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Fiberglass Grating: An In-Depth Overview

Fiberglass grating is renowned for its robustness and versatility, and is widely used in various industrial and commercial settings. Fiberglass grating performs exceptionally well in harsh chemical environments or moisture-prone maritime settings.
This article introduces the composition, manufacturing processes, and applications of fiberglass grating, clearly showing that it possesses superior qualities compared to traditional materials like steel.
Continue reading to learn more.

What is Fiberglass Grating?

Fiberglass grating, also known as Fiberglass Reinforced Plastic (FRP) grating, is a composite material made from polymer resin and reinforced with glass fiber. This material is valued for its durability, strength, and corrosion resistance, making it widely applied in various industrial and commercial fields.

What are the Alternative Terms for Fiberglass Grating?

Fiberglass grating is alternatively termed as Fiberglass Reinforced Plastic (FRP) grating, composite grating, or simply fiberglass grating. These names derive from the primary material used in its construction—glass fiber.

How is Fiberglass Grating Manufactured?

Molded Fiberglass Grating Production Process

  1. Prepare the Mold: Initially, a mold is prepared to define the shape, size, and pattern of the grating.
  2. Lay-up of Materials: Manually, liquid resin and continuous glass fiber rovings are methodically laid into the mold to achieve the desired thickness and panel dimensions.
  3. Cure: After material lay-up, the mold is set aside for a predetermined time, allowing the panel to cure and harden into the required shape.
  4. Demold and Clean: Once cured, the solidified grating panel is removed from the mold, and the mold is cleaned, ready for the next batch of production.
    This method produces an integral woven mesh structure with square or rectangular mesh patterns, offering excellent corrosion resistance and bi-directional strength. Molded fiberglass grating has a higher resin content (about 65%), thus providing superior corrosion resistance and impact resistance.

Pultruded Fiberglass Grating Production Process and Its Advantages

  1. Pultrusion of Fibers: In the pultrusion process, continuous strands of glass are pulled through a resin bath, where they are thoroughly impregnated with resin.
  2. Forming and Curing: The saturated fibers are then pulled through a heated mold, shaping them into the desired profile and initiating the curing process.
  3. Assembly: Pultruded rods produced by this method are assembled using cross-rods and epoxy resin, mechanically connecting the load-bearing bars.
    Pultruded fiberglass grating, with its high glass content, provides unidirectional strength, making it suitable for applications requiring larger spans or heavier loads.

What Sizes and Resins are Available for Fiberglass Grating?

Common Panel Sizes

  • 4’x8′
  • 4’x12′
  • 3’x10′
  • 5’x10′

Common Thicknesses

  • 1″
  • 1.5″
  • 2″

Available Resins

  1. Vinyl Ester Resin: Known for its excellent corrosion resistance, particularly in highly acidic environments. Its flame spread rating according to ASTM E84 is 100 or less, making it recommended for applications requiring high fire resistance.
  2. Isophthalic Polyester Resin (Corvex): Suitable for industrial, chemical processing, and water/wastewater treatment environments due to its good chemical resistance and durability.
  3. Food Grade Isophthalic Polyester Resin (FGI-AM): This resin system features antimicrobial properties, making it suitable for food processing areas where hygiene is a priority. Available in light gray and green colors.
  4. Orthophthalic, Isophthalic, and Vinyl Ester: These materials are chosen based on the chemical resistance required for the application. Orthophthalic is generally used for less demanding applications, while Isophthalic performs better in chemically resistant environments. Vinyl Ester is used where high chemical resistance is needed.
  5. Polyester Resin: Commonly used due to its cost-effectiveness and ease of use. Suitable for large-scale projects requiring multiple layers of fiberglass, such as shipbuilding or large decks.
  6. Epoxy Resin: Preferred for high-performance applications due to its excellent adhesive properties and resistance to environmental degradation.

What are the Advantages and Disadvantages of Fiberglass Gratings?


