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Pink Fused Alumina (PFA)

Pink Fused Alumina (PFA)

Pink Fused Alumina(PFA) is a high-performance abrasive material made by fusing high-quality alumina at high temperatures. Its pink color results from the unique composition and it is ideal for precision grinding, polishing, and coating applications.

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The main component of pink corundum is α-alumina, also called chromium corundum or ruby.

The main mineral composition is α-Al2O3-Cr2O3 solid solution.

The secondary mineral composition is a small amount of composite spinel (or no composite spinel) and refractory bricks with a chromium oxide content of 1% to 30%.

Chrome corundum uses aluminum oxide as the main raw material and is adapted to chromium oxide, etc. Made by smelting at high temperatures. It is pink in color, has a hardness similar to that of white corundum, and has higher toughness than white corundum. The abrasive tools made of it have good durability and high grinding finish. Suitable for precision grinding of measuring tools, machine tool spindles, instrument parts, threaded workpieces and template grinding.

Chemistry F12～F80 F90～F150 F180～F220
Low Chromium AL2O3 ≥98.5% ≥98.5% ≥98.0%
Cr2O3 0.20-0.45% 0.20-0.45% 0.20-0.45%
NA2O ≤0.50% ≤0.55% ≤0.60%
Medium Chromium AL2O3 ≥98.2% ≥98.2% ≥97.8%
Cr2O3 0.45-1.0% 0.45-1.0% 0.45-1.0%
NA2O ≤0.55% ≤0.60% ≤0.70%
High Chromium AL2O3 ≥97.4% ≥97% ≥96.5%
Cr2O3 1.0-2.0% 1.0-2.0% 1.0-2.0%
NA2O ≤0.55% ≤0.60% ≤0.70%
 
Basic minerals Crystal size Mohs hardness Nup hardness Melting point Proportion Bulk density Colour Crystal form
α-Al2O3 600-800 9 2200-2300 2050℃ 3.9-4.1g/cm3 1.40-1.91 Pink Polygonal shape
μm kg/cm3 g/cm3
 
Particle size range Low chromium Medium chromium High chromium
F12-F30 0.004 0.005 0.006
F36-F60 0.0036 0.0045 0.0055
F70-F120 0.0032 0.004 0.005
F150-F220 0.0028 0.0036 0.004

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