SPX Abrasives · Technical performance

The measurements
behind the disc.

SPX Abrasives grinding performance test. Material removal, abrasive loading and surface finish, measured under controlled laboratory conditions.

Explore the test results

Tested disc

6 in · 15 holes
Yellow film · Ceramic

Hook & loop backing
P80 / P120 / P180 / P240 / P320 / P400 / P500 / P1200

Test date: 15 June 2026

Grits tested: 8
Recorded specimens: 16
Grinding per specimen: 15 min
Measurement categories: 3

01 / Performance overview

SPX Abrasives testing charts

Two specimens were recorded for each grit. Each chart shows the individual measurements from the test, with exact values alongside every bar.

SPX Abrasives testing chart

Material removal (g)

Total aluminium removed across three five-minute cycles.

Specimen #1Specimen #2

P80

4.8679

4.8983

P120

4.2490

4.4867

P180

3.6299

3.6466

P240

3.0729

3.1012

P320

2.4872

2.5486

P400

2.2959

2.3308

P500

1.4237

1.4747

P1200

0.3108

0.3003

Higher values indicate more material removed under the recorded test conditions.

SPX Abrasives testing chart

Dust retained on abrasive (g)

Total dust retained on the sanding disc across the three cycles.

Specimen #1Specimen #2

P80

0.0210

0.0316

P120

0.0534

0.0585

P180

0.0671

0.0612

P240

0.0638

0.0824

P320

0.0517

0.0409

P400

0.0343

0.0442

P500

0.0189

0.0225

P1200

0.0094

0.0072

Lower values indicate less retained dust. This measures abrasive loading, rather than airborne dust or extraction efficiency.

SPX Abrasives testing chart

Surface roughness · Ra (µm)

Workpiece surface roughness measured after grinding.

Specimen #1Specimen #2

P80

1.351

1.541

P120

1.301

1.187

P180

0.808

0.741

P240

0.611

0.722

P320

0.563

0.574

P400

0.369

0.355

P500

0.272

0.248

P1200

0.176

0.162

Lower Ra indicates a finer surface finish. Rz and Rmax measurements are included in the full results.

All specimens were tested on aluminium under the same recorded conditions. The charts compare grit sizes and specimens within the SPX disc test.

View every recorded measurement

02 / Conditions & method

How the discs were tested

Controlled test conditions

Disc: 6 in yellow film sanding disc
Backing / hole pattern: Hook & loop / 15 holes
Abrasive material: Ceramic abrasive
Workpiece: Aluminium plate, 150 × 100 × 5 mm
Test machine: Automatic polishing machine
Machine action: Pneumatic grinder / rotary vibration
Grinding pressure: 17 N
Machine speed: 9,000 rpm
Ambient temperature: 25°C
Ambient humidity: 68% RH
Test duration: 3 × 5-minute cycles per specimen
Samples: 2 specimens per grit / 16 specimens total

Testing procedure

Mount the disc
Affix the sample sanding disc to the grinding disc.
Secure the workpiece
Clamp the aluminium plate in the automatic polishing machine fixture.
Run the grinding program
The machine follows the workpiece profile with reciprocating X/Y-axis motion at the recorded pressure and speed. Each grinding cycle lasts five minutes.
Remove and clean
Remove the workpiece and abrasive after grinding and carry out the recorded cleaning procedure.
Measure the results
Weigh the workpiece mass loss and dust retained on the abrasive, then measure workpiece surface roughness.

03 / Full test record

Every grit. Every measurement.

All numerical measurements are reproduced exactly as supplied. Material removal and retained dust are in grams (g); surface roughness is in micrometres (µm).

On smaller screens, scroll each table horizontally to see both specimens for every grit.

