
| Length | mm | 1000~6000 |
| Width | mm | 25~100 |
| Thickness | mm | 3~6 |
| Color | - | Customized |
| Surface | - | Smooth or textured |
| Parameter | Unit | Value |
| Density | g/cm3 | 1.8-2.0 |
| Tensile strength | MPa | 300-500 |
| Compressive strength | MPa | 200-400 |
| Flexural strength | MPa | 300-500 |
| Modulus of elasticity | GPa | 20-40 |
| Thermal conductivity | W/mK | 0.25-0.35 |
| Coefficient of thermal expansion | 1/K | 8-12 x 10^-6 |
Due to their advanced mechanical design and flat modular connection surfaces, Zhongsheng fiberglass rectangular tubes are heavily integrated across various industrial sectors:
Every structural batch of Zhongsheng composite rectangular profiles is produced under strict ISO 9001 protocols. Our quality control lab conducts meticulous checking processes including ASTM mechanical property tests, fiber distribution verification, and dimensional accuracy tests, ensuring that our products arrive on your project site perfectly optimized for continuous heavy-duty deployment.
Executive Summary: Zhongsheng high-strength fiberglass rectangular tubes (also recognized as frp rectangular tubes) are advanced, heavy-duty hollow profiles engineered via continuous pultrusion technology to solve major structural load and severe corrosion challenges across modern industrial infrastructure. Characterized by an outstanding strength-to-weight ratio and a specialized four-sided flat geometry, these composite box sections provide vastly superior bending and shear resistance along their major axes compared to standard round profiles. They deliver complete immunity to acid splash, oxidation, and saltwater deterioration, while maintaining excellent dielectric insulation and minimal thermal conductivity. Serving as a permanent, zero-maintenance replacement for carbon steel, stainless steel, and warping timber in cooling towers, chemical processing plants, and marine decking support systems, Zhongsheng fiberglass rectangular tubing can be custom-fabricated in precise wall thicknesses and customized resin variants to match elite structural engineering blueprints worldwide.
| Structural Engineering Matrix | Zhongsheng Fiberglass Rectangular Tube | Structural Carbon Steel (A36) | Structural Treated Timber |
|---|---|---|---|
| Bending & Structural Load Efficiency | Excellent (High major-axis modulus) | Very High (Extremely Heavy) | Low (Splits under tension) |
| Corrosion, Acid & Rust Immunity | 100% Immune (Zero oxide layers) | Extremely Poor (Rapid rust) | Poor (Prone to rot and termites) |
| Dead Weight Ratio (Steel = 100%) | Approx. 25% (Ultra-Lightweight) | 100% (High transportation overhead) | Approx. 15% |
| Electrical & Galvanic Isolation | Excellent Dielectric Insulation | Highly Conductive (Hazardous) | Good (When dry only) |
| Life-Cycle Maintenance Costs | Absolute Zero (No painting required) | Extremely High (Continuous galvanizing) | High (Frequent sealants/replacements) |
A1: A pultruded fiberglass rectangular tube features a higher cross-sectional moment of inertia, providing vastly superior structural resistance against bending, vertical deflection, and downward load forces along its major axis. Furthermore, the four flat, flush surfaces dramatically simplify structural bolting, gusset plate alignment, and seamless joint integration with other load-bearing pultruded fiberglass profiles.
A2: Every high-strength frp rectangular tube batch is produced under strict ISO 9001 quality compliance. We use an automated continuous thermal pultrusion sequence that guarantees dense fiber consolidation and uniform wall profiles. For specific commercial layouts, we infuse specialized halogen-free fire retardants directly into the thermosetting matrix to comfortably meet stringent ASTM E84 Class A flame spread certifications.
A3: Yes, absolutely. Unlike carbon steel profiles that corrode instantly or aluminum that experiences galvanic oxidation, our fiberglass composites are entirely immune to water, chemical splashes, and acidic vapors. By utilizing premium-grade Vinyl Ester resins during the continuous manufacturing process, we deliver elite-tier corrosion barriers that are engineered to survive over 30 years inside highly aggressive chemical processing towers and marine offshore platforms.
A4: Metals exhibit very high thermal conductivity, causing immense energy loss and severe thermal bridging in exterior structures. Our structural polymer composites possess a exceptionally low thermal conductivity index. This superior insulation performance completely eliminates thermal bridging, making our tubes heavily specified in refrigeration facilities, intense outdoor enclosures, and energy-efficient building structures.
A5: Yes. Zhongsheng is a direct industrial manufacturing pioneer equipped with complete in-house tooling workshops. We can adjust wall thicknesses, engineer bespoke glass fiber orientations for advanced load distribution, and customize final lengths or custom colors. Please reach out to our industrial engineering desk to align your architectural layouts with our premium selection of structural shapes and pultruded fiberglass profiles optimized for engineering deployments.
We are both manufacturer trading and company. We have our own factory and we have better service ofoverseas customers. Welcome to send your inquiry!
We can supply a few pieces FREE samples if we have some in stock, and you only need to pay the freight cost by yourself. Welcome to send your inquiry for FREE samples!
10-15days after receiving the deposit based on the MOQ. Normally, 30-35days to finish the order for a 20ft container. Welcome to ask for the detailed delivery time according to your order quantity!
Our whole production lines and products have been certificated by IS09001:2015, and it's been followed strictly. We also have the professional QC team, and each our package worker will be in charge of the final inspection according to the QC instruction before packing.
Basically, the payment terms areT/T,L/C at sight. Western Union, Paypal, Moneygram, Alipay Credit card are acceptableforsample order.
We accept all OEM orders,just contact us and give me your design,we will offer you a reasonable price ASAP.
The quality of the product is very good, all performance tests have passed, and the service attitude of the docking staff is very good
ClydeEngineer, From india
Compared with our local products, the quality of this batch of profiles is quite good, it is worth recommending
DevinCEO, From Germany
The engineer has comprehensive professional knowledge, answered many questions, and put forward many useful suggestions, which made the plan more perfect
AaronCTO, From Mexico
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Email: Jessica@frpzs.com
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