I. Basis for selecting alumina / white fused alumina grades
- Coarser particles deliver better abrasion resistance but reduce the transparency of melamine paper.
- Finer particles offer relatively lower abrasion resistance while significantly improving paper transparency.
II. Commonly used alumina & white fused alumina grades for abrasion-resistant applications
| Grade Specification | Coarseness Classification & Application |
|---|---|
| F150, F180, F220 (150#, 180#, 220#) | Regular sized abrasive grains, mainly used for heavy-duty wear-resistant paper for industrial factory floors |
| F240, F280, F320, W63, W50, W40 (240#, 280#, 320#, 360#, 400#) | Dominantly applied for residential laminate flooring |
| 4000#, 6000#, 8000# | Ultra-fine powder for high-transparency integrated wear-resistant paper, ideal for tabletops and wardrobe panels |
III. Scenario-specific grade selection (directly applicable to factory production)
(1) Independent wear-resistant overlay paper (exclusively for flooring)
Household laminate flooring (33 g/㎡, 45 g/㎡ alumina wear-resistant overlay paper)
First choice: 320#, D50: 45~53 μm
Merits: Abrasion resistance above 600 revolutions, moderate transparency, distinct wood grain without surface haze, excellent cost-effectiveness.
For light-colored or high-gloss flooring: upgrade to F240 (360#, D50: 35~45 μm) to mitigate surface whitening and fogging.
High-traffic commercial flooring for shopping malls (62 g/㎡, 76 g/㎡ high-weight wear-resistant paper)
First choice: 240#, D50: 53~75 μm
Larger particles provide strong anti-abrasion capacity against sand and heavy friction, achieving 9000–18000 abrasion revolutions.
For extra heavy-duty wear-resistant flooring: F150 (180#, D50: 75~90 μm). Use cautiously, as it tends to cause whitening and cover decorative grain patterns.
(2) Integrated wear-resistant oil-proof melamine paper (cabinet doors, countertops, tabletops)
Standard integrated wear-resistant cabinet doors (target abrasion resistance: 2000~4000 revolutions)
Recommended grades: 800#, 1000#, 1200#, D50: 10~20 μm
Uniform dispersion inside melamine resin, no wood grain masking or gray discoloration on solid-color surfaces, balancing oil resistance and scratch resistance.
Premium soft-touch / high-gloss countertops and laboratory worktops
Recommended grades: 4000#, 6000#, 8000#, D50: 2~5 μm
Optimal transparency, smooth and flat surface free of protruding particles, no pits or pinholes after hot pressing.
IV. Five core principles for particle size selection
Higher abrasion resistance demand needs coarser particle size
Coarse particles embed deeper in resin matrix for stronger friction and abrasion resistance; fine particles have limited maximum wear resistance, suited for low-wear occasions.
Lighter patterns or higher transparency requirements require finer particle size
Coarse alumina triggers light scattering due to refractive index difference, easily forming hazy fog on light-colored or white wood grain surfaces.
Higher alumina loading dosage generally matches finer particle size
High addition of coarse powder easily leads to sedimentation, agglomeration and granular bumps on paper surface; fine powder possesses better suspension stability in resin.
- Match particle size with impregnation process
- Dry powder spraying process: moderately coarse grades (F180 / F220) are acceptable for good particle adhesion.
- In-resin blending for one-step impregnation: ultra-fine powder is mandatory to prevent coating roller clogging, resin stratification and precipitation.
- Adaptability to hot pressing process
Excessively coarse particles may puncture resin film or crush base paper under high-temperature hot pressing; fine particles feature better flexibility and higher finished product yield after