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STI 3025 Prep/Master Grinder

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  • STI-3030 Prep/Master
  • STI-3030 Prep/Master

 Product Description

The Prep/Master STI-3025 floor grinding machine is an ideal choice for project sizes up to 10,000 SF (1,000 m2). Despite its heavy weight and size, this grinder is extremely easy to operate due to the smooth operation of the STI rotary gear system. Its 25HP motor is built to last and its variable speed drive easily adapts to different grinding or polishing conditions for concrete, terrazzo, marble, and stone applications.

The moveable pocket weight system adjusts head pressure depending upon application and the standard water tank makes it easy to switch from dry to wet work. The 3025 is available in 230V and 480V. Uses four tool plates (included) and twelve tools.


  • Motor: 25 HP - 3 phase | 18.5kW
  • Power Source: 220/230 VAC 1 or 3 Phase 60 Hz
  • 380/480 VAC 3 Phase 50-60Hz
  • Power Cord: 30 ft./9m (6-4)
  • Vacuum Hose Connection: 3 in./76mm x 25 ft./8m
  • Weight: 1,298 lbs. | 589 kg
  • Tool RPM: 300 RPM to 750 RPM variable
  • Number of Tools: 12
  • Tools Attachment Style: EG Proprietary Attachment System
  • Dimensions: 86”L x 30”W x 52”H, 218cm x 76cm x 132cm
  • Recommended Vacuum: Duo Vac (630CFM) with pre-separator or equivalent

Production Rates

  • Mastic Removal: 600 SF /56 m2 per hr
  • Thin Set Removal: 600 SF /56 m2 per hr
  • Mil Coatings Removal: 425 SF / 39 m2 per hr
  • Polished Concrete: 1,200 SF /111.5 m2 per hr


 Warranty Information

Prep/Master® Warranty

Substrate Technology guarantees that its machines and products are without manufacturing defects. The warranty period on machines is one (1) year from the date of sale and the variable speed drive carries a two (2) year warranty from the date of sale. Substrate Technology will replace any part that is defective at its own cost within the warranty period. This warranty does not cover wear items or instances of abuse or neglect.

 Other Details

30 HP - 3 phase | 22 kW
Power Source:
220/ 230 VAC 1 or 3 Phase 60 Hz or 380/480 VAC 3 Phase 50-60 Hz
85 Amp/ 50 Amp Soft Start or 25 Amp Soft Start
Motor RPM:
2625 @ 90 Hz
Power Cord:
25 ft/ 8 m (10-4)
Vacuum Hoses (sold separately):
3 in/ 76 mm x 25 ft/ 8 m x Two
1,064 lbs | 484 kg
Tool RPM:
750 RPM (90 Hz)
Pressure on Tools:
1,010 lbs/ 459 kg with weights
Tools Available:
81" L x 30" W x 50" H / 205 cm x 76 cm x 127 cm
Clearning Path:
30"/ 76 cm x 52"/ 132 cm sweep
Mastic Removal:
550 sq ft/ 51 sq m per hour
Thin Set Removal:
550 sq ft/ 51 sq m per hour
Mil Coatings Removal:
375 sq ft/ 35 sq m per hour
Concrete Polishing:
1,200 sq ft/ 111 sq m per hour
Product Data Sheet:
Product Manual:

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