White Fused Alumina F Grit

White fused alumina is a premium abrasive made by arc fusion of high-purity alumina powder above 2000℃, followed by cooling and crystallization. It has a trigonal crystal system, a white or gray-white color, high microhardness, moderate toughness and good self-sharpening. Manufactured to FEPA standards, it is available as F grit for bonded abrasives and P grit for coated abrasives. Uniform particle-size distribution, high bulk density and good wettability support applications in bonded and coated abrasives, blasting, precision casting and refractories.

Product Parameters

Chemical Specifications

Grit: F8 F10 F14 F16 F20 F24 F30 F36 F40 F46 F54 F60 F70 F80 F90 F100 F120 F150 F180 F220 F240

Key Features

1. High purity and stable physical and chemical properties

White fused alumina contains ≥99.0% Al₂O₃ and ≤0.3% Na₂O, with very low impurity levels. High-temperature arc fusion produces a complete crystal structure, uniform chemistry and good batch consistency.

2. High hardness and excellent self-sharpening

Grains fracture during grinding to expose fresh edges, providing good self-sharpening and low grinding heat for finish grinding and polishing heat-sensitive stainless and hardened steels.

3. Grain shapes tailored to different applications

F grit: blocky or angular grains have high bulk density (1.75-1.95 g/cm³), impact resistance and good bond affinity. Suitable for vitrified and resin-bonded abrasive tools, blasting and precision casting.

P grit: needle-like or sharp-edged grains have lower bulk density (1.50-1.80 g/cm³), high sharpness and a narrower size distribution. Suitable for coated abrasives such as sandpaper and belts, with efficient grinding and good surface finish.

4. High cleanliness and low magnetic content

Magnetic separation minimizes magnetic contaminants and rust-spot contamination, supporting precision processing and electronic-grade applications requiring high cleanliness.

Process Overview

Process stage and description

Raw materials: high-purity alumina powder (Al₂O₃≥99.5%)

Fusion: electric arc furnace above 2000℃

Crystallization: natural cooling to form large crystals

Crushing and shaping: mechanical crushing followed by ball milling

Magnetic separation: high-intensity removal of magnetic impurities

Sizing: F grit F12-F220 / P grit P24-P320

Packaging: standard 25 kg lined woven bags or bulk bags

Typical Applications

Application areas and specific uses

Bonded abrasives: vitrified wheels, resin wheels, cut-off wheels, honing stones and mounted points for cylindrical, internal, surface, tool and form grinding

Coated abrasives: sandpaper, cloth, belts, sanding discs and flap discs for grinding and polishing metal, wood and painted surfaces

Blasting: rust, scale and burr removal from metals and surface preparation of glass, stone and ceramics

Precision casting: refractory fillers and shell sand for investment casting

Refractories: premium refractory products, castables and ramming mixes

Grinding and polishing: high-precision processing of semiconductors, optical lenses and precision instrument parts

Selection Guide

Packaging

Neutral or branded packaging is available on request.

Storage Recommendations

To maintain white fused alumina quality during storage, observe the following conditions:

Store in a cool, dry, ventilated warehouse away from direct sunlight. Relative humidity should preferably be ≤60% to prevent caking and mold on packaging.

Stack bags no more than 10 layers high to prevent packaging damage or grain fracture. Stack bulk bags one or two layers high and ensure stability. Use wooden or plastic pallets to keep products off the ground and protect against moisture.

Keep separate from acids, alkalis, organic solvents and other corrosive substances. Store different grit sizes separately with clear labels to prevent mixing.

Follow first-in, first-out (FIFO) stock rotation to avoid prolonged storage.

Shelf life is 3 years from manufacture under recommended conditions. After this period, retest key properties such as particle-size distribution and bulk density before use.

If packaging is damaged and material leaks, replace the packaging and seal the recovered material. Moisture-caked abrasive may be dried and sieved, but its performance must be retested before use.