Between two polishing passes, a resin-bond pad carries paste, dust, water and densifier or sealer residue. It is not ready for the next grit until cleaned, opened where glazed, and dried so its bond grips the diamond.

A pad returned straight to the holder after one pass often leaves a smeared film instead of a clean cut line. Under 300–500 lux of oblique light that smear reads as haze or a scratch visible only at gloss inspection.

Why Pad Conditioning Matters Between Passes

A resin bond holds diamond at the surface through a controlled wear rate: as resin wears, new diamond emerges. Loading clogs the face with cuttings and residue that block the diamonds; cleaning removes it.

Skipping either step is the most common reason a new pad underperforms from its first hour. A clean but glazed face still cuts slowly, while a dressed but loaded face spreads paste across the pockets and repeats grit marks into the next stage.

Signals That a Pad Needs Conditioning

Inspect the pad face and floor after each pass. Most signals appear within the first 10–15 m² of the next pass, so checking at the end of a pass beats finding the problem halfway through the next grit. The observations below trigger a stop before the grit sequence advances.

• The face carries a dull grey or white paste layer, especially around segment outlets
• The machine whines or drags, with vibration through the handle instead of a steady
• Streaks and patches remain; the pad leaves a wet smear that dries hazy rather than a
• Cutting rate drops 20% or more versus the previous pass on the same hardness, weight
• Adjacent areas differ by more than 15 gloss units under oblique light, or reflect a

None of these signals means the pad is worn out. Moving a loaded pad from 400 to 800 grit drags coarser paste into the finer cut, and those marks reappear at 1500 and 3000 grit, where removal costs extra passes.

Cleaning Paste, Slurry and Densifier Residue

Clean with the pad in the holder or laid flat. Brush the face with a stiff nylon or brass hand brush under running water, working residue out of the pockets. Use a neutral pH cleaner at label dilution for densifier or sealer residue; dense lithium may need a 3–5 minute dwell.

Rinse until runoff is clear and a towel wipe leaves no transfer. Wet-system pads are rinsed under the tap; hybrid dry pads are brushed and blown with air at 0.4–0.6 MPa, not soaked. Slurry under the plate causes rocking, so wipe the channels each time.

Deglazing and Opening the Diamond Face

Opening follows cleaning and applies only when the resin face is smooth and shiny rather than filled with paste. The goal is a thin, even fresh face exposing the top row of diamonds without removing measurable thickness.

The opening pass lasts 15–45 seconds at lower travel than a polishing pass, on hard concrete or a dressing brick. Over-opening wastes pad: dressed over a minute at full weight, the pad drops diamond faster and scratches wider.

Drying and Re-inspection Before Refitting

A cleaned pad goes back wet only in a wet-polishing system. Dry and hybrid pads must air-dry before reinstallation, since a wet face cuts slower and can slip in the channels. Drying is 10–20 minutes at 20–25 ℃; above RH 75–80% allow 30–40 minutes or a fan dry.

Conditioning Parameters by Grit Stage

The table sets the typical conditioning window across the resin grit sequence used on polished concrete. Values are starting ranges for standard floor machines; adjust to concrete hardness, machine weight and the supplied bond grade.

Checklist and Common Mistakes

• Inspect the pad at the end of every pass, before moving to the next grit; do not wait
• Clean before opening: dry brushing a glazed face spreads paste across the diamond
• Keep dressing under 45 seconds at reduced pressure; full-weight opening removes
• Record thickness and hours per pad, and order stock in the grits that wear out
• Store cleaned, dry pads flat in the grit stack; never hang wet pads or stack them

Frequent mistakes are conditioning the wrong problem: dressing a loaded pad instead of cleaning it, soaking a hybrid pad meant for dry use, or forcing a glazed pad back without checking that diamond is still present.

Retirement Cues and Procurement Benchmark

Conditioning restores the cutting face; it cannot restore diamond worn below the resin level or spent thickness. Retire a pad when no fresh diamond appears after two opening passes, thickness is below the runout limit, or the backing separates.

Compare conditioning cost against remaining life when buying consumables. A pad serviced five or six times should reach its rated square-metre figure; a small spare stock of working grits means a failed inspection leads to a swap rather than a rushed service.