FRP Tubes

What Are FRP Tubes?

FRP (Fiberglass Reinforced Plastic) tubes are strong, lightweight pipes made by combining glass fibers with plastic resins. They are suitable for projects that need materials resistant to rust and corrosion, even in harsh conditions.

Our FRP tubes are manufactured using pultrusion and filament winding methods to ensure consistent quality. They are used in chemical processing, electrical systems, water treatment, and structural applications.

Technical Parameters

Parameter
Value Range
Notes

Tensile Strength
14–550 MPa
Varies with resin and fiber content

Flexural Strength
28–480 MPa
Varies with diameter and wall thickness

Compressive Strength
69–275 MPa
Depends on reinforcement architecture

Tensile Modulus
3.5–34.5 GPa
Stiffness under tension

Flexural Modulus
6.9–34.5 GPa
Stiffness under bending

Specific Gravity
1.2–2.3
Lower density than steel

Glass Content
60–85% by weight
Higher glass content increases strength

Water Absorption
Less than 0.3%
Resists swelling and weakening when wet

Heat Distortion Temperature
Up to 186°C
Suitable for elevated-temperature applications

Thermal Insulation
2.69 W/(m²K)
Similar to PVC

Dielectric Strength
10–15 kV/mm
Provides electrical insulation

Bending Strength
200–300 MPa
Typical range after conditioning

Shear Strength
Up to 11,400 N/mm²
Reported maximum value

Poisson’s Ratio
Approximately 0.3
Predictable dimensional changes under load

Thermal Coefficient
14–54 mm/mm/°C
Minimal expansion/contraction with temperature

Size and Dimension Options

Feature
Available Options
Notes

Diameter
8 mm to 1000 mm+
Custom sizes available

Wall Thickness
0.1 inch to 0.5 inch+
Selected based on pressure requirements

Length
Up to 18 meters
Standard lengths: 3 m, 6 m, 12 m, 20 ft

Shapes
Round, Square, Rectangular
Square tube example: 30×30×3 mm weighs 648 g/m

Surface Finish
Smooth, Textured
Customizable roughness parameters

Manufacturing Methods

Pultrusion
Our main production method pulls glass fibers through resin and a heated die to create consistent tubes. This process produces:

Straight tubes with uniform walls
High fiber content (up to 85%)
Consistent physical properties
Cost-effective production for standard sizes

Filament Winding
For tubes that handle internal pressure, fibers are wound at specific angles (usually ±55°) around a rotating form. This method:

Creates seamless tubes
Allows customization of strength in different directions
Produces tubes with consistent roundness
Can handle larger diameters than pultrusion

Contact Molding
For special projects or unique designs, tubes are built using hand lay-up techniques. This approach:

Allows for custom designs
Works well for very large diameters
Can incorporate special features like flanges or fittings
Is suitable for low-volume, specialized applications

Real-World Applications

Chemical Industry

Acid Transfer Lines: Used in chemical plants where corrosion resistance is required.
Chemical Storage Tanks: Used for long-term chemical containment.
Scrubber Systems: Used to reduce replacement cycles in corrosive exhaust systems.

Electrical Applications

Insulation Components: Used by electrical utilities for 10–15 kV/mm dielectric strength.
Cable Conduits: Used to protect fiber optic and communication cables.
Control Panel Supports: Used where non-conductive properties are required.

Water Systems

Municipal Water Lines: Used for clean water distribution.
Wastewater Treatment: Used to handle aggressive chemicals and bacteria.
Irrigation Systems: Used for UV-resistant field installations.

Structural Uses

Building Frameworks: Used for lightweight, corrosion-resistant structures.
Marine Applications: Used where saltwater resistance is required.
Industrial Supports: Used in chemical plants where metal may corrode.

Durability

Unlike metal pipes that rust or corrode, FRP tubes are designed for long-term use in harsh environments. Their corrosion resistance and low maintenance requirements make them a practical choice for many industrial and infrastructure applications.