Test Summary
Report No.: KAIYI-TR-20261014-034 | Test Date: October 14, 2026 | Test Location: KAIYI Factory Workshop, Quanzhou, Fujian, China
Conducted by: KAIYI Technical Team (Test Operator: Alex Chen, Senior Abrasive Technician; Technical Review & Approval: Wen Guo, Technical Lead)
Test Statement: In an internal factory test on a granite slab, KAIYI 4-inch wet diamond polishing pads (Model 34) reached 94 GU after progressive S0–S4 polishing at 2,800 RPM with continuous water cooling. This met the internal acceptance requirement of ≥85 GU. Result: PASS.
Note: This report documents an internal workshop test under stated conditions, not an independent laboratory certification. Actual jobsite results vary with stone mineral composition, initial surface roughness, water flow, machine speed, and operator technique.
Test Information: 4 Inch Granite Polishing Pads
| Manufacturer | Diamond Pads Factory / KAIYI (Quanzhou Kaiyi Industry & Trade Co., Ltd) |
| Product | Diamond resin-bond stone polishing pad set |
| Sample Model | KAIYI-DPF-CUST-34 (Model 34) |
| Pad Diameter | 4 inch / 100 mm (3.0 mm wear layer) |
| Test Sequence | 5-piece set: S0, S1, S2, S3, S4 |
| Substrate & Source | Natural Granite Slab (China Black Granite standard), nominal Mohs hardness 6.5–7.0, slab thickness 100 mm |
| Polishing Mode | Wet polishing with continuous water cooling (water flow ~2.5 L/min) |
| Operating Equipment | Variable-speed wet polisher operated at 2,800 RPM |
| Measuring Instrument | 3nh precision 60° digital gloss meter (calibrated to ISO 2813 / ASTM D523 standard) |
| Sampling Protocol | 5-point surface grid (4 perimeter quadrants + 1 center coordinate; arithmetic mean recorded) |
| Test Temperature | 27°C |
Sequence Identification: S0–S4 are factory stage designations for this custom 5-step granite set. S0 provides initial leveling and prep, followed by progressive refinement stages S1 through S4.
Photo: S0, S1, S2, S3, S4 Pad Details
Test Objective
- Verify the cutting and polishing performance of this 5-step pad set on hard granite.
- Measure final surface gloss after progressive wet polishing from S0 to S4.
- Check whether the polished surface shows burn marks, glazing, or unremoved scratches.
- Provide reference test data for B2B buyers and OEM evaluation.
Test Method
The granite slab was clamped securely on the workbench. Pads were used in sequential order without skipping steps: S0 → S1 → S2 → S3 → S4.
🎬 On-Site Test Video: Granite Wet Polishing & 94 GU Gloss Measurement
| Stage | Process Purpose | Target Surface Condition |
|---|---|---|
| S0 | Initial grinding / leveling | Remove saw marks and establish a uniform flat base |
| S1 | Coarse grinding | Refine initial scratch pattern |
| S2 | Medium honing | Produce a smooth, uniform matte surface |
| S3 | Pre-polishing | Close stone pores and prepare surface for gloss |
| S4 | Final polishing | Develop final high-gloss finish |
Continuous water was supplied through the polisher to cool the resin bond and flush slurry. After the final step, the surface was cleaned and dried before gloss measurement.
Gloss Measurement Results
Surface gloss was measured with a calibrated 60° digital gloss meter (3nh precision gloss meter) in accordance with ISO 2813 and ASTM D523 after complete surface drying following S4 final polish.
| Test Coordinate | Measurement Point | Observed Gloss (GU) | Acceptance Baseline |
|---|---|---|---|
| Point 1 | Top-Left Quadrant | 93.8 GU | ≥ 85 GU |
| Point 2 | Top-Right Quadrant | 94.2 GU | ≥ 85 GU |
| Point 3 | Geometric Center | 94.5 GU | ≥ 85 GU |
| Point 4 | Bottom-Left Quadrant | 93.6 GU | ≥ 85 GU |
| Point 5 | Bottom-Right Quadrant | 94.0 GU | ≥ 85 GU |
| Average (Mean) | Overall Slab Finish | 94.02 GU (Reported: 94 GU) | Result: PASS |
Measurement detail: All five sample points consistently exceeded the ≥85 GU threshold with a standard deviation of <0.4 GU, indicating a mirror-grade, ripple-free optical surface.
Evaluation Summary
| Evaluation Item | Requirement | Observed Result | Verdict |
|---|---|---|---|
| Final gloss at S4 | ≥ 85 GU | 94 GU | Pass |
| Sequential workflow | No skipped stages | S0 through S4 used in order | Pass |
| Surface condition | No burn marks or coarse scratches | Uniform finish under test conditions | Pass |
| Water cooling | Continuous water flow | Maintained throughout test | Pass |
Summary Verdict: PASS. The custom 5-step pad set completed the full workflow from initial grinding to final polishing on granite, reaching 94 GU under the documented conditions.
Recommended Practices for Granite Wet Polishing
- Maintain continuous, moderate water flow to flush slurry and prevent pad glazing.
- Operate between 2,500 and 3,200 RPM; do not exceed 4,500 RPM.
- Apply steady, even pressure without tilting the pad edges.
- Rinse the stone surface between steps to prevent coarse abrasive residue from carrying over.
- Pair with a flexible rubber backer pad when polishing curved edges or sink cutouts.
Frequently Asked Questions (FAQ)
What gloss level is considered high for granite?
In stone fabrication, 80–85 GU is considered standard commercial finish, while 90+ GU represents high-gloss clarity. In this test, Model 34 reached 94 GU on the tested granite slab.
Can steps be skipped to save time?
Skipping steps is not recommended. Each progressive step removes scratches from the previous pad. Skipping steps often leaves scratches that fine pads cannot remove efficiently.
What causes pad glazing on granite?
Insufficient water supply and excessive machine speed are the primary causes. Continuous water flow keeps diamond cutting edges clean and exposed.
Do you offer sample packs for testing?
Yes. Commercial sample packs can be ordered directly from our Model 34 product page, and the sample cost is credited toward your first qualifying bulk order. Custom specifications, private-label branding, and tailored resin formulations are fully supported for B2B wholesale orders.
B2B Wholesale & Factory Sampling
Diamond Pads Factory manufactures diamond abrasives in Quanzhou, China. Standard options include the 4" 5-step diamond polishing pads for granite (Model 34) tested here, standard 7-step wet sets, and metal grinding discs in our KAIYI granite polishing pads collection.
- Stock Wholesale MOQ: 100 pcs per step (air express shipping available).
- OEM Manufacturing: Custom Velcro branding, formulation adjustment, and packaging for distributors (MOQ: 500–1,000 pcs).
- Technical Guide: Read our Granite Polishing Guide → for step-by-step recommendations.
- Related Buyer's Guide: Compare grit progressions in our Diamond Polishing Pad Buyer's Guide (2026 Edition).
- Industrial Selection: Review factory parameters in our Industrial Selection Guide: Granite vs Engineered Stone.
- Product Catalog: Explore all grain sizes and tooling in our Wet Diamond Polishing Pads Collection.
Contact us with your stone material, machinery, and quantity requirements for direct factory quotes and test samples.
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