Molded Fiberglass Grating | FRP Grating
Molded fiberglass grating is manufactured in a one piece construction process by interlacing pre-wetted glass reinforcing strands in a liquid resin matrix within a given configuration. Once the resin matrix has cured, the molded grid is removed from the mold. The one piece construction insures that all glass is impregnated with resin. Molded fiberglass grating is chemical resistant and non-sparking. It is commonly used in marine platforms and food processing applications.
Strength: Interwoven square mesh construction offers bi-directional strength. This construction allows for increased loading versatility when compared to rectangular mesh. The uniform placement of the continuous glass strands during construction provides superior strength.
Corrosion Resistance: Molded grating should be the product of choice for severe corrosive environments.
Fabrication Features: In areas that require circular cuts or areas to be field cut and fabricated, molded square mesh offers great versatility and will often eliminate the need for additional support for cut edges. Another feature is its easy adaptability to evaluated floor systems through use of special leg pedestals. The pedestal flooring system helps compensate for an uneven sub floor or slope.
Safety Surface: Molded Grating offers an outstanding skid resistant concave surface as an option. A molded-in grit surface is also available to provide sure footing for worker safety, yet its non-porous qualities help eliminate bacterial breeding areas in food applications.
Download entire Molded and Pultruded Fiberglass Grating Catalog in PDF format
Molded Grating Fasteners
Marco Specialty Steel supplies various types of clips for its gratings. Pawl Clips and G Clips (part A ), are for molded grating only. CSSM clips (part A ), J clips and T clips are for pultruded grating only. W clips are only for gratings with solid plates, for example, stair tread or covered grating.
 M Clips |
 C Clips |
 L Clips |
 Pawl Clips |
 G Clips ( Part A & B ) |
 CSSM Clips ( Part A & B ) |
 J Clips |
 T Clips |
 W Clips |
| Thickness | Mesh Size | Wt/SF | Panel Size | Open Area | Surface | Resins | Standard Colors |
|---|---|---|---|---|---|---|---|
| 1" | 1-1/2" x 1-1/2" Square Mesh | 2.5 | 3' x 10' 4' x 8' 4' x 12' |
70% | Concave or w/Grit |
Isophthalic Vinyl Ester |
green, yellow, light gray, orange, dark gray |
| 1-1/2" | 1-1/2" Square Mesh | 3.7 | 3' x 10' 4' x 8' 4' x 12' |
70% | Concave or w/Grit |
Isophthalic Vinyl Ester |
green, yellow, light gray, orange, dark gray |
| 2" | 2" Square Mesh | 4.2 | 4' x 12' | 71% | Concave or w/Grit |
Isophthalic Vinyl Ester |
green, yellow, light gray, orange, dark gray |
| Thickness | Mesh Size | Wt/SF | Panel Size | Open Area | Surface | Resins | Standard Colors |
|---|---|---|---|---|---|---|---|
| 1" | 1" x 4" Rect. Mesh | 2.6 | 3' x 10' | 69% | Concave or w/ Grit |
Isophthalic Vinyl Ester |
green, yellow, light gray, orange, dark gray |
| Resin Systems | ||||||
|---|---|---|---|---|---|---|
| Resin Type | Resin Base | Description | Corrosion Resistance | Flame Spread Rating ASTM E84 | Available colors | Max.Oper. Temp. |
| Type V | Vinyl Ester | Superior Corrosion Resistance and Fire Retardant | Excellent | Class 1, 25 or less | Dark Grey, Orange, Yellow | 230 oF |
| Type I | Isophthalic Polyester | Industrial Grade Corrosion Resistance and Fire Retardant | Very Good | Class 1, 25 or less | Green, Yellow, Light Grey | 221 oF |
| Type F | Isophthalic Polyester | Food Grade Corrosion Resistance and Fire Retardant | Very Good | Class 2, 75 or less | Light Grey | 221 oF |
| Type O | Ortho | Moderate Corrosion Resistance and Fire Retardant | Moderate | Class 1, 25 or less | Green, Yellow, Light Grey | 212 oF |
| Type P | Phenolic | Low Smoke and Superior Fire Resistance | Very Good | Class 1, 5 or less | Reddish-Brown | 356 oF |
Fabrication Procedures
 |
 |
Safety Precautions -- When cutting Molded grating, always wear safety goggles to protect your eyes and a dust mask to reduce dust inhalation. Also wear gloves and a shop coat with neck and sleeves taped to prevent skin irritation. Work in a well-lighted and ventilated area.
Cutting Molded Grating -- Depending on the amount (linear feet) of grating to be cut, a variety of shop tools can be used. For best results, use a heavy-duty rotary saw with a masonry, carbide or diamond coated blade. Firm support of the panels will prevent shifting. Turning the panel bottom-side-up gives a smooth surface for the saw to ride on and reduces chipping. Be sure to allow for the blade kerf (3/16") when measuring.
Grinding -- All cut edges should be ground smooth. Use a coarse grit, open coated (resin) grinding disk.
Finishing -- All cut surfaces should be coated with resin to prevent corrosion of glass fibers. A light coating of two-part resin system or urethane spray paint is satisfactory.
Installation -- Provide for a minimum of 1-1/2" support around all panel edges. Use type "M" stainless steel (type 316) clips every 48" (maximum) for full 4' x 12' panels, a minimum of four clips for any piece.
| Pit cover | Petroleum platform | Wastewater treatment |
 |
 |
 |
| Stair tread | Fence | Tank top platform |
 |
 |
 |
| Anti-corrosion pack | Double flooring | Deck |
 |
 |
 |
