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Fiberglass rebar, also known as FRP rebar, is not only distinguished by its material properties, but also by its color. From bright green to red and yellow, each color used in fiberglass reinforcement rods often serves a specific identification or practical purpose. But does color impact performance? And how should contractors interpret the color of FRP rebar?
The color of FRP rebar typically comes from pigments added to the resin during the manufacturing process. These pigments:
Help visually differentiate products by size, resin type, or usage
Assist in site inspection and compliance
Offer UV resistance or weather visibility in some projects
Colors do not indicate mechanical strength unless specified by manufacturer standards.
| Color | Typical Use Case | Region or Standard Practice |
|---|---|---|
| Green | Most common; general-purpose rebar | Widely used in North America and Asia |
| Yellow | Often used for marine or electrical zones | Used in high-visibility areas |
| Red/Pink | Sometimes denotes vinyl ester resin or specific resin types | May appear in chemical plants or specialty zones |
| White | Non-magnetic or RF-sensitive environments | Hospitals, laboratories, military bases |
| Black | UV-resistant or outdoor-exposed structures | Industrial zones, tunnels, bridges |
Color selection can be project-specific and may follow owner or engineer preferences. Some infrastructure authorities assign color codes to rebar types in large public projects.
Color alone does not change the mechanical performance of fiberglass rebar.
However:
Some resins like epoxy or vinyl ester may be color-coded (e.g., red or pink for vinyl ester).
UV resistance may be slightly improved in darker pigments.
In some cases, surface coating for bonding is also colored, which can affect concrete adhesion performance if improperly applied.
But the tensile strength, modulus, and corrosion resistance remain determined by fiber type, fiber volume content, and resin formulation, not pigment.
Yes, many FRP manufacturers, including GTOFRP™, offer custom color matching based on project needs, including:
Company branding or zoning schemes
Special visibility requirements on site
Project-specific identification (e.g., sewer line vs water line)
Among all available options, green remains the most widely accepted and stocked color for standard projects.