  • Corrosion Resistance: Highly resistant to corrosion, making it suitable for chemical plants, offshore drilling platforms, and regions with harsh climatic conditions.
  • Strength and Durability: Although lightweight, fiberglass grating has strength comparable to steel and is known for its durability, often outlasting steel, especially in corrosive environments.
  • Low Maintenance Costs: Fiberglass grating requires little maintenance, can be easily cleaned with water and soap, and does not require frequent painting, reducing long-term maintenance costs.
  • Non-Conductive: Being non-conductive, it is safer to use in environments with electrical hazards, such as power plants.
  • Lightweight: Much lighter than traditional materials like steel, reducing transportation costs and easing installation.
  • Safety Features: Can be equipped with anti-slip surfaces to minimize fall hazards in workplaces,designed to prevent slipping or sliding.
  • Flame Retardant: Some types of fiberglass grating have a flame spread rating of 25 or lower according to ASTM E-84 tests.
  • High Impact Resistance: More flexible than steel, fiberglass grating can withstand impacts without damage due to its adjustable hardness coatings.
  • Heat Resistance: Offers excellent heat resistance, making it a safer alternative to steel in environments where thermal conductivity can pose risks.
  • Cost-Effectiveness: While initial investment may be higher than steel, the overall lifecycle cost is often lower due to its durability and low maintenance requirements.
  • Ease of Installation: Can be installed with conventional tools, no need for welding, further reducing installation costs.
  • Aesthetic Variety: Available in various colors, suitable for color-coding walkways and structures as part of large facility safety systems.
  • Non-Magnetic: Its non-magnetic nature makes it suitable for environments sensitive to magnetism.
  • Age Resistance: Some types of fiberglass grating have a lifespan of over 50 years, exhibiting excellent resistance to aging.


  • Strength Limitations: Fiberglass grating is not as strong as steel grating, which may not be suitable for some industrial applications requiring high load-bearing capacity.
  • Cost: Generally, fiberglass grating is more expensive than steel grating and plastic grating, not always the most cost-effective choice for every project.
  • Cutting and Installation Challenges: Cutting and installing fiberglass grating can be challenging, requiring appropriate tools and experience to ensure correct and safe installation.
  • Recycling: Unlike some other materials, fiberglass grating does not have significant recycling value, which may be a disadvantage in terms of environmental sustainability.
  • Thermal Conductivity: Although it has low thermal conductivity, this can be seen as a disadvantage in applications where heat dissipation is needed.
  • Aesthetic Deterioration Over Time: While durable, the appearance of fiberglass grating can become slightly dull after several years of use, which may affect the aesthetics of the installation.
  • Damage Potential: Although generally durable, fiberglass grating can still be damaged by heavy impacts or abrasive forces, so any such damage should be repaired promptly to prevent further deterioration.

How Do Various Factors Affect Fiberglass Grating Performance?

Factors influencing the performance of fiberglass grating include:

  • Load Requirements: The grating must be able to withstand the maximum loads it may encounter in its specific applications.
  • UV Degradation: Over time, exposure to UV radiation can affect the performance of plastic channels, which may be part of some fiberglass grating systems.
  • Fiber Content: The amount of fibers in the composite material affects the grating’s strength and durability.
  • Dimensional Impact: The dimensions and shape of the grating affect its performance, especially its load-bearing capacity and resistance to bending and twisting.
  • Curing Speed: The curing process affects the final performance of the fiberglass grating, such as strength and chemical resistance.
  • Manufacturing Process: Methods like pultrusion determine the uniformity and performance characteristics of the grating.
  • Sizing Stability: The stability of fiber sizing formulations is crucial for maintaining the quality and consistency of the grating during production.
  • Environmental Conditions: Exposure to corrosive elements, moisture, heat, and chemicals can affect the grating’s lifespan and effectiveness.
  • Creep Characteristics: Factors like the modulus of elasticity, tensile strength, corrosion resistance, and anti-aging performance influence the creep behavior of fiberglass grating.
  • Material Selection: The choice of resins and other materials used with the fiberglass, such as polymer concrete or pultruded composites, affects the grating’s corrosion resistance and overall performance.
  • Applicability of Non-Destructive Testing (NDT): The ability to effectively use non-destructive testing technologies, such as Fiber Bragg Grating (FBG), is crucial for long-term monitoring of the grating’s condition and performance.

What Are the Applications of Fiberglass Grating?

