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Structural Profiles - Square Tube (Isophthalic)
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Greenlogy TEC
FRP pultruded profiles are a new type of composite material produced by using glass fiber reinforcement as the reinforcing phase, resin as the binder, and glass fiber cloth as the surface reinforcement layer. The reinforcement is fully impregnated, then heated, formed, and cured in a metal mold, and pulled through by a haul-off machine. The profiles have good physical properties and are widely used in high-strength and large-span applications.
Type | Size (mm) | Weight (kg/m) | Size (in) | Weight (lbs/in) |
|---|---|---|---|---|
Square Tube | A*B*T1*T2 | A*B*T1*T2 | ||
| ST25A | 25*25*3.2*3.2 | 0.53 | 1" x 1" x 1/8" x 1/8" | 1.17 |
| ST25B | 25*25*6.4*6.4 | 0.9 | 1" x 1" x 1/4" x 1/4" | 1.98 |
| ST32A | 32*32*3.2*3.2 | 0.7 | 5/4" x 5/4" x 1/8" x 1/8" | 1.54 |
| ST32B | 32*32*6.4*6.4 | 1.24 | 5/4" x 5/4" x 1/4" x 1/4" | 2.73 |
| ST38A | 38*38*3.2*3.2 | 0.85 | 3/2" x 3/2" x 1/8" x 1/8" | 1.87 |
| ST38B | 38*38*5*5 | 1.25 | 3/2" x 3/2" x 3/16" x 3/16" | 2.76 |
| ST38C | 38*38*6.4*6.4 | 1.54 | 3/2" x 3/2" x 1/4" x 1/4" | 3.4 |
| ST44A | 44*44*3.2*3.2 | 1.01 | 7/4" x 7/4" x 1/8" x 1/8"
| 2.23 |
| ST44B | 44*44*6.4*6.4 | 1.83 | 7/4" x 7/4" x 1/4" x 1/4"
| 4.03 |
| ST50A | 50*50*3.2*3.2 | 1.14 | 2" x 2" x 1/8" x 1/8" | 2.51 |
| ST50B | 50*50*3.5*3.5 | 1.24 | 2" x 2" x 1/8" x 1/8" | 2.73 |
| ST50C | 50*50*4*4 | 1.42 | 2" x 2" x 3/16" x 3/16"
| 3.13 |
| ST50D | 50*50*5*5 | 1.74 | 2" x 2" x 3/16" x 3/16" | 3.84 |
| ST50E | 50*50*6.4*6.4 | 2.12 | 2" x 2" x 1/4" x 1/4" | 4.67 |
| ST54A | 54*54*3.2*3.2 | 1.24 | 9/4" x 9/4" x 1/8" x 1/8" | 2.73 |
| ST54B | 54*54*4.8*4.8 | 1.78 | 9/4" x 9/4" x 3/16" x 3/16" | 3.92 |
| ST60A | 60*60*5*5 | 2.1 | 19/8" x 19/8" x 3/16" x 3/16"
| 4.63 |
| ST64A | 64*64*3.2*3.2 | 1.48 | 5/2" x 5/2" x 1/8" x 1/8" | 3.26 |
| ST64B | 64*64*4.4*4.4 | 1.97 | 5/2" x 5/2" x 3/16" x 3/16"
| 4.34 |
| ST64C | 64*64*6.4*6.4 | 2.8 | 5/2" x 5/2" x 1/4" x 1/4"
| 6.17 |
| ST76A | 76*76*3.2*3.2 | 1.77 | 3" x 3" x 1/8" x 1/8"
| 3.9 |
| ST76B | 76*76*5*5 | 2.7 | 3" x 3" x 3/16" x 3/16" | 5.95 |
| ST76C | 76*76*6.4*6.4 | 3.39 | 3" x 3" x 1/4" x 1/4" | 7.47 |
| ST76D | 76*76*9.5*9.5 | 4.89 | 3" x 3" x 3/8" x 3/8" | 10.8 |
| ST89A | 89*89*6.4*6.4 | 3.95 | 7/2" x 7/2" x 1/4" x 1/4" | 8.71 |
| ST101A | 101*101*3.2*3.2 | 2.38 | 4" x 4" x 1/8" x 1/8"
| 5.25 |
| ST101B | 101*101*5*5 | 3.61 | 4" x 4" x 3/16" x 3/16"
| 7.96 |
| ST101C | 101*101*6.4*6.4 | 4.61 | 4" x 4" x 1/4" x 1/4" | 10.2 |
| ST152A | 152*152*6.4*6.4 | 7.1 | 6" x 6" x 1/4" x 1/4" | 15.7 |
| ST152B | 152*152*9.5*9.5 | 10.4 | 6" x 6" x 3/8" x 3/8" | 22.9 |
| ST152C | 152*152*12.7*12.7 | 13.5 | 6" x 6" x 1/2" x 1/2" | 29.8 |
| STR25 | 25*25*3.175*3.175 | 0.7 | 1" x 1" x 1/8" x 1/8" | 1.54 |
Applications
Construction
Bridges and highways
Chemical
Food and beverage
Manufacturing
Metals and mining
Microelectronics
Oil and gas
Pharmaceuticals
Power generation
Pulp and paper
Leisure
Telecommunications
Transportation
Water and wastewater treatment
Features:
Corrosion resistance
Low maintenance cost
Flame retardant
Low installation cost
Heavy-metal safe
Long service life
Electrical and thermal insulation
High strength-to-weight ratio
Raw material introduction — resin types
Code | Resin type | Flame retardancy | Recommended applications |
|---|---|---|---|
VEFR-25 | Vinyl type | Oxygen index 28 and above | Acid, alkali and other harsh corrosive environments |
IFR-25 | Isophthalic type | Oxygen index 28 and above | VEFR type: economical grade with excellent performance, moderate acid, alkali and solvent resistance |
OFR-25 | Orthophthalic type | Oxygen index 28 and above | General acid and alkali environments |
Applications:
Greenlogy TEC pultruded FRP profiles from Greenlogy TEC are widely used in various applications, combining corrosion resistance, high strength, dimensional stability and light weight with thermal and electrical insulation. Durable Greenlogy TEC profiles provide years of low-maintenance service in applications where steel, aluminum or timber components are traditionally used. Today these profiles are often used in highly corrosive applications that previously required stainless steel and other costly components.
Greenlogy TEC profiles
Physical properties | ASTM | Unit | Value |
|---|---|---|---|
Barcol hardness | D-495 | --- | 45 |
24-hour water absorption | D-570 | % max | 0.45 |
Density | D-792 | lbs./in.³ | 0.062-0.07 |
Coefficient of thermal expansion, LW | D-696 | 10^-6in./in./℃ | 8 |
Flammability | ASTM | Unit | Value |
|---|---|---|---|
Tunnel test* | E-84 | Flame spread | Max 25 |
Flammability* | D-635 | --- | Non-combustible |
Electrical properties | ASTM | Unit | Value |
|---|---|---|---|
Arc resistance, LW | D-495 | 秒（s） | 120 |
Dielectric strength, LW | D-149 | kv./in. | 35 |
Dielectric strength, PF | D-149 | V/mil | 200 |
Dielectric constant, PF | D-150 | @60hz | 5 |
LW = lengthwise, CW = crosswise, PF = perpendicular to laminate surface
*Applies to ISOFR and VEFR only
Application Scenarios
Isophthalic square tubes are suitable for load-bearing and structural applications with moderate corrosion resistance requirements, such as platform supports, handrail frames, grating load-bearing beams, and frame components in the chemical and water treatment industries. Their glass fiber reinforced structure suits large spans and high strength requirements. You are welcome to contact us with your specific working conditions for tailored recommendations.
Selection Guide
Selection should take into account the type of loading, span, support spacing, and service environment. First determine the side length and wall thickness of the square tube, then confirm whether the resin system matches the on-site medium conditions. The isophthalic square tubes in the table are available in multiple specifications. For more detailed mechanical parameters and cross-section selection advice, you are welcome to contact us.
Product Advantages
This structural profile uses glass fiber as reinforcement and resin as matrix, formed by pultrusion. It offers good physical properties and corrosion resistance, and is suitable for high-strength, large-span structures. The isophthalic resin system provides a balance between corrosion resistance and structural load bearing. For specific performance, please consult us based on your service environment.
Inquiry Guidance
For detailed specification sheets, material descriptions, and pricing of isophthalic square tubes, you are welcome to contact us. We will provide the corresponding documents and quotations based on your project requirements. Please let us know the required dimensions, quantity, and service environment so that we can respond more quickly.
Service Environment
- Suitable for indoor and outdoor use, because pultruded glass fiber reinforced material with isophthalic resin resists moisture and weathering better than untreated steel.
- Suitable for humid and chemically corrosive atmospheres, including environments with weak acids, alkalis, or salts, because the isophthalic resin matrix protects the glass fiber reinforcement from corrosion.
- Performs well under temperature fluctuations typical of industrial plants, chemical processing areas, and coastal facilities, maintaining structural integrity where metal square tubes would rust or degrade.
- Recommended for load-bearing frames, handrails, and support structures in wastewater treatment, marine, and offshore environments, where long-term exposure to moisture and corrosive media is expected.
Custom Cutting
Need panels that fit, or cut to shape? We custom cut FRP grating and profiles to your drawing: panels cut to size or to shape (corner cuts, cutouts), cut edges sealed with resin, and pre-cut and pre-drilled to drawing before shipping. See the custom cutting services.