Coarse to medium grit / P80 · P120 · P180

SPX Abrasives coarse to medium grit measurements. Each cycle is five minutes; totals cover three cycles.
Measurement	P80Specimen #1	P80Specimen #2	P120Specimen #1	P120Specimen #2	P180Specimen #1	P180Specimen #2
Material removal · cycle 1 / 5 min (g)	1.7390	1.6945	1.4959	1.5861	1.2760	1.3041
Material removal · cycle 2 / 5 min (g)	1.5949	1.6179	1.4314	1.4666	1.2208	1.2450
Material removal · cycle 3 / 5 min (g)	1.5340	1.5859	1.3217	1.4340	1.1331	1.0975
Total material removal (g)	4.8679	4.8983	4.2490	4.4867	3.6299	3.6466
Dust retained · cycle 1 (g)	0.0092	0.0124	0.0186	0.0207	0.0232	0.0241
Dust retained · cycle 2 (g)	0.0067	0.0117	0.0193	0.0172	0.0274	0.0194
Dust retained · cycle 3 (g)	0.0051	0.0075	0.0155	0.0206	0.0165	0.0177
Total dust retained (g)	0.0210	0.0316	0.0534	0.0585	0.0671	0.0612
Surface roughness · Ra (µm)	1.351	1.541	1.301	1.187	0.808	0.741
Surface roughness · Rz (µm)	10.441	10.946	8.213	7.606	6.197	5.647
Surface roughness · Rmax (µm)	12.715	13.607	11.164	12.628	7.889	6.451

Medium to fine grit / P240 · P320 · P400

SPX Abrasives medium to fine grit measurements. Each cycle is five minutes; totals cover three cycles.
Measurement	P240Specimen #1	P240Specimen #2	P320Specimen #1	P320Specimen #2	P400Specimen #1	P400Specimen #2
Material removal · cycle 1 / 5 min (g)	1.1235	1.1341	0.8988	0.9131	0.8338	0.8448
Material removal · cycle 2 / 5 min (g)	0.9847	0.9900	0.7968	0.8296	0.7431	0.7489
Material removal · cycle 3 / 5 min (g)	0.9647	0.9771	0.7916	0.8059	0.7190	0.7371
Total material removal (g)	3.0729	3.1012	2.4872	2.5486	2.2959	2.3308
Dust retained · cycle 1 (g)	0.0224	0.0294	0.0197	0.0156	0.0112	0.0125
Dust retained · cycle 2 (g)	0.0207	0.0243	0.0163	0.0145	0.0143	0.0148
Dust retained · cycle 3 (g)	0.0207	0.0287	0.0157	0.0108	0.0088	0.0169
Total dust retained (g)	0.0638	0.0824	0.0517	0.0409	0.0343	0.0442
Surface roughness · Ra (µm)	0.611	0.722	0.563	0.574	0.369	0.355
Surface roughness · Rz (µm)	5.298	4.798	4.938	3.471	3.289	2.751
Surface roughness · Rmax (µm)	6.290	6.487	5.580	5.428	4.583	3.453

Fine finishing / P500 · P1200

SPX Abrasives fine finishing measurements. Each cycle is five minutes; totals cover three cycles.
Measurement	P500Specimen #1	P500Specimen #2	P1200Specimen #1	P1200Specimen #2
Material removal · cycle 1 / 5 min (g)	0.5367	0.5579	0.1142	0.1081
Material removal · cycle 2 / 5 min (g)	0.4471	0.4674	0.0994	0.0969
Material removal · cycle 3 / 5 min (g)	0.4399	0.4494	0.0972	0.0953
Total material removal (g)	1.4237	1.4747	0.3108	0.3003
Dust retained · cycle 1 (g)	0.0056	0.0072	0.0028	0.0029
Dust retained · cycle 2 (g)	0.0063	0.0081	0.0034	0.0023
Dust retained · cycle 3 (g)	0.0070	0.0072	0.0032	0.0020
Total dust retained (g)	0.0189	0.0225	0.0094	0.0072
Surface roughness · Ra (µm)	0.272	0.248	0.176	0.162
Surface roughness · Rz (µm)	1.659	2.112	1.491	1.230
Surface roughness · Rmax (µm)	2.170	2.943	1.823	1.776

Reading these results

Material removal measures workpiece mass loss. Retained dust measures abrasive loading. Ra, Rz and Rmax describe the resulting workpiece surface roughness, with lower values indicating a finer finish.

This SPX Abrasives test record presents laboratory data supplied by our manufacturing partner. Results apply to the tested disc and aluminium workpiece under the stated conditions; performance on other materials and equipment can vary. The report records measurements without a pass/fail assessment.

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Measurement

P80Specimen #1

P80Specimen #2

P120Specimen #1

P120Specimen #2

P180Specimen #1

P180Specimen #2

Material removal · cycle 1 / 5 min (g)

1.7390

1.6945

1.4959

1.5861

1.2760

1.3041

Material removal · cycle 2 / 5 min (g)

1.5949

1.6179

1.4314

1.4666

1.2208

1.2450

Material removal · cycle 3 / 5 min (g)

1.5340

1.5859

1.3217

1.4340

1.1331

1.0975

Total material removal (g)

4.8679

4.8983

4.2490

4.4867

3.6299

3.6466

Dust retained · cycle 1 (g)

0.0092

0.0124

0.0186

0.0207

0.0232

0.0241

Dust retained · cycle 2 (g)

0.0067

0.0117

0.0193

0.0172

0.0274

0.0194

Dust retained · cycle 3 (g)

0.0051

0.0075

0.0155

0.0206

0.0165

0.0177

Total dust retained (g)

0.0210

0.0316

0.0534

0.0585

0.0671

0.0612

Surface roughness · Ra (µm)

1.351

1.541

1.301

1.187

0.808

0.741

Surface roughness · Rz (µm)

10.441

10.946

8.213

7.606

6.197

5.647

Surface roughness · Rmax (µm)

12.715

13.607

11.164

12.628

7.889

6.451

Measurement

P240Specimen #1

P240Specimen #2

P320Specimen #1

P320Specimen #2

P400Specimen #1

P400Specimen #2

Material removal · cycle 1 / 5 min (g)

1.1235

1.1341

0.8988

0.9131

0.8338

0.8448

Material removal · cycle 2 / 5 min (g)

0.9847

0.9900

0.7968

0.8296

0.7431

0.7489

Material removal · cycle 3 / 5 min (g)

0.9647

0.9771

0.7916

0.8059

0.7190

0.7371

Total material removal (g)

3.0729

3.1012

2.4872

2.5486

2.2959

2.3308

Dust retained · cycle 1 (g)

0.0224

0.0294

0.0197

0.0156

0.0112

0.0125

Dust retained · cycle 2 (g)

0.0207

0.0243

0.0163

0.0145

0.0143

0.0148

Dust retained · cycle 3 (g)

0.0207

0.0287

0.0157

0.0108

0.0088

0.0169

Total dust retained (g)

0.0638

0.0824

0.0517

0.0409

0.0343

0.0442

Surface roughness · Ra (µm)

0.611

0.722

0.563

0.574

0.369

0.355

Surface roughness · Rz (µm)

5.298

4.798

4.938

3.471

3.289

2.751

Surface roughness · Rmax (µm)

6.290

6.487

5.580

5.428

4.583

3.453

Measurement

P500Specimen #1

P500Specimen #2

P1200Specimen #1

P1200Specimen #2

Material removal · cycle 1 / 5 min (g)

0.5367

0.5579

0.1142

0.1081

Material removal · cycle 2 / 5 min (g)

0.4471

0.4674

0.0994

0.0969

Material removal · cycle 3 / 5 min (g)

0.4399

0.4494

0.0972

0.0953

Total material removal (g)

1.4237

1.4747

0.3108

0.3003

Dust retained · cycle 1 (g)

0.0056

0.0072

0.0028

0.0029

Dust retained · cycle 2 (g)

0.0063

0.0081

0.0034

0.0023

Dust retained · cycle 3 (g)

0.0070

0.0072

0.0032

0.0020

Total dust retained (g)

0.0189

0.0225

0.0094

0.0072

Surface roughness · Ra (µm)

0.272

0.248

0.176

0.162

Surface roughness · Rz (µm)

1.659

2.112

1.491

1.230

Surface roughness · Rmax (µm)

2.170

2.943

1.823

1.776

The measurementsbehind the disc.

SPX Abrasives testing charts

Material removal (g)

Dust retained on abrasive (g)

Surface roughness · Ra (µm)

How the discs were tested

Controlled test conditions

Testing procedure

Mount the disc

Secure the workpiece

Run the grinding program

Remove and clean

Measure the results

Every grit. Every measurement.

Coarse to medium grit / P80 · P120 · P180

Medium to fine grit / P240 · P320 · P400

Fine finishing / P500 · P1200

Reading these results

Find the disc for your next job.

The measurementsbehind the disc.

SPX Abrasives testing charts

Material removal (g)

Dust retained on abrasive (g)

Surface roughness · Ra (µm)

How the discs were tested

Controlled test conditions

Testing procedure

Mount the disc

Secure the workpiece

Run the grinding program

Remove and clean

Measure the results

Every grit. Every measurement.

Coarse to medium grit / P80 · P120 · P180

Medium to fine grit / P240 · P320 · P400

Fine finishing / P500 · P1200

Reading these results

Find the disc for your next job.

The measurements
behind the disc.

The measurements
behind the disc.