McNichols fiberglass grating is a common starting point when engineers and buyers spec FRP flooring for industrial platforms, walkways, and chemical-plant service. The catalog covers molded and pultruded construction in polyester, vinyl ester, and fire-retardant resins, plus matching stair treads. For larger projects, a factory-direct supplier can match the same technical spec while cutting out distribution markup and stocked-panel limits. Here is how to compare your options.
What McNichols Fiberglass Grating Is
McNichols is a U.S. metals and composites service center stocking FRP (fiberglass-reinforced plastic) grating as a corrosion-resistant, non-conductive, slip-resistant alternative to steel or aluminum bar grating. It suits wastewater plants, offshore platforms, food processing, plating lines, and anywhere rust, conductivity, or weight is a problem.
The range splits into two construction types. Molded grating is cast as a single piece in an open mold, giving a bidirectional grid with square or rectangular openings and an integral anti-slip surface. Pultruded grating is assembled from pultruded bearing bars (I-bar or T-bar) locked together with cross rods, so it behaves more like steel grating: higher fiber content, greater stiffness, and longer clear spans for a given depth.
The McNichols Lineup at a Glance
| Construction | Styles | Typical grid / depth | Resin options |
|---|---|---|---|
| Molded square grid | MS-S series | 1–2 in depth; 1-1/2×1-1/2 or 2×2 in openings | Polyester, vinyl ester, fire-retardant |
| Molded MINI-GRID | MS-M-150 | 1-1/2 in depth; 3/4×3/4 in top surface | Polyester, vinyl ester, fire-retardant |
| Molded rectangular | MS-R series | 1 in depth; 1×4 in openings (and larger) | Polyester, vinyl ester, fire-retardant |
| Pultruded | I-Bar / T-Bar bearing-bar construction | Bar height and spacing selected to load table | Polyester, vinyl ester, fire-retardant |
The catalog covers mainstream industrial cases well. The friction is usually the supply model, not the product: stocked panel dimensions, per-panel pricing at distribution margins, and limited room for custom layups or colors.
Molded or Pultruded: Picking the Construction Type
Before comparing suppliers, decide which construction the job needs — the wrong choice costs more than any price difference between vendors.
- Choose molded grating when drainage, airflow, or light passage matters, when loads are foot traffic and light carts, and when panels may be cut in the field. Molded panels carry load in both directions, so cutouts for pipes and columns do not destroy the load path.
- Choose pultruded grating when spans exceed roughly 3–4 ft, when concentrated loads (wheeled traffic, equipment skids) govern, or when deflection limits are tight. Continuous glass rovings along the bearing bars give far higher capacity per inch of depth. The trade-off: it is unidirectional, so supports must run perpendicular to the bars.
- MINI-GRID and fine-mesh molded panels suit public walkways where heels, canes, or small wheels must not catch.
How to Evaluate a McNichols Alternative
Whether you stay with McNichols or go factory-direct, run the same five checks:
- Load and deflection tables. Ask for uniform and concentrated load data at your actual support span, and check deflection against your limit (L/100 to L/200 is a common guideline for pedestrian comfort).
- Resin match. Isophthalic polyester handles general and mild chemical service; vinyl ester handles aggressive acids, caustics, and marine exposure; fire-retardant formulations are needed where a flame-spread rating (for example ASTM E84 Class 1) is specified.
- Panel size and cutting waste. Stocked panels are convenient for one-off repairs. On a large layout, factory-cut panels eliminate field cutting and offcut waste.
- Surface and accessories. Confirm grit top versus concave, plus stair treads with nosing, covered grating, and stainless or FRP hold-down clips.
- Lead time and repeatability. For phased projects, you want the same tooling, resin batch control, and color on reorder six months later.
Distributor Stock vs. Factory-Direct: The Real Trade-Off
McNichols is a service center, and that model is genuinely good at what it does: in-stock panels, small quantities, and fast shipment from regional warehouses. A factory-direct manufacturer plays a different game. Neither is “better” — the right choice depends on order size and customization:
| Factor | Distributor / service center | Factory-direct manufacturer |
|---|---|---|
| Best for | Small quantities, urgent replacements, standard panels | Volume orders, repeat projects, custom specs |
| Panel dimensions | Stocked standard sizes; you cut to fit | Cut-to-size or molded to your layout |
| Cost structure | Per-panel price includes warehousing and distribution margin | Material + production cost; lower unit cost at volume, subject to MOQ |
| Customization | Limited to catalog options | Resin system, color, grit, panel size, and grid pattern can be specified |
| Engineering support | Load tables from the catalog | Span and deflection can be engineered to your load case |
Think in total-cost terms rather than panel price. Factory-direct orders carry a minimum order quantity and sea-freight lead time, but unit savings on a container of grating usually outweigh freight beyond a repair-order quantity. Replacing two panels this week? The local distributor wins. Decking a whole platform level? Factory-direct usually wins.
What a Factory-Direct Supplier Can Do
IncomePultrusion is an FRP pultrusion manufacturer in Nanjing, China, producing pultruded FRP profiles, FRP rebar, FRP fasteners, pultrusion machinery, and dies, with custom die and OEM support. For grating buyers, factory-direct supply means:
- Molded and pultruded grating in polyester, vinyl ester, or fire-retardant resin systems, matched to your chemical exposure
- Panels and stair treads cut to your exact dimensions, reducing field cutting and waste on large layouts
- Volume pricing on full panels, cut pieces, and repeat orders, quoted against your drawings
- Custom colors, grit surfaces, and grid patterns on OEM orders
- Consistent tooling for phased projects that reorder over months or years
The bearing bars in pultruded grating are pultruded profiles, so the same production discipline behind our pultruded FRP profiles applies to grating stock. See our pultruded FRP grating for standard options, or send a layout for a custom quote.
FAQ
What is McNichols fiberglass grating made of?
It is fiberglass-reinforced plastic grating in molded or pultruded construction, offered in polyester, vinyl ester, and fire-retardant resin systems. The glass reinforcement carries the load; the resin provides corrosion resistance for chemical plants, marine structures, and outdoor service.
What is the difference between molded and pultruded FRP grating?
Molded grating is cast as one piece with square or rectangular openings, has strength in both directions, and excels at drainage and slip resistance. Pultruded grating is built from I-bar or T-bar bearing bars, so it spans farther and carries more load for the same depth, but only along the bar direction.
Can I get FRP grating in custom sizes instead of stocked panels?
Yes. Factory-direct suppliers cut panels and stair treads to your exact dimensions before shipment, reducing field cutting, edge sealing, and offcut waste on large or repetitive layouts.
Which resin should I choose for FRP grating?
Polyester suits general and mild chemical service, vinyl ester suits aggressive chemicals and marine exposure, and fire-retardant resin is used where a flame-spread rating is specified. Match the resin to your site’s actual chemical list and temperature range rather than choosing on price.
Is factory-direct FRP grating cheaper than buying from McNichols?
For large or repeat orders, factory-direct supply typically gives a lower unit cost because it removes distribution and warehousing margins, though with a minimum order quantity and longer freight lead time. Distributors like McNichols remain the practical choice for small-quantity, fast-ship needs.
Specifying FRP grating for a platform, walkway, or trench cover? Send us your span, load case, panel layout, and chemical exposure, and we will recommend molded or pultruded grating with the right resin system — quoted factory-direct. Contact us for a quote.
