Surface grinding is done on jobs with to build flat surfaces and the job moves to and fro, the point of contact or the contact arc is bigger, and hence requires wheels with different bonds and combinations of grits and higher porosity further depending on the metallurgy of materials .  Moulds and Dies, Sharpening knifes, blades are few of the types of surface grinding applications.

Applications	dies and moulds, Flat Surface jobs, Typical workpiece materials include cast iron and mild steel. These two materials don't tend to clog the grinding wheel while being processed. Other materials are aluminum, stainless steel, brass and some plastics.
Shape	Type 1 Straight , Type 5 recess on one side, Type 7 recess on both Side.
Size	Diameter : 8 inch to  20 inches​ ​Thickness : 6 mm to 150 mm
Grit combo	46, 4654 ,54,5460,6080,1800
Abrasive	White Alumina, Pink Alumina, Silicon Carbide, Ceramic Alumina.