Structural Fiberglass General Properties

Fiberglass products come in all shapes and sizes, for a wide variety of structural applications, and are fabricated either as molded fiberglass or pultruded fiberglass, depending on the need.

ISO 9001 Certified

All FRP products from National Grating are made in an ISO 9001 certified shop, quality assured.

Molded FRP Grating

Molded FRP Grating is made using a mold where the glass is layered. These floor grates are less expensive than pultruded FRP floor grating, but have a much higher resin content giving them more corrosion resistance, although they have less structural load capacity. Molded Fiberglass grating is ideal for corrosive environments with a lot of foot traffic, including wastewater treatment plants, industrial and chemical plants, corrosive environments like marine or urban locations, power plants, etc. Molded Grating Tech Specs

Pultruded FRP Grating

These fiberglass floor grates are creating by pulling glass strands through a machine, which are then sealed together into the desired shape. Pultruded Fiberglass Grating comes in a wide variety of shapes, thicknesses, and cross-bar assemblies, depending on the load requirements of the application. Pultruded Grating Tech Specs

Pultruded FRP Structural Products

The pultruded structural FRP products include beams, angle, c-channel, equal leg angle, railing, tube, and any other pultruded shape. Pultruded Structural Product Tech Specs

Pultrusion is a process which continuously feeds fiber reinforcement in polyester or other thermosetting reins through a heated die to form a final shape. Fiberglass rovings and mats are drawn through a resin bath in which all the materials are properly mixed with a thermosetting resin. There are two main raw materials involved in the manufacture of pultruded fiberglass products: resin and glass.

Resin Selection

Selecting a resin for your structural fiberglass products is an important step. Standard resins are Vinyl Ester, which superior corrosion resistance. Other options include Isophthalic Polyester, which provides industrial grade corrosion resistance and extra fire retardant, Ortho, and Phenolic resins. The resin selection chart outlines the different options available. Resin Selection Chart

Glass Fiber Used in Pultrusion

Rovings :

The longitudinal strength of pultruded profiles is provided by long glass rovings, or strands. The quantity and location is decided at the initial stage. The strategic use of glass rovings is critical in improving tensile properties of pultruded fiberglass structures.

Mat :

Mats are used in combination with rovings to improve transverse properties. The mat covers the roving, creating a stronger, longer-lasting structure. A variety of different mats are stitched to improve the properties as required.

Veil :

The surfacing veil helps to improve surface finish of fiberglass pultruded profiles. It holds more resin, giving the final FRP product a good finish and helping against corrosion.