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STI 4438 Prep/Master Propane Grinder

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  • STI-4438LP Propane Grinder

 Product Description

Ideal for Polishing Projects up to 2,000 SF (200 M2)

The STI-2807 floor grinding machine is designed for small to medium-sized commercial projects and residential garage finishing. This machine is the smallest of the P/M machine line, but still produces perfect results in grinding or polishing. Its 7.5HP 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. Available in 230V or 480V. Uses two tool plates (included). Recommended for project sizes up to 2,000 SF (200m2).

Working width: 28 in. (71cm)
7.5 HP (5.5kW)
1 or 3 phase
Available in 230V or 480V
2 tool plates (included)
Uses 6 tools


  • Machine Specs - Propane
  • Coverage: 20,000 SF (1,858 m2)
  • Motor Kawasaki: 38HP LP
  • Motor RPM: 2,200 - 3,650 RPM
  • Dimensions: 78L x 44W x 50H in. (198 x 112 x 127 cm)
  • Working Width: 44 in. (112 cm)
  • Weight: 1,315lbs (596kg)
  • Tools Needed: 24
  • Tools RPM: 366-500 RPM
  • Tools Attachment Style: EG Attachment System
  • Vacuum Hose Connection:3 in. (76 mm)
  • Recommended Vacuum: PM3003GP

Production Rates

  • Mastic Removal: 725 SF (70 m2) per hour
  • Thin Set Removal: 725 SF (70 m2) per hour
  • +/-25 Mil Coatings: 575 SF (60 m2) per hour
  • Concrete Polishing: 5,025 SF (500 m2) per hour

 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

Kawasaki 38HP LP
Motor RPM:
2,200 - 3,650 RPM
Vacuum Hoses (sold separately):
3 in/ 76 mm x 25 ft/ 8m x Two
1,062 lbs | 482 kg
Tool RPM:
366 RPM to 500 RPM
Pressure on Tools:
1,005 lbs/ 456 kg with weights
Tools Available:
84" L x 44" W x 50" H / 213 cm x 111 cm x 127 cm
Cleaning Path:
44"/ 111 cm x 77"/ 195 cm sweep
Product Data Sheet:

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