Fiberglass grating is extensively used across various industries due to its corrosion resistance, high strength, and non-conductive properties. Here are some of the primary applications:

  • Industrial Flooring: Widely used as industrial flooring due to its durability and tolerance for harsh chemicals and environments. It is particularly suitable for chemical plants where corrosive substances are frequently handled.
  • Offshore Platforms and Vessels: Ideal for offshore platforms and vessels due to its saltwater corrosion resistance and non-conductive nature, allowing for safe use in electrically hazardous environments.
  • Walkways and Bridges: Employed in the construction of walkways and bridges, especially in moist and corrosive environments like water treatment plants and marine applications. Its anti-slip surface enhances safety in these high-traffic areas.
  • Water and Wastewater Treatment Facilities: Used in water and wastewater treatment plants for walkways, platforms, and trench covers to prevent water accumulation.
  • Architectural Applications: Used in fences, facades, and other architectural features. Its lightweight nature allows for more flexible design options.
  • Transport Infrastructure: Utilized in constructing transport infrastructure, such as train station platforms, airport walkways, and stair treads, providing a durable, maintenance-free surface.
  • Power Plants: Employed in power plants, including nuclear and renewable energy facilities, where its non-conductive properties enable safe access to critical areas.
  • Commercial Pools and Water Parks: Suitable for commercial pools, water parks, and other recreational facilities due to its slip resistance and ability to withstand continuous contact with water and chemicals.
  • Food and Beverage Industry: In the food and beverage industry, fiberglass grating is used in areas requiring high standards of cleanliness and moisture resistance due to its hygienic properties.
  • Chemical Processing Plants: Widely used in chemical processing plants for platforms, walkways, and staircases, where chemical resistance and safety are crucial.
  • Oil and Gas Industry: In the oil and gas industry, it is used in refineries and offshore platforms for walkways, platforms, and other structural components due to its corrosion resistance and strength.

Is GRP Grating Better Than Steel Grating?

GRP (Glass Reinforced Plastic) grating offers several key advantages over steel grating, particularly in environments where corrosion, weight, and maintenance are major concerns.

Advantages of GRP Grating Compared to Steel Grating

  1. Corrosion Resistance: GRP grating has superior corrosion resistance compared to steel. It does not rust, degrade, or corrode in the presence of chemicals, saltwater, or harsh environmental conditions, making it the ideal choice for chemical plants, offshore platforms, and other corrosive environments.
  2. Weight and Installation: GRP grating is much lighter than steel, simplifying transportation and installation. Its lightweight nature reduces the need for heavy lifting equipment, making it easier to handle and install, which may lower installation costs.
  3. Maintenance: GRP grating requires minimal maintenance. Unlike steel, it does not need regular painting or special coatings to prevent corrosion, thus reducing long-term maintenance costs.
  4. Safety: GRP grating is often designed with anti-slip surfaces, enhancing safety in wet or slippery conditions. Additionally, its non-conductive nature makes it safer to use in environments with electrical hazards.
  5. Durability: Despite being lightweight, GRP grating is durable and maintains its integrity even in harsh conditions. It also has high impact resistance, meaning it can withstand impacts that might dent or damage steel.
  6. Flexibility and Customization: GRP can be easily cut and adjusted on-site with simple tools for last-minute modifications during installation. Additionally, it is available in various colors, allowing for safety enhancements through color coding or meeting aesthetic requirements.

Limitations of Steel Grating

Steel grating is known for its high strength and load-bearing capacity, making it suitable for heavy-duty applications, but it also has several drawbacks:

  • Corrosion: Steel grating requires galvanizing or other coatings to prevent rust and corrosion, which increases initial costs and maintenance.
  • Weight: Steel is heavier, making transportation and installation more challenging, often requiring more labor and heavier equipment.
  • Maintenance: Steel grating typically requires more maintenance than GRP, including regular inspections and re-coating to prevent corrosion.

Is Fiberglass Grating Cheaper Than Steel?

No, in terms of upfront costs, fiberglass grating is generally not cheaper than steel grating. Although the initial material costs for steel grating are usually lower, when considering the total ownership costs, including installation, maintenance, and potential replacement, fiberglass grating often proves to be more cost-effective in the long run due to its low maintenance requirements and corrosion resistance.


Fiberglass grating offers a range of benefits that make it a preferred choice in many industrial and commercial applications. Its durability, low maintenance, and versatility in harsh environments provide significant advantages over traditional materials like steel. However, it’s essential to consider the specific needs of your project to determine whether fiberglass grating is the most suitable and cost-effective option.

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