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Structural Profiles - Square Tube (Orthophthalic)
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Nantong Greenlogy TEC Electronic Technology Co., Ltd.
FRP profiles are a new type of composite material made with glass fiber reinforcement as the raw material and resin as the binder, with glass fiber cloth as the wrapping reinforcement layer; after thorough impregnation, they are heated, formed and cured in a metal mold and drawn out by a pulling machine. With good physical properties, they are widely used in high-strength and long-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 |
Markets
Construction
Bridges and highways
Chemical
Food and beverage
Manufacturing
Metals and mining
Microelectronics
Oil and gas
Pharmaceutical
Power
Pulp and paper
Recreation
Telecommunications
Transportation
Water and wastewater treatment
Features:
Corrosion resistant
Low maintenance
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 retardant performance | Recommended applications |
|---|---|---|---|
VEFR-25 | Vinylester 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, good performance, resistant to moderate acids, alkalis and solvents |
OFR-25 | Orthophthalic type | Oxygen index 28 and above | General acid and alkali environments |
Applications:
Greenlogy TEC pultruded FRP profiles are widely used in various applications, combining corrosion resistance, high strength, dimensional stability and light weight, with thermal insulation and electrical insulation properties. Durable Greenlogy TEC profiles provide years of low-maintenance service in areas where steel, aluminum or wood components have traditionally been specified. Today, these profiles are often used in highly corrosive applications that would otherwise require 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 |
Combustibility* | 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 | Volts/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
Square tube structural profiles are commonly used for platform and walkway supports, handrail frames, equipment supports and large-span frames where strength and corrosion resistance are required. In corrosive environments such as chemical processing, water treatment and electroplating, they can replace some conventional metal profiles. Contact us to discuss suitable applications based on your specific working conditions.
Selection Guide
When selecting, first confirm the cross-section dimensions (A×B) and wall thickness (T1, T2), then evaluate comprehensively in relation to span, load type and support method. Different resin systems and fiber content affect mechanical performance. For specific specifications and load-bearing recommendations, contact us for detailed specifications and a quotation.
Product Advantages
The square tube is pultruded from glass fiber reinforcement combined with resin, offering light weight, high strength, corrosion resistance, insulation and ease of cutting and processing. Surfaces can be treated in different ways as required to suit various installation methods. For details on specific performance and process, contact us.
Inquiry Guide
For specific cross-section dimensions, wall thickness combinations or bulk supply solutions, contact us for detailed specifications and a quotation. Please provide the required dimensions, quantity and operating environment, and we will recommend a suitable product solution accordingly.
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.
