The DC-21-1170 pairs Mercury's largest 21" apron with a 1170 RPM burnishing speed — lower than the DC-21-2000, which makes it the better choice for facilities that burnish daily or multiple times per week. At 1170 RPM, the machine generates less friction heat per pass, which means less thermal stress on the floor finish coat over time. The same 1.5 HP D/C rectified motor and front caster pad-pressure system used in the 2000 RPM model carry over here, so the build quality and chassis weight (86 lbs.) are consistent across the DC-21 line.
DC-21-1170 Motor, Speed, and Chassis
Motor: 1.5 HP D/C rectified, 15 Amp — eliminates burnouts and handles voltage variation in large facilities
Speed: 1170 RPM — lower heat burnishing; gentler on finish coats, suited for frequent burnishing programs
Apron size: 21" polished aluminum with full-wrap non-marking bumpers
Pad pressure: front caster assembly with flexible pad holder and threaded centering device
The DC-21-1170 suits large-area floors where burnishing is part of a daily maintenance program rather than a periodic restoration event. Hotel lobbies, convention center floors, grocery store main aisles, and healthcare facility corridors that require daily shine maintenance are the typical applications. At 1170 RPM, the machine is quiet enough to use during light occupancy without significant noise complaints, and the reduced heat cycle means the finish coat can sustain daily burnishing without premature deterioration.
Pro Application Details for the DC-21-1170
The choice between 1170 RPM and 2000 RPM in the DC-21 line comes down to burnishing frequency and finish coat durability goals. Daily burnishing at 2000 RPM generates enough heat to gradually break down the finish polymer structure, requiring re-coating more often. At 1170 RPM, the gloss result is slightly less intense — a satin rather than wet-look — but the finish coat lasts longer before needing stripping and re-coating. Use white or tan pads at 1170 RPM; natural fiber pads also work well. The 21" apron and 86-lb. machine weight give the DC-21-1170 a slight weight advantage over the 84-lb. DC-19-1170 for pad seating on smooth VCT.
The DC-21-1170 pairs Mercury's largest 21" apron with a 1170 RPM burnishing speed — lower than the DC-21-2000, which makes it the better choice for facilities that burnish daily or multiple times per week. At 1170 RPM, the machine generates less friction heat per pass, which means less thermal stress on the floor finish coat over time. The same 1.5 HP D/C rectified motor and front caster pad-pressure system used in the 2000 RPM model carry over here, so the build quality and chassis weight (86 lbs.) are consistent across the DC-21 line.
DC-21-1170 Motor, Speed, and Chassis
Motor: 1.5 HP D/C rectified, 15 Amp — eliminates burnouts and handles voltage variation in large facilities
Speed: 1170 RPM — lower heat burnishing; gentler on finish coats, suited for frequent burnishing programs
Apron size: 21" polished aluminum with full-wrap non-marking bumpers
Pad pressure: front caster assembly with flexible pad holder and threaded centering device
The DC-21-1170 suits large-area floors where burnishing is part of a daily maintenance program rather than a periodic restoration event. Hotel lobbies, convention center floors, grocery store main aisles, and healthcare facility corridors that require daily shine maintenance are the typical applications. At 1170 RPM, the machine is quiet enough to use during light occupancy without significant noise complaints, and the reduced heat cycle means the finish coat can sustain daily burnishing without premature deterioration.
Pro Application Details for the DC-21-1170
The choice between 1170 RPM and 2000 RPM in the DC-21 line comes down to burnishing frequency and finish coat durability goals. Daily burnishing at 2000 RPM generates enough heat to gradually break down the finish polymer structure, requiring re-coating more often. At 1170 RPM, the gloss result is slightly less intense — a satin rather than wet-look — but the finish coat lasts longer before needing stripping and re-coating. Use white or tan pads at 1170 RPM; natural fiber pads also work well. The 21" apron and 86-lb. machine weight give the DC-21-1170 a slight weight advantage over the 84-lb. DC-19-1170 for pad seating on smooth VCT.
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