FRP Glossary

Additive: A constituent component that may be added to the composite matrix to modify its properties and in general, enhance its performance. Additives include catalysts, colorants, flame retardants and other ingredients that expand and improve the capabilities of the matrix.

Aspect Ratio: Ratio of length to diameter. For a composite, it refers to the specific ratio of the fiber or filler in the composite matrix.

Banding: Flat bar epoxied and/or mechanically attached flat against the outer edge of a section of grating or stair tread to provide a closed bar surface.

Composite: A combination of one or more materials differing in form or composition on a macroscale. The constituents retain their identities; i.e. they do not dissolve or merge completely into one another, although they act in concert. Normally, the components can be physically identified and exhibit an interface between one another.

Filler: An inorganic addition to the composite matrix that may impart a variety of performance improvements such as shrinkage control, surface smoothness, water resistance and cost reduction or is added to lower cost or density.

Hold Down Clips: A device used to fasten panels of grating to their supports, usually in the form of a metal clip or fastener, found on our accessories page.

Mesh: General reference of a grid pattern of a molded grating panel.

Meniscus SurfaceA concave surface inherit in open molded grating produced as the resin forms a meniscus interface at the mold block during cure, resulting in two (2) sharp edges on the grating bars. This provides a slip-resistant surface.

Molded Grating: Fiberglass grating formed in an open mold process resulting in a one piece homogeneous product. The high resin to glass ratio and one piece construction provides superior corrosion resistance, impact resistance, and structural properties than other manufacturing processes. Square mesh molded grating has bidirectional strength offering the best utilization and minimizing the need for additional supports.

Molding: The forming of a resin/fiber material shaped into a solid mass of prescribed shape and size.

Phenolic Resins: Phenolic composites have many desirable performance qualities including high temperature resistance, creep resistance, excellent thermal insulation and sound damping properties, corrosion resistance and excellent fire/smoke/ smoke toxicity properties.

Polyester Resins: Considered the “workhorse” of the composites industry, these resins offer a balance of properties (including mechanical, chemical, electrical) dimensional stability, cost and ease of handling or processing. Polyesters are versatile because of their ability to be modified or tailored. Ortho-and Iso-Polysters are two types of polyester resins formulated to enhance corrosion resistance.

Pultruded Grating: Fiberglass grating manufactured by assembling pultruded shapes into grating panels. The 65% glass to resin ratio of pultruded grating makes it stiffer than molded grating, allowing it to span greater distances. This same high glass ratio and the integrity of the shape being compromised by the assembly process make pultruded grating products less corrosion resistant and impact resistant than molded gratings, but still superior to metal gratings.

Reinforcement: Strong materials bonded to or into a matrix to improve mechanical properties. Materials, ranging from short fibers through complex textile forms, that is combined with a resin to provide the composite with enhanced mechanical properties.

ResinA natural or synthetic viscous liquid, solid or semisolid, organic material of indefinite and often high molecular weight having a tendency to flow under stress, usually has a softening or melting range, and usually fractures conchoidally. Polymeric material that is rigid or semi-rigid at room temperature, usually with a melting-point or glass transition temperature above room temperature.

Safety Factor: The ratio of the limit state of a structural element to the actual anticipated load state.

Span: (1) The center-to-center distance between the grating supports; see also LENGTH; (2) The direction in which load is carried.

Thermoplastic: Resin that is not cross linked. Thermoplastic resin generally can be remelted and recycled.

Thermoset: Resin that is formed by cross linking polymer chains. A thermoset cannot be melted and recycled because the polymer chains form a three dimensional network.

Vinyl Ester (Vinylester) Resins: Vinyl esters offer mechanical toughness and excellent corrosion resistance.

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