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Square Tubes

FRP square tubes are hollow square-section profiles pultruded for use as columns, posts, and conduit. They provide structural support with torsional rigidity thanks to the closed shape, yet remain very light and non-corroding. According to Sino Composite, these round/square tubes feature “high strength, light weight, and excellent corrosion resistance”.

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Key Features

  • High torsional stiffness and compressive strength (hollow box shape)
  • Corrosion and UV resistant (pultruded fiberglass + resin)
  • Low thermal conductivity and non-magnetic (electrical insulation)

Benefits

  • Replaces steel or aluminum tube columns in corrosive or exterior settings
  • Uniform wall thickness (consistent performance around the perimeter)
  • Can be easily drilled or cut for custom fittings without crack propagation

Applications

  • Sign posts, guard posts and sensor mounts in outdoor environments
  • Support columns for platforms, shades, and piping frameworks
  • Busbar or cable conduits (non-conductive housing)

Technical Specifications

  • Sizes from small (e.g. 25×25 mm) to large (up to 300×300 mm) per customer needs
  • Wall thickness up to 8–10 mm if high strength needed
  • Lengths up to 6m standard (longer on request)

Unique Selling Points (USPs)

  • Complete rot- and moisture-proof (no swelling or splitting)
  • No welding corrosion or electrochemical issues (unlike metal)