DR-3 300/400# - Dry Resin

The Concrete Protector's DR-3 300-400 is a premium diamond resin polishing pad designed specifically for dry Scientific Concrete Polishing systems. Used in the intermediate polishing stage, it refines the surface after initial metal grinding steps, effectively removing scratches left by lower grits while beginning to develop clarity and surface smoothness. The heat-resistant phenolic resin bond and semi-flexible construction deliver consistent, efficient scratch removal on planetary and rotary floor grinders. Sold individually.

Key Benefits:

• Efficient scratch removal from lower grit passes
• Improves surface clarity and smoothness at the intermediate stage
• Durable heat-resistant phenolic resin bond engineered for dry polishing
• Semi-flexible construction for consistent contact across the floor surface
• Compatible with planetary and rotary floor grinders
• Reduces the need for repeated passes for faster intermediate polishing
• Dry use only — ideal where water is not available on the job site

Physical Properties:

• Grit: 300-400#
• Abrasive Material: Industrial-grade synthetic diamond
• Bond Type: Heat-resistant phenolic resin bond
• Pad Construction: Resin-impregnated diamond abrasive layer bonded to reinforced backing
• Flexibility: Semi-flexible
• Maximum Operating Speed: 3,000-4,000 RPM
• Operating Method: Dry use only
• Color: Yellow
• Coverage: 4,000-5,000 sq. ft. per set
• Packaging: Single piece

Limitations:

• Dry use only
• For use on concrete surfaces only
• Do not exceed the machine manufacturer's recommended RPM
• Avoid prolonged contact with strong acids, aggressive solvents, or highly alkaline solutions
• Excessive heat during prolonged polishing cycles can reduce resin bond life

How to Use:

1. Attach the pad to the grinder using the hook-and-loop (Velcro) backing system, ensuring the pad is centered and securely fastened to prevent wobbling
2. Start the grinder at the recommended RPM (typically 2,000-3,000 RPM depending on machine specifications)
3. Move the machine in overlapping passes across the floor for consistent coverage. Maintain even pressure and do not force the pad to cut faster as this can cause heat buildup and premature wear
4. Periodically stop and inspect the floor for uniform scratch removal and surface clarity
5. Remove excess dust with a vacuum or dry mop to maintain effective pad performance
6. Once the surface is refined, proceed to higher grit resin pads such as 800# or 1,500# for additional polishing and gloss development