A grating is any regularly spaced collection of essentially identical, parallel, elongated elements. Gratings can consist of a single set or two sets of elongated elements, in which case the second set is usually perpendicular to the first.
Gratings can come in different size panels and are so versatile that they are used as floors, platforms, ditch cover, air vent, etc. in various industries such as refineries, chemical plants, sewage systems and so on.
Being exposed to humid conditions, water, oil and different range of chemical substances, steel grating cannot be a wise choice due to their low resistance to corrosion and rust, heavy weight and high maintenance. Composite gratings are the best substitute.
There are two types of composite gratings:
1-molded grating:
   molded grating, also known as mesh or grid, are fabricated manually using a mold which resembles a large waffle iron. Continuous reinforcements are placed in the mold in alternating layers and thoroughly wetted out with resin which offers a bi-directional strength as well as high corrosion resistance.
2-pultruded gratings:
   pultruded gratings are produced through an automated pultrusion process.
The surface of gratings can be concave (anti-skid), smooth or gritted (extra anti-skid) according to the customers’ desire. 

The resin used in producing gratings could be ISO or VYNIL (each of which has different characteristics).

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