High hardness and sharp grinding performance
Garnet powder (Mohs hardness 7.5-8.0) has a hardness close to that of corundum. Its particles are broken many times to form sharp corners and tough edges, which can efficiently cut the glass surface, improve polishing efficiency and reduce the risk of surface scratches4610. For example, in the polishing of precision glass such as TV screens and optical lenses, high finish requirements can be achieved13.
Low breakage rate and recyclability
Thanks to the high toughness of iron aluminum garnet, garnet powder has a low breakage rate during polishing and can be recycled 5-10 times, significantly reducing long-term costs4610.
Low pollution and environmental protection
No free silicon and heavy metals: does not contain silica dust, avoids the risk of silicosis, and complies with international safety standards such as ISO 1112646;
Low dust: high specific gravity (4.2 g/cm³), fast sedimentation, and 6-pass water washing process, the working environment is cleaner410.
Thermal stability and chemical inertness
The melting point is above 1300℃, it is resistant to acid and alkali corrosion, does not cause thermal damage during polishing, and protects the integrity of the glass structure3910.
🧪 2. Specific application scenarios
Precision optical devices
Such as camera lenses, microscope lenses, semiconductor glass substrates, etc., garnet powder (particle size W5-W40) can achieve submicron surface roughness310.
Electronic display panels
Polishing of large-area glass such as TV screens and mobile phone covers, using its uniform particle size distribution to avoid scratches15.
Special process treatment
Glass frosting etching: used for surface treatment of artistic glass and architectural decorative glass17;
Deburring and repair: repair glass edge chipping or mold marks56.
⚠️ III. Precautions for use
Particle size selection
Rough polishing (high-efficiency material removal): select 100-240 mesh (such as FEPA F240-F360)29;
Fine polishing (high finish): W28-W5 (about JIS#1500-#3000) ultra-fine particle size310 is recommended.
Process coordination
Coolant (such as deionized water) is required to control the temperature and rinse the debris4;
In sandblasting polishing, the pressure must be lower than 0.6MPa to prevent glass breakage6.
Comparison of alternative solutions
Compared with corundum or silicon carbide, garnet micropowder is cheaper and more environmentally friendly, but its hardness is slightly lower than diamond. Ultra-precision polishing may require the combination of other abrasives57.
Garnet micropowder is an ideal choice for glass polishing due to its high hardness, low pollution and strong toughness, especially for precision fields such as optical devices and electronic screens. Reasonable selection of particle size and control of process parameters can achieve efficient and low-cost polishing effects